Accessory Feature Patents (Class 360/125.3)
  • Patent number: 10847183
    Abstract: A magnetic disk device includes a disk, a head comprising a main magnetic pole and a write shield, and configured to generate a magnetic field from the main magnetic pole to the write shield to write data onto the disk, an assist element configured to assist the writing by generating a magnetic field or heating a surface of the disk, and a controller configured to control the head to write the data according to either a first recording method using the assist element or a second recording method not using the assist element depending on a condition of the assist element.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: November 24, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Yusuke Tomoda
  • Patent number: 10839832
    Abstract: A microwave assisted magnetic recording (MAMR) write head includes a main pole and a trailing shield. A spin torque oscillator device is disposed between the main pole and the trailing shield. The spin torque oscillator device includes a free layer. A trailing shield hot seed layer is disposed between the spin torque oscillator device and the trailing shield. The trailing shield hot seed layer includes a magnetic material doped with a rare earth element. In certain embodiments, the trailing shield hot seed layer includes the rare earth element in an atomic percent content from about 2% to about 10% atomic percent. In certain embodiments, the trailing shield hot seed layer has an intrinsic damping from about 0.02 to about 0.2.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: November 17, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden
  • Patent number: 10839828
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the trailing shield and the main pole. The structure includes one or more layers and a seed layer. The seed layer is connected to one or more electrical leads to provide an electrical path from the leads to the one or more layers during operation. The seed layer guides the electrical current to the one or more layers and improves heat dissipation of the one or more layers, leading to a reduction in hot spots formed in the one or more layers.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: November 17, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Quang Le, Hongquan Jiang, Michael Kuok San Ho
  • Patent number: 10762918
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a trailing shield, a main pole, a MAMR stack disposed between the trailing shield and the main pole, side shields surrounding at least a portion of the main pole, and a structure disposed between the side shields and the main pole at a media facing surface (MFS). The structure is fabricated from a material that is thermally conductive and electrically insulating/dissipative. The material has a thermal conductivity of at least 50 W/(m*K) and an electrical resistivity of at least 105 ?*m. The structure helps dissipate joule heating generated from either the main pole or the MAMR stack into surrounding area without electrical shunting, leading to reduced heating or break-down induced failures.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: September 1, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Quang Le, Hongquan Jiang, Ning Shi, Alexander M. Zeltser
  • Patent number: 10741202
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: August 11, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Michael Kuok San Ho, Yunfei Ding, Zhigang Bai, Yaguang Wei, Terence Lam, Goncalo Baiao de Albuquerque, Xinjiang Shen, Feng Q. Liu
  • Patent number: 10734017
    Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: August 4, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoyuki Narita, Hirofumi Suto, Tomoyuki Maeda
  • Patent number: 10546600
    Abstract: According to one embodiment, a magnetic head includes a main pole, a write shield magnetic pole opposed to the main pole with a write gap, and a high-frequency oscillator provided between the main pole and the write shield magnetic pole within the write gap. The main pole includes a shield-side end surface opposing the write shield magnetic pole with the write gap and brought into contact with the high frequency oscillator. The high-frequency oscillator has a width in a cross-track direction, in an air bearing surface, greater than a width of the shield-side end surface in the cross-track direction. The high-frequency oscillator is disposed to extend over at least one end edge of the shield-side end surface in the cross-track direction to an outer side of the main pole.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: January 28, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Gaku Koizumi, Masaya Ohtake
  • Patent number: 10490210
    Abstract: A PMR writer is disclosed with a leading shield in which a lower (LS2) layer, a middle LS1 layer, and an upper leading edge taper (LET) layer have a damping parameter?0.04, and extend from an air bearing surface (ABS) to a first height (h1) from the ABS. The LS2 layer has a notch filled with dielectric material at the air bearing surface (ABS) that extends to a height?h1, or may be completely replaced with dielectric material. Two notch front sides each form an angle ? with the LS1 bottom surface, and two notch inner sides between the ABS and LS2 backside form angle ? with the ABS where each of ? and ? is from 10 degrees to 170 degrees. Accordingly, bits per square inch performance is improved while substantially maintaining tracks per square inch capability for an overall gain in area density capability.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: November 26, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yue Liu, Kei Hirata, Yuhui Tang
  • Patent number: 10460752
    Abstract: A magnetic recording write head and system has a spin-torque oscillator (STO) located between the write head's write pole and trailing shield. The STO's ferromagnetic free layer is located near the write pole with a multilayer seed layer between the write pole and the free layer. The STO's nonmagnetic spacer layer is between the free layer and the STO's ferromagnetic polarizer. The polarizer may be the trailing shield of the write head or a separate polarizer layer. The STO electrical circuitry causes electron flow from the write pole to the trailing shield. The multilayer seed layer removes the spin polarization of electrons from the write pole, which enables electrons reflected from the polarizer layer to become spin polarized, which creates the spin transfer torque on the magnetization of the free layer. The multilayer seed layer includes Mn or a Mn-alloy layer between one or more metal or metal alloy films.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: October 29, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Zheng Gao, Masahiko Hashimoto, Sangmun Oh
  • Patent number: 10446175
    Abstract: A spin transfer torque (STT) device is formed on an electrically conductive substrate and includes a ferromagnetic free layer near the substrate, a ferromagnetic polarizing layer and a nonmagnetic spacer layer between the free layer and the polarizing layer. A multilayer structure is located between the substrate and the free layer. The multilayer structure includes a metal or metal alloy seed layer for the free layer and an intermediate oxide layer below and in contact with the seed layer. The intermediate oxide layer reflects spin current from the free layer and thus reduces undesirable damping of the oscillation of the free layer's magnetization by the seed layer.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 15, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Susumu Okamura, Masahiko Hashimoto, Zheng Gao
  • Patent number: 10438618
    Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: October 8, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoyuki Narita, Tomoyuki Maeda
  • Patent number: 10424326
    Abstract: A spin torque transfer (STT) assisted magnetic recording structure is disclosed wherein a magnetic flux guiding (MFG) device is formed between a main pole (MP) trailing side and a trailing shield (TS). The MFG device has a field generation layer (FGL) separated from first and second spin polarization (SP) layers by first and second non-magnetic layers, respectively. First and second SP layers have magnetizations in opposite directions so that when a direct current of sufficient magnitude is applied from the MP to TS, or from the TS to MP in other embodiments, FGL magnetization flips to a direction toward the MP and opposes a write gap field flux thereby enhancing the write field. Additive torque from two SP layers on the FGL enables lower current density for FGL flipping or a greater degree of FGL flipping at a given current density compared with MFG schemes having a single SP layer.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: September 24, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Wenyu Chen, Shohei Kawasaki, Tetsuya Roppongi, Yan Wu
  • Patent number: 10403311
    Abstract: A recording head that includes a bearing surface and a write pole having a front surface that forms a portion of the bearing surface. The recording head also includes a side shield for the write pole. The side shield includes a low saturation magnetization cap layer having a front surface that forms a portion of the bearing surface. The side shield also includes a main side shield layer having a saturation magnetization that is higher than a saturation magnetization value of the low saturation magnetization cap layer.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: September 3, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Swaraj Basu, Prim Gangmei, Angela Moore, Mark Anthony Gubbins, Beverley R. McConnell
  • Patent number: 10347276
    Abstract: A method is disclosed for forming a perpendicular magnetic recording writer with an all wrap around (AWA) shield design wherein one or more of the leading shield, trailing shield, and side shields are a composite wherein a magnetic “hot seed” layer made of a >19 kG to 24 kG material adjoins a gap layer, and a side of the hot seed layer opposite the gap layer adjoins a high damping magnetic layer made of a 10-16 kG material (or a 16-19 kG material in the trailing shield) having a Gilbert damping parameter ?>0.04. In one embodiment, the high damping magnetic layer is FeNiRe with a Re content of 3 to 15 atomic %. The main pole leading and trailing sides may be tapered. Side shields may have a single taper or dual taper structure. Higher writer speed with greater areal density capability is achieved.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: July 9, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Yaguang Wei, Jiun-Ting Lee
  • Patent number: 10311901
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic read head. The magnetic read head includes an antiferromagnetic layer recessed from the MFS, a reference layer disposed over the antiferromagnetic layer, a free layer disposed over the reference layer, and a thermally conductive structure disposed over the reference layer. The thermally conductive structure is recessed from the MFS. The thermally conductive structure includes a first portion and a second portion. The first portion of the thermally conductive structure extends from the second portion of the thermally conductive structure towards the MFS. The first portion of the thermally conductive structure is aligned with the free layer in a stripe height direction. With the thermally conductive structure, thermal stabilization of the read head is achieved.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: June 4, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Quang Le, Hongquan Jiang, Yongchul Ahn, Alexander M. Zeltser
  • Patent number: 10186284
    Abstract: According to one embodiment, a magnetic head includes a magnetic pole, and a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, a second layer and a third layer. The first layer includes at least one first element selected from the group consisting of Fe, Co, and Ni. The second layer is provided between the magnetic pole and the first layer, and includes at least one second element selected from the group consisting of Cr, V, Mn, Ti, and Sc. The third layer is provided between the first layer and the first shield, and includes at least one third element selected from the group consisting of Cr, V, Mn, Ti, and Sc.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: January 22, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoyuki Narita, Hitoshi Iwasaki, Mariko Shimizu, Katsuhiko Koui, Kenichiro Yamada
  • Patent number: 10157632
    Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a heavy metal structure surrounding at least a portion of the main pole at a media facing surface (MFS), and two magnetic structures sandwiching the heavy metal structure. Spin-orbit torque (SOT) is generated from the heavy metal structure, inducing magnetization switching (or precession) in the magnetic structures. The SOT reduces the magnetic flux shunting from the main pole to the trailing shield, and the magnetization switching sharpens the write field profile in the cross-track direction. The SOT based head with the magnetic structures sandwiching the heavy metal structure increases both track density (tracks per inch) and linear density (bit per inch), which in turn increases the areal density capability (ADC), which is the product of tracks per inch and bit per inch.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: December 18, 2018
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Suping Song, Zhanjie Li, Michael Kuok San Ho, Quang Le, Alexander M. Zeltser
  • Patent number: 10121497
    Abstract: A magnetic recording head has a main magnetic pole that generates a recording magnetic field applied on a magnetic recording medium from an end surface that is one portion of an air bearing surface facing the magnetic recording medium; a trailing shield provided on the trailing side of the main magnetic pole with a write gap interposed therebetween; and a spin torque oscillator that is provided in the write gap to be interposed between the main magnetic pole and the trailing shield and that generates a magnetic field that exerts an interaction on the recording magnetic field applied on the magnetic recording medium.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: November 6, 2018
    Assignee: TDK Coporation
    Inventors: Hirokazu Takahashi, Zhengyao Tang, Tetsuya Roppongi, Shinji Hara
  • Patent number: 10008224
    Abstract: A magnetic read element having an additional magnetic layer, “a floating magnetic shield”, formed as a part of a capping structure of a magnetoresistive element. The capping structure is formed over the magnetic free layer and includes a magnetic layer that is located between first and second non-magnetic layers. The magnetic layer can advantageously be formed with a high magnetic permeability for increased signal amplitude and increased signal resolution. In addition, because the magnetic layer of the capping layer structure acts as a magnetic shield, it can reduce effective magnetic gap spacing for increased signal resolution.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: June 26, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Takahiro Ibusuki, Kouji Kataoka, Takashi Wagatsuma, Norihiro Okawa, Yukimasa Okada
  • Patent number: 9978404
    Abstract: According to one embodiment, a magnetic recording head includes an air bearing surface, a magnetic pole having a distal end portion, a write shield opposed to the distal end portion of the magnetic pole across a write gap, and a high-frequency oscillator between the magnetic pole and the write shield in the write gap. The high-frequency oscillator includes a spin injection layer, an intermediate layer and an oscillation layer which are stacked in a head travel direction. A film thickness of the spin injection layer in the head travel direction at a height position away from the air bearing surface is greater than a film thickness of the spin injection layer in the head travel direction on the air bearing surface.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: May 22, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tomoko Taguchi, Yusuke Tomoda, Kenichiro Yamada, Satoshi Shirotori, Naoyuki Narita
  • Patent number: 9911438
    Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, and a magnetic head including a first reproducing unit. The first reproducing unit includes a first magnetic field generator separated from the magnetic recording medium in a first direction, and a first stacked body. At least a portion of the first stacked body is provided between the magnetic recording medium and the first magnetic field generator in the first direction. The first stacked body includes a first magnetic layer, a second magnetic layer separated from the first magnetic layer in a second direction crossing the first direction, and a first intermediate layer provided between the first magnetic layer and the second magnetic layer. The first stacked body performs an operation of generating a first alternating magnetic field. The first magnetic field generator generates a first magnetic field.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: March 6, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Taro Kanao, Hirofumi Suto, Koichi Mizushima, Rie Sato
  • Patent number: 9858952
    Abstract: A magnetic write head having a spin torque oscillator with a magnetic field sensor for accurately determining magnetic field oscillation frequency. The spin torque oscillator has one or more tunnel junction (TMR) sensors formed at the side of the spin torque oscillator. The TMR sensor advantageously detects a magnetic field signal that is an additive signal of both fields from the spin polarization layer and the magnetic field generation layer, thereby providing efficient detection of magnetic field and associated oscillation frequency.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: January 2, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Masashige Sato, Susumu Okamura, Yo Sato, Keiichi Nagasaka
  • Patent number: 9824701
    Abstract: A microwave assisted magnetic head includes a main magnetic pole; a trailing shield; and a spin torque oscillator provided between the main magnetic pole and the trailing shield. The spin torque oscillator has a first end surface configuring a part of an air bearing surface, a second end surface facing the main magnetic pole, and a third end surface facing the first end surface, the first angle ?1 made by the first end surface and the second end surface is smaller than the second angle ?2 formed by the second end surface and the third end surface, and the second angle ?2 is 80 to 100 degrees.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: November 21, 2017
    Assignee: TDK Corporation
    Inventors: Zhenyao Tang, Tetsuya Roppongi, Yoshikazu Soeno, Hironobu Matsuzawa, Hirokazu Takahashi
  • Patent number: 9799369
    Abstract: A magnetic recording system for preventing data loss resulting magnetic oscillator current. The magnetic recording system includes a magnetic write head with a magnetic write pole, a magnetic oscillator near the magnetic write pole, and a write coil for magnetizing the write pole. Circuitry is connected with the magnetic write coil to supply a current to the write coil and connected with the magnetic oscillator to supply a current to the magnetic oscillator. The circuitry is configured to ensure that the current to the magnetic oscillator does not inadvertently magnetize the write pole after the magnetic write pole has demagnetized.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: October 24, 2017
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Satoshi Tabata, Atsushi Yamada, Michiya Kazusawa, Masato Shiimoto
  • Patent number: 9792930
    Abstract: A microwave-assisted magnetic recording head includes a main magnetic pole, an auxiliary magnetic pole facing the main magnetic pole with a gap therebetween, and a stacked-layer element disposed in the gap. The stacked-layer element includes, in the order from the main magnetic pole to the auxiliary magnetic pole, a thermal spin injection layer that is formed on the main magnetic pole, exchange-coupled with the main magnetic pole, and formed of a magnetic material of which spin-dependent Seebeck coefficient is negative, a first non-magnetic layer formed on the thermal spin injection layer, an oscillation layer formed on the first non-magnetic layer, a second non-magnetic layer formed on the oscillation layer, and a spin injection layer formed on the second non-magnetic layer.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: October 17, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mariko Shimizu, Katsuhiko Koui, Shuichi Murakami
  • Patent number: 9761633
    Abstract: A method for fabricating a magnetic film structure is provided. The method comprises forming a magnetic structure on a bottom electrode layer, the magnetic structure comprising at least one pinned bottom magnetic film layer having a fixed magnetic orientation; at least one top magnetic film layer whose magnetic orientation can be manipulated by a current; and a tunneling layer between the bottom magnetic film layer and the top magnetic film layer; forming a metallic hard mask atop the magnetic structure; patterning and etching the metallic hard mask to define exposed areas of the magnetic structure; selectively etching the exposed areas of the magnetic structure by a chemical etch process based on a CO etch chemistry to form discrete magnetic bits.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: September 12, 2017
    Assignee: III HOLDINGS 1, LLC
    Inventors: Krishnakumar Mani, Benjamin Chen
  • Patent number: 9728209
    Abstract: A near-field transducer includes first and second stacked base portions having a common outline shape. The second base portion is proximate alight delivery structure. A peg extends from the first base portion towards a media-facing surface. The peg includes a material that is more thermally robust than a plasmonic material of the base portion. The peg has a peg thickness that is less than a thickness of the first base portion. The first base portion has a first recess proximate the peg. The first recess separates the first base portion from the media-facing surface and exposes at least a top side of the peg.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: August 8, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Weibin Chen, Martin Blaber, Tong Zhao, Michael Christopher Kautzky, John Charles Duda
  • Patent number: 9721604
    Abstract: A perpendicular magnetic recording writer is disclosed with a side shield separated from a write pole side by a gap layer at an air bearing surface (ABS) where the side shield has a first sidewall facing the write pole with an end at height (h1) from the ABS, and a second sidewall at height h1 that is parallel to the ABS. The write pole side is curved such that a first portion proximate to the ABS is at an angle of 0 to 40 degrees with respect to a center plane formed orthogonal to the ABS, and a second section proximate to a corner where the curved side connects with a flared main pole side is formed substantially parallel to the second sidewall. When h1 is 30-80 nm, and the corner is 80-150 nm from the ABS, overwrite is improved while cross-track field gradient is enhanced.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: August 1, 2017
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Yaguang Wei, Jiun-Ting Lee, Ping-Wei Zhuang
  • Patent number: 9721592
    Abstract: This perpendicular magnetic recording head includes: a magnetic pole; a pair of side shields disposed to face each other with the magnetic pole interposed therebetween in a cross track direction; a pair of side gaps each provided between the magnetic pole and the pair of side shields; a trailing gap provided to cover the magnetic pole and the pair of side gaps, and having a first width in the cross track direction; and a first magnetic layer covering the trailing gap and having a second width larger than the first width in the cross track direction.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: August 1, 2017
    Assignee: TDK CORPORATION
    Inventors: Kei Hirata, Shingo Miyata
  • Patent number: 9704510
    Abstract: A data writer can have at least a write pole separated from first and second side shields by a continuous dielectric gap layer. Each side shield may have first and second shield sub-layers configured with different magnetic moments that increase relative to the sub-layer's distance from the write pole. The side shields may wrap around a leading tip of the write pole to form a box shield.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: July 11, 2017
    Assignee: Seagate Technology LLC
    Inventors: Lei Lu, Kirill Rivkin, Xuelian Xu, Huaqing Yin
  • Patent number: 9704552
    Abstract: According to one embodiment, a magnetic recording apparatus includes a spin-torque oscillator, a recording unit, and a controller. The spin-torque oscillator includes an oscillation layer. The recording unit includes at least one recording layer. Magnetization reversal in each recording layer is performed by excitation of cooperative dynamics between magnetization of the oscillation layer and magnetization of the recording layer. The controller controls precession of the magnetization of the oscillation layer, which is induced by application of an electric current to the spin-torque oscillator.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: July 11, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kiwamu Kudo, Tazumi Nagasawa, Hirofumi Suto, Koichi Mizushima, Rie Sato
  • Patent number: 9653100
    Abstract: A magnetic head includes a coil, a main pole, a write shield, and a return path section. The coil includes a coil element located on the trailing side of the main pole. The coil element has a front end face facing toward the medium facing surface. The return path section includes a first portion, a second portion, and an intermediate film interposed between the first portion and the second portion. Part of the first portion is interposed between the medium facing surface and the front end face of the coil element. Part of the second portion is interposed between the first portion and the front end face of the coil element.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: May 16, 2017
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Yukinori Ikegawa, Kenichi Takano
  • Patent number: 9595917
    Abstract: An apparatus includes a polarizer, a first free layer, a second free layer, and an antiferromagnetic (AF) coupling layer. The polarizer has a perpendicular magnetic anisotropy (PMA). The polarizer, the first free layer, the second free layer, and the AF coupling layer are included in a spin-torque oscillator (STO). The AF coupling layer is positioned between the first free layer and the second free layer.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: March 14, 2017
    Assignee: Qualcomm Incorporated
    Inventors: Jimmy Kan, Kangho Lee, Seung Hyuk Kang
  • Patent number: 9589581
    Abstract: A microwave-assisted magnetic recording head according to an embodiment includes: a magnetic pole; a magnetic shield including a first portion and a second portion connecting to the first portion, a gap being present between the first portion and the magnetic pole; a recording coil disposed to at least one of the magnetic pole and the magnetic shield; and a spin torque oscillator including a nonmagnetic intermediate layer extending within and outside the gap, an oscillation layer disposed on a portion of the nonmagnetic intermediate layer in the gap, and a spin injection layer in which a magnetization direction is pinned and which is disposed on a portion of the nonmagnetic intermediate layer outside the gap so as to be separated from the oscillation layer.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: March 7, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Takagishi, Hitoshi Iwasaki, Kenichiro Yamada
  • Patent number: 9583134
    Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium and a magnetic head. The magnetic recording medium includes a first track including a first sub-track extending along a first direction, and a second sub-track extending along the first direction. The second sub-track is arranged with the first sub-track in a second direction intersecting the first direction. The magnetic head includes a recording unit and a reproducing unit. The recording unit records information in the magnetic recording medium. The reproducing unit reproduces the information recorded in the magnetic recording medium. The recording unit includes a magnetic pole, a write shield separated from the magnetic pole in the first direction, and a side shield separated from the magnetic pole in the second direction. The reproducing unit includes a reproducing element having a reproducing width along the second direction.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: February 28, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kenichiro Yamada, Masayuki Takagishi, Tomoyuki Maeda, Yousuke Isowaki, Shuichi Murakami, Naoyuki Narita, Yasushi Tomizawa
  • Patent number: 9502053
    Abstract: A magnetic head includes a main pole, a write shield, and a gap section. The write shield includes a trailing shield. The trailing shield includes a first portion, a second portion, a third portion and a fourth portion. The second portion and the third portion are located on opposite sides of the first portion in the track width direction. Top surfaces of the first to third portions are coplanar with each other. The fourth portion lies on the top surfaces of the first to third portions. The first portion is higher in saturation flux density than the second to fourth portions.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: November 22, 2016
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Yukinori Ikegawa, Kazumasa Yasuda
  • Patent number: 9378756
    Abstract: An example magnetic recording apparatus includes a magnetic recording medium, a magnetic recording head and a signal processor. The magnetic recording head includes a first magnetic pole to apply a recording magnetic field to the magnetic recording medium; a spin torque oscillator arranged parallel to the first magnetic pole; and a first coil to magnetize the first magnetic pole. The signal processor writes and reads a signal on the magnetic recording medium by using the magnetic recording head and includes a first current circuit to supply a recording current to the first coil, the recording current including a recording signal to be recorded on the magnetic recording medium. The recording current includes either one of a signal changing at a frequency higher than that of the recording signal, and a signal having the same frequency as the recording signal and changing an absolute value thereof in one cycle.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: June 28, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kenichiro Yamada, Hitoshi Iwasaki, Masayuki Takagishi
  • Patent number: 9355659
    Abstract: A magnetic recording head includes a main magnetic pole in which a recording magnetic field is generated, a write shield magnetic pole disposed alongside the main magnetic pole with a gap therebetween, a spin torque oscillator disposed within the gap and configured to generate a microwave, an anti-ferromagnetic layer disposed within the gap between the write shield magnetic pole and the spin torque oscillator, and a non-magnetic metal layer disposed within the gap between the spin torque oscillator and the anti-ferromagnetic layer.
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: May 31, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuhiko Koui, Mariko Shimizu, Shuichi Murakami, Kenichiro Yamada
  • Patent number: 9355657
    Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) erasure prevention for microwave assisted magnetic recording (MAMR) hard disk drives (HDDs). A first voltage is applied to an STO element in the MAMR head at the time of write operation. A second voltage is applied to the STO element at the time of read operation, or not write operation, to prevent STO erasure otherwise resulting from remnant magnetization of STO at the time of read operation.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: May 31, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Jun Aoyama, Masato Shiimoto
  • Patent number: 9343087
    Abstract: A method manufacturing a magnetic writer provides an intermediate layer including multiple sublayers is provided. The sublayers include first and second nonmagnetic layers and an etch stop layer being between the first and second nonmagnetic layers. A trench is formed in the intermediate layer using at least one etch, such as a reactive ion etch. The trench has a location and profile corresponding to the main pole. A main pole having a bottom and a top is provided in the trench. At least a portion of the second nonmagnetic layer is removed using at least a second etch, such as a wet etch process. The etch stop layer is resistant to the at least the second etch. A half side shield is provided on at least part of the first nonmagnetic layer. The half side shield bottom is between the top and the bottom of the main pole.
    Type: Grant
    Filed: December 21, 2014
    Date of Patent: May 17, 2016
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ronghui Zhou, Xiaoyu Yang, Ming Jiang, Jinqiu Zhang
  • Patent number: 9311934
    Abstract: Embodiments disclosed herein generally relate to a MAMR head. The MAMR head includes an STO and a current switching system electrically coupled to the STO. The current switching system can be used to optimize the STO frequency by changing the STO bias polarity, i.e., by changing the direction of the current flowing to the STO. As a result, the difference between the STO frequency and the magnetic media frequency is minimized, which improves recording capability of the MAMR head.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: April 12, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Masato Shiimoto, Masashige Sato, Masukazu Igarashi, Yo Sato, Masato Matsubara
  • Patent number: 9305586
    Abstract: A magnetic head, according to one embodiment, includes a magnetized high-speed rotor placed in the vicinity of a main magnetic pole, wherein the main magnetic pole generates a magnetized rotating magnetic field, wherein information is recorded by generating a high-frequency magnetic field from the magnetized high-speed rotor and switching the magnetic head between a magnetic resonance state and a magnetization state, and wherein the magnetic head has a structure such that leaking is reduced for magnetic fields applied parallel to a magnetized rotating surface of the magnetized high-speed rotor from the main magnetic pole. Additional systems and methods are also presented.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: April 5, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Masafumi Mochizuki, Masukazu Igarashi
  • Patent number: 9299366
    Abstract: A magnetic recording and reproducing apparatus includes a magnetic recording medium including a recording layer in which at least two magnetic layers are layered on a non-magnetic substrate; and a magnetic head including a main magnetic pole for applying a recording magnetic field in a direction substantially perpendicular to a recording face of the magnetic recording medium and a microwave generating element that generates a microwave magnetic field. The relationship between a thickness Ts of a magnetic layer having a lowest magnetic anisotropy energy among the at least two magnetic layers composing the recording layer of the magnetic recording medium, and a thickness Tt of the recording layer is Ts/Tt?0.2. The microwave generating element applies the microwave magnetic field having a width broader than the width of the recording magnetic field generated by the main magnetic pole of the magnetic head to the magnetic recording medium.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: March 29, 2016
    Assignee: TDK CORPORATION
    Inventors: Tsutomu Aoyama, Akimasa Kaizu, Tetsuhito Shinohara, Yoshikazu Soeno
  • Patent number: 9299367
    Abstract: A perpendicular magnetic recording (PMR) writer is disclosed wherein a 19-24 kG hot seed layer is formed between a gap layer and a 10-19 kG magnetic layer in a partially wrapped around shield structure involving side shields and trailing shield to reduce internal flux shunting, improve writability, and enable side gap and write gap dimensions 5-10 nm smaller than typical writers for conventional and shingled magnetic recording. Side shields have a bottom surface formed along a plane that is parallel to the main pole leading edge, and at a down-track distance from 50 nm above to 100 nm below the leading edge. Cross-track and down-track field gradients are improved by fully coupling the trailing shield and side shield hot seed layers. Also, side shield hot seed layers have a height <0.15 micron and less than the 10-19 kG side shield layer height to reduce internal flux shunting.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: March 29, 2016
    Assignee: Headway Technologies, Inc.
    Inventors: YuHui Tang, Yaguang Wei, Yue Liu, Jiun-Ting Lee, Moris Dovek
  • Patent number: 9230569
    Abstract: In one embodiment, a magnetic head includes a main magnetic pole positioned configured to generate a writing magnetic field when current is applied to a write coil, and a spin torque oscillator (STO) located adjacent the main magnetic pole, the STO being configured to generate a high frequency magnetic field when current is applied thereto, wherein the high frequency magnetic field is generated simultaneously to the writing magnetic field to assist in reversing magnetization of a magnetic recording medium. The STO includes: a spin polarization layer (SPL), a field generation layer (FGL) positioned adjacent the SPL, and one or more interlayers positioned between the SPL and the FGL, and a magnetization easy axis of the SPL is positioned in an in-plane direction such that the SPL has no perpendicular magnetic anisotropy.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: January 5, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Masato Shimoto, Masukazu Igarashi, Keiichi Nagasaka, Yo Sato, Susumu Okamura, Masashige Sato
  • Patent number: 9218824
    Abstract: A data writer may be generally configured at least with a write pole that has a pole sidewall and a continuous first taper angle connecting leading and trailing edges. The write pole can be positioned adjacent to a side shield that is configured with first and second shield sidewalls tapered to a shield tip that is the closest point between the write pole and side shield.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: December 22, 2015
    Assignee: Seagate Technology LLC
    Inventors: Eric Shane Linville, Jianhua Xue, Eric Roger Meloche, Huaqing Yin, Yonghua Chen
  • Patent number: 9202491
    Abstract: An apparatus (e.g., a heat assisted magnetic recording read/write element) that has an optical component that extends to a location adjacent a media-facing surface of a slider body. The apparatus further includes a planar plasmon antenna that is disposed between the tip portion of the magnetic write pole and the optical component. The planar plasmon antenna can be formed of a plasmonic material operationally capable of a plasmonic excitation in response to an evanescent coupling with an optical mode of the optical component. In some instances, the planar plasmon antenna includes an enlarged region spaced from the optical component and a peg region formed in the enlarged region. The peg region has a thickness in a direction substantially transverse to the optical component that is less than a thickness of a portion of the enlarged region that spaces the peg region from the optical component.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: December 1, 2015
    Assignee: Seagate Technology LLC
    Inventors: Weibin Chen, Werner Scholz
  • Patent number: 9183855
    Abstract: A magnetic recording head includes a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer, a write shield with a surface that faces a trailing side of the main magnetic pole, so that a write gap is interposed between the surface and the main magnetic pole, the write shield forming a magnetic core together with the main magnetic pole, a recording coil, a high frequency oscillator within the write gap, a wiring through which a current can flow through the main magnetic pole, the high frequency oscillator, and the write shield in series, and a magnetic element made of soft magnetic material, positioned within the write gap and separated from the high frequency oscillator, and configured to form a magnetic path passing through the main magnetic pole, the magnetic element, and the write shield, and not through the high frequency oscillator.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: November 10, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Tomoko Taguchi
  • Patent number: 9159342
    Abstract: According to an embodiment, a magnetic recording apparatus includes following elements. The spin torque oscillator generates a first oscillating magnetic field. The recording medium unit includes one or more recording medium layers which are stacked, each of the one or more recording medium layers including a recording medium and spin-wave lines each of which generates a second oscillating magnetic field. The write magnetic field source generates a write magnetic field. The controller is configured to control the spin torque oscillator, the spin-wave lines, and the write magnetic field source to simultaneously apply the write magnetic field, and the first and second oscillating magnetic fields to target medium magnetization in the recording medium.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: October 13, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kiwamu Kudo, Tazumi Nagasawa, Hirofumi Suto, Tao Yang, Koichi Mizushima, Rie Sato
  • Patent number: 9147411
    Abstract: According to one embodiment, a magnetic recording and reproducing device includes magnetic recording medium and a magnetic head. The magnetic recording medium includes a first surface. A plurality of bits is provided in the first surface. Each of the bits has a direction of magnetization corresponding to recorded information. The magnetic head includes a reproducing unit. The reproducing unit senses the direction of magnetization. The reproducing unit includes a first shield, a second shield, a first magnetic layer, a second magnetic layer, a third magnetic layer, a fourth magnetic layer, an intermediate layer, a first nonmagnetic layer, and a second nonmagnetic layer. The first and the second nonmagnetic layers include at least one selected from ruthenium, copper, and tantalum. A distance between the first shield and the second shield is not less than 3 times and not more than 7 times a length of each of the bits.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: September 29, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Takagishi, Hitoshi Iwasaki, Kenichiro Yamada, Yousuke Isowaki, Kohsuke Harada