Detail Of Magnetic Shielding Patents (Class 360/319)
  • Patent number: 10283148
    Abstract: An MTJ or MR read sensor is formed by depositing a stack in a reverse order with a free layer (FL) deposited on a lower shield, followed by a tunneling barrier layer (for an MTJ) or a conducting spacer layer (for an MR) and, finally, an antiferromagnetically coupled pinning structure and an upper shield. This reverse order permits a series of etching processes to be accurately performed on the lower shield and the stack together with the formation of biasing layers that are coupled to the lower shield and the stack, without adversely affecting the stability of the pinning structure. Further, the distance between the FL and the shield is accurately determined and repeatable even down to the sub-nm regime. An upper shield can then be formed and also coupled to the biasing layers.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: May 7, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Wenyu Chen, Yan Wu
  • Patent number: 10284001
    Abstract: The present invention relates to an electromagnetic shielding sheet capable of improving reliability. Particularly, the present invention provides a composite magnetic sheet for electromagnetic shielding structured such that an independent soft magnetic sheet, which has a low surface roughness, is laminated on the outermost surface of a soft magnetic sheet having a lamination structure, thereby implementing laminated composite sheets having different surface roughness or porosity characteristics; as a result, the reliability in an external hazardous environment, such as saline water, can be substantially enhanced while maintaining the efficiency of electromagnetic shielding.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: May 7, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventors: So Yeon Kim, Sang Won Lee, Jong Hyuk Lee, Seok Bae
  • Patent number: 10249329
    Abstract: A current perpendicular-to-the-plane magnetoresistive (CPP-MR) sensor for a magnetic recording medium has a substantially wedge-shaped free ferromagnetic layer. The free layer thickness is tapered from the back edge (the edge recessed from the medium-facing surface) to the front edge at the medium-facing surface. The thinner free layer front edge thickness reduces the read gap (the spacing between the two sensor magnetic shields), which improves the resolution of the sensor, which in turn allows the bits to be placed closer together in the along-the-track direction. The free layer is thicker at the back edge so the volume of free layer ferromagnetic material can be maintained at the level required for high amplitude of the readback signal.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: April 2, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Chih-Ching Hu, Yuankai Zheng, Yung-Hung Wang
  • Patent number: 10186285
    Abstract: A data reader may consist of at least a magnetoresistive stack positioned on an air bearing surface. A portion of the magnetoresistive stack may be set to a first fixed magnetization by a pinning structure separated from the air bearing surface by a front shield that is set to a second fixed magnetization by a biasing structure. The front shield may be separated from the biasing structure by a coupling structure.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: January 22, 2019
    Assignee: Seagate Technology LLC
    Inventors: Adam A. Lapicki, Sameh Hassan, YuQing Du, Mark T. Kief, Marcus W. Ormston
  • Patent number: 10164171
    Abstract: The disclosed technology includes an electronic device. The electronic device includes a semiconductor memory, and the semiconductor memory includes a variable resistance element that exhibits different resistance states for storing different data and is structured to include a planar shape including two curved potions of different curvatures.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: December 25, 2018
    Assignee: SK hynix Inc.
    Inventors: June-Seo Kim, Sung-Joon Yoon, Jung-Hwan Moon, Jeong-Myeong Kim, Chun-Yeol You
  • Patent number: 10153090
    Abstract: In an embodiment, one length-direction end of each first internal electrode layer 111a is connected to the first conductor layer 112 of the capacitor body 110 over a connection width equivalent to the width of each first internal electrode layer 111a, while the other length-direction end of each second internal electrode layer 111b is connected to the second conductor layer 113 over a connection width equivalent to the width of each second internal electrode layer 111b. One height-direction end of the first conductor layer 112 is connected to the first external electrode 120 over a connection width equivalent to the width of the first conductor layer 112, while one height-direction end of the second conductor layer 113 is connected to the second external electrode 130 over a connection width equivalent to the width of the second conductor layer 113.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: December 11, 2018
    Assignee: TAIYO YUDEN CO., LTD.
    Inventor: Yoichi Kato
  • Patent number: 10134980
    Abstract: In a method of manufacturing an MRAM device, a lower electrode and a preliminary first free layer pattern sequentially stacked are formed on a substrate. An upper portion of the preliminary first free layer pattern is removed to form a first free layer pattern. A second free layer and a tunnel barrier layer are sequentially formed on the first free layer pattern. The second free layer is partially oxidized to form a second free layer pattern. A fixed layer structure is formed on the tunnel barrier layer.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: November 20, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jong-Chul Park, Byoung-Jae Bae, Shin-Jae Kang, Young-Seok Choi
  • Patent number: 10121502
    Abstract: An apparatus according to one embodiment includes an array of transducer structures arranged along a tape bearing surface of a common module. Each transducer structure includes a lower shield, an upper shield above the lower shield, a current-perpendicular-to-plane sensor between the upper and lower shields, at least one lead, and an insulating layer between the at least one lead and the shield closest thereto. The at least one lead is selected from a group including an upper electrical lead between the sensor and the upper shield, and a lower electrical lead between the sensor and the lower shield. The at least one lead is in electrical communication with the sensor. A width of one or more of the at least one lead in a cross track direction is about equal to a width of the sensor.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: November 6, 2018
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Jason Liang, Calvin S. Lo
  • Patent number: 10121501
    Abstract: A magnetic read apparatus includes a read sensor, a shield structure and a side magnetic bias structure. The read sensor includes a free layer having a side and a nonmagnetic spacer layer. The shield structure includes a shield pinning structure and a shield reference structure. The nonmagnetic spacer layer is between the shield reference structure and the free layer. The shield reference structure is between the shield pinning structure and the nonmagnetic spacer layer. The shield pinning structure includes a pinned magnetic moment in a first direction. The shield reference structure includes a shield reference structure magnetic moment weakly coupled with the pinned magnetic moment. The side magnetic bias structure is adjacent to the side of the free layer.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: November 6, 2018
    Assignee: Western Digital (Fremont), LLC
    Inventors: Gerardo A. Bertero, Shaoping Li, Qunwen Leng, Yuankai Zheng, Rongfu Xiao, Ming Mao, Shihai He, Miaoyin Wang
  • Patent number: 10115419
    Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method includes providing a first shield, a first read sensor, an antiferromagnetically coupled (AFC) shield that includes an antiferromagnet, a second read sensor and a second shield. The read sensors are between the first and second shields. The AFC shield is between the read sensors. An optional anneal for the first shield is in a magnetic field at a first angle from the ABS. Anneals for the first and second read sensors are in magnetic fields in desired first and second read sensor bias directions. The AFC shield anneal is in a magnetic field at a third angle from the ABS. The second shield anneal is in a magnetic field at a fifth angle from the ABS. The fifth angle is selected based on a thickness and a desired AFC shield bias direction for the antiferromagnet.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: October 30, 2018
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Rongfu Xiao, Shihai He, Daniele Mauri, Ming Mao, Shaoping Li
  • Patent number: 10109304
    Abstract: A PMR (perpendicular magnetic recording) head includes a tapered main write pole (MP) with a beveled face and thin, laterally disposed side shields (SS) that do not fully extend along the sides on the write pole in the down-track direction. Denoting the down-track thickness of the side shields as SSt, that thickness satisfies 0<SSt<(MPt+LGt), where MPt is the thickness of the main pole and LGt is the thickness of the leading edge gap beneath the leading edge of the write pole. The thin side shields maintain the write bubble while producing a better Bits Per Inch-Tracks Per Inch (BPI-TPI) tradeoff line.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: October 23, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Yuhui Tang, Jiun-Tlng Lee, Yue Liu
  • Patent number: 10100414
    Abstract: An article exhibiting magnetic properties, a method for providing corrosion resistance to an article, and an electric machine element are disclosed. The article comprises a substrate comprising a first portion of a magnetic material, the magnetic material exhibiting magnetic properties. The article further comprises a transition layer comprising a second portion of the magnetic material and a first portion of a coating material. The transition layer is disposed on at least a portion of the substrate. The article further comprises an outer layer comprising a second portion of the coating material. The outer layer is disposed on at least a portion of the transition layer.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: October 16, 2018
    Assignee: General Electric Company
    Inventors: Steve J. Buresh, Paul A. Siemers, Jeremy Van Dam, Raul Basilio Rebak
  • Patent number: 10096331
    Abstract: A magnetic read head is provided, comprising a bottom magnetic shield, a first free magnetic layer, a second free magnetic layer, and a top magnetic shield, arranged from bottom to top in this order in a stacking direction from a leading side to a trailing side of the read head. A non-soft bias layer is positioned below the top magnetic shield and on a back side of the first and the second free magnetic layers. The top magnetic shield has a unidirectional anisotropy, the magnetic moments of the top and the bottom magnetic shields are canted relative to a plane of the first and the second free magnetic layers, and the top and the bottom magnetic shields are decoupled from the non-soft bias layer and not magnetically coupled to a soft bias layer.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: October 9, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Norihiro Okawa, Koujiro Komagaki, Takahiro Ibusuki
  • Patent number: 10090008
    Abstract: Implementations described and claimed herein include a reader structure, comprising a first reader, including a sensor stack and a top shield structure, the top shield structure comprises a synthetic antiferromagnetic shield (SAF) structure, including a reference layer including at least a layer of NiFe and an impurity additive, an RKKY coupling layer RKKY coupling layer (e.g., Ru layer), and a pinned layer. In another implementation, the RL of the SAF shield structure of a first reader includes at least a layer of amorphous magnetic material. Yet, in another implementation, the SAF shield structure includes an insertion layer of amorphous magnetic material under the SAF shield RL, within the SAF shield RL or between the SAF shield RL and SAF shield Ru.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: October 2, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Zhiguo Ge, Shaun E. McKinlay, Eric W. Singleton, LiWen Tan, Jae Young Yi
  • Patent number: 10074387
    Abstract: A method provides a magnetic transducer including a first antiferromagnetically coupled (AFC) shield, a second AFC shield and a read sensor between the first and second AFC shields. The first AFC shield includes first and second ferromagnetic layers and a first nonmagnetic spacer layer between the first and second ferromagnetic layers. The first and second ferromagnetic layers have first and second saturation magnetizations and first and second thicknesses, respectively. The second ferromagnetic layer is between the read sensor and the first ferromagnetic layer. The second AFC shield includes third and fourth ferromagnetic layers and a second nonmagnetic spacer layer between the third and fourth ferromagnetic layers. The third ferromagnetic layer is between the read sensor and the fourth ferromagnetic layer. The third and fourth ferromagnetic layers have third and saturation magnetizations and third and fourth thicknesses, respectively. The second AFC shield is a mirror image of the first AFC shield.
    Type: Grant
    Filed: December 21, 2014
    Date of Patent: September 11, 2018
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Rongfu Xiao, Miaoyin Wang, Zhihong Zhang, Guanghong Luo, Ming Mao
  • Patent number: 10068601
    Abstract: A magnetic read apparatus includes a media-facing surface (MFS), a sensor, a shield structure, a side bias structure, and a shield reference bias structure. The sensor includes a free layer and a nonmagnetic layer. The shield structure includes a shield pinning structure and a shield reference structure between the shield pinning structure and the nonmagnetic layer. The nonmagnetic layer is between the free layer and a shield reference structure. The shield pinning structure includes a pinned moment oriented in a first direction. The shield reference structure includes a reference structure moment weakly coupled with the pinned moment. The side bias structure is adjacent to a side of the free layer and biases the free layer in a first direction parallel to the MFS. The shield reference bias structure is adjacent to the shield reference structure and biases the shield reference structure in a direction opposite to the first direction.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: September 4, 2018
    Assignee: Western Digital (Fremont), LLC
    Inventors: Shaoping Li, Shihai He, Gerardo A. Bertero, Ming Mao, Yuankai Zheng, Anup Ghosh Roy, Chen-Jung Chien, Zhihong Zhang
  • Patent number: 10032469
    Abstract: A PMR (perpendicular magnetic recording) head includes a tapered write pole that is fully surrounded by wrapped-around magnetic shields, including laterally disposed side shields, a trailing shield and a leading shield. A layer of high magnetic saturation material (high Bs) is formed on the leading edge of the trailing shield and extends rearward, away from the ABS plane to define a cross-sectional write gap shape that is not conformal with the shape of the tapered write pole. The cross-sectional shape of this shield layer enables it to absorb flux from the write pole so that the flux for writing is enhanced and concentrated at the area of the recording medium being written upon and does not extend to adjacent tracks or to downtrack positions at which such flux is not desired.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: July 24, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Sanghyun Lim, Yuhui Tang, Yaguang Wei, Yue Liu, Moris Dovek
  • Patent number: 10026424
    Abstract: A data reader may be configured with at least a detector stack positioned on an air bearing surface and consisting of a spin accumulation channel continuously extending from the air bearing surface to an injector stack. The injector stack can have at least one cladding layer contacting the spin accumulation channel. The at least one cladding layer may have a length as measured perpendicular to the ABS that filters minority spins from the detector stack.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: July 17, 2018
    Assignee: Seagate Technology LLC
    Inventors: David A. Deen, Taras G. Pokhil
  • Patent number: 9997370
    Abstract: An electronic apparatus according to the invention includes a substrate, a side wall that is disposed directly on the substrate or via an insulation film and forms a hollow, a functional element that is disposed within the hollow, a first layer that is disposed on the side wall so as to cover the hollow and has a first through hole that communicates with the hollow, a second layer that is disposed on the first layer so as to cover the hollow and has a second through hole that has a diameter smaller than a diameter of the first through hole and at least partially overlaps the first through hole as viewed in plan view, and a third layer that is disposed on the second layer so as to seal at least the second through hole.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: June 12, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takahiko Yoshizawa
  • Patent number: 9947347
    Abstract: A magnetic sensor that generates a signal based on inverse spin Hall effect. The sensor includes a magnetic free layer and a non-magnetic, electrically conductive spin Hall layer located adjacent to the magnetic free layer. Circuitry is configured to supply an electrical current that travels through the magnetic free layer and the spin Hall layer in a direction that is generally perpendicular to the plane of the layers or perpendicular to a plane defined by an interface between the magnetic free layer and the spin Hall layer. The inverse spin Hall effect causes an electrical voltage in the spin Hall layer as a result of the current, and the voltage changes relative to the orientation of magnetization of the magnetic free layer. Circuitry is provided for measuring the voltage in the spin Hall layer in a direction that is generally perpendicular to the direction of the electrical current.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: April 17, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventors: Petrus Antonius Van Der Heijden, Quang Le, Kuok San Ho, Xiaoyong Liu, Gonçalo Marcos Baião De Albuquerque
  • Patent number: 9947348
    Abstract: An apparatus, according to one embodiment, includes: a transducer structure having: a lower shield, an upper shield above the lower shield, a current-perpendicular-to-plane sensor between the upper and lower shields, an electrical lead layer between the sensor and one of the shields, and a spacer layer between the electrical lead layer and the one of the shields. The upper and lower shields provide magnetic shielding. The electrical lead layer is in electrical communication with the sensor. A conductivity of the electrical lead layer is higher than a conductivity of the spacer layer. A width of the electrical lead layer in a cross-track direction is greater than the width of a free layer of the sensor.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Calvin S. Lo
  • Patent number: 9941465
    Abstract: A device includes a seed layer, a magnetic track layer disposed on the seed layer, an alloy layer disposed on the magnetic track layer, a tunnel barrier layer disposed on the alloy layer, a pinning layer disposed on the tunnel barrier layer, a synthetic antiferromagnetic layer spacer disposed on the pinning layer, a pinned layer disposed on the synthetic antiferromagnetic spacer layer and an antiferromagnetic layer disposed on the pinned layer, and another device includes a seed layer, an antiferromagnetic layer disposed on the seed layer, a pinned layer disposed on the antiferromagnetic layer, a synthetic antiferromagnetic layer spacer disposed on the pinned layer, a pinning layer disposed on the synthetic antiferromagnetic layer spacer, a tunnel barrier layer disposed on the pinning layer, an alloy layer disposed on the tunnel barrier layer and a magnetic track layer disposed on alloy layer.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: April 10, 2018
    Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Guohan Hu, Cheng-Wei Chien
  • Patent number: 9922672
    Abstract: A magnetic read apparatus has an air-bearing surface (ABS) and includes a read sensor and a rear magnetic bias structure. The read sensor includes first and second free layers, a spacer layer and a rear surface opposite to the ABS. The spacer layer is nonmagnetic and between the first and second free layers. The read sensor has a track width in a cross track direction parallel to the ABS. The rear magnetic bias structure magnetically biases the read sensor a stripe height direction perpendicular to the ABS. The read sensor is between the ABS and the rear magnetic bias structure. The rear magnetic bias structure has a width in the cross track direction and a length in the stripe height direction. The length is greater than the width. The width of the rear magnetic bias structure is substantially equal to the track width of the read sensor.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: March 20, 2018
    Assignee: Western Digital (Fremont), LLC
    Inventors: Daniele Mauri, Savas Gider, Hui Zhao, Ming Mao
  • Patent number: 9892747
    Abstract: An apparatus according to one embodiment includes a transducer structure having a lower shield and/or an upper shield. A current-perpendicular-to-plane sensor is positioned adjacent the shield(s). An electrical lead layer is positioned between the sensor and the upper or lower shield. The electrical lead layer is in electrical communication with the sensor. A spacer layer is positioned between the electrical lead layer and the upper or lower shield. A conductivity of the electrical lead layer is higher than a conductivity of the spacer layer.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: February 13, 2018
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Jason Liang, Calvin S. Lo
  • Patent number: 9886974
    Abstract: A reader having a bearing surface, a free layer, and a free layer biasing structure. The free layer biasing structure includes at least one side shield that applies a first bias field level to a front portion of the free layer that is nearest to the bearing surface and applies a second bias field level to a rear portion of the free layer that is farthest from the bearing surface. The second bias field level is greater than the first bias field level.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: February 6, 2018
    Assignee: Seagate Technology LLC
    Inventors: Scott Wilson Stokes, Victor Boris Sapozhnikov
  • Patent number: 9882118
    Abstract: A spin control mechanism includes a spin portion and a first channel portion. The spin portion has a magnetic moment that can be reversed and rotated. The first channel portion is provided in contact with the spin portion, and is configured from ferromagnetic insulator. Then, the spin control mechanism controls a direction of the magnetic moment of the spin portion using a spin current generated by a temperature gradient provided to the first channel portion.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: January 30, 2018
    Assignees: JAPAN SCIENCE AND TECHNOLOGY AGENCY, THE UNIVERSITY OF YORK
    Inventor: Atsufumi Hirohata
  • Patent number: 9870791
    Abstract: A multi-sensor reader that includes a first sensor that has a first sensor stack, which includes a sensing layer that has a magnetization that changes according to an external magnetic field. The first sensor also includes a first seed layer below the first sensor stack. The multi-sensor reader also includes a second sensor stacked over the first sensor. The second sensor includes a second sensor stack, which includes a sensing layer that has a magnetization that changes according to the external magnetic field. The second sensor also includes a second seed layer below the second sensor stack. A stabilization element is included to maintain a magnetization direction of the second seed layer and to stabilize the second seed layer.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Victor Sapozhnikov, Steven P. Bozeman, Mohammed Shariat Ullah Patwari, LiWen Tan, Jae Young Yi, Eric W. Singleton
  • Patent number: 9865804
    Abstract: A magnetoresistive-based device and method of manufacturing a magnetoresistive-based device using one or more hard masks. The process of manufacture, in one embodiment, includes patterning a mask over a selected portion of the third layer of ferromagnetic material, wherein the mask is a metal hard mask. Thereafter, etching through the third layer of ferromagnetic material to provide sidewalls of the second synthetic antiferromagnetic structure, through the second tunnel barrier layer to form a second tunnel barrier and provide sidewalls thereof and the second layer of ferromagnetic material to provide sidewalls thereof. Thereafter, etching, through the first tunnel barrier layer to form a first tunnel barrier to provide sidewalls thereof and etching the first layer of ferromagnetic material to provide sidewalls thereof. The process may then include oxidizing the sidewalls of (i) the first tunnel barrier and (ii) the first layer of ferromagnetic material.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: January 9, 2018
    Assignee: Everspin Technologies, Inc.
    Inventors: Sarin A. Deshpande, Sanjeev Aggarwal, Kerry Joseph Nagel
  • Patent number: 9837601
    Abstract: Provided is a magnetic shield having improved shielding properties from an external magnetic field. A magnetic shield MS1 has in-plane magnetization as remanent magnetization, and is adapted to generate a perpendicular component in the magnetization direction by applying a magnetic field in the perpendicular direction to the magnetic shield.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: December 5, 2017
    Assignee: Renesas Electronics Corporation
    Inventor: Tetsuhiro Suzuki
  • Patent number: 9812155
    Abstract: A method provides a magnetic read apparatus. A sensor stack is deposited. The read sensor is defined from the stack such that the sensor has sides forming a junction angle of 75 degrees-105 degrees from a sensor bottom. Defining the sensor includes performing a first ion mill at a first angle and a first energy and performing a second ion mill at a second angle greater than the first angle and at a second energy less than the first energy. The first angle is 5 degrees-30 degrees from normal to the top surface. After the first ion mill, less than half of the stack's bottom layer depth remains unmilled. Magnetic bias structure(s) adjacent to the sides may be formed. The magnetic bias structure(s) include a side shielding material having at least one of the saturation magnetization greater than 800 emu/cm3 and an exchange length less than five nanometers.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: November 7, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Anup Ghosh Roy, Guanxiong Li, Daniele Mauri, Ming Mao, Goncalo Albuquerque, Savas Gider
  • Patent number: 9805745
    Abstract: According to one embodiment, a magnetic head includes first and second shields, a magnetic pole, and a trailing shield. The magnetic pole is provided between the first and second shields. The trailing shield is separated from the magnetic pole. The first shield includes first magnetic layers and first nonmagnetic layers arranged alternately along a first stacking direction. The first nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the first nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers. The second shield includes second magnetic layers and second nonmagnetic layers arranged alternately along a second stacking direction. The second nonmagnetic layers include at least one selected from the group consisting of Ru, Cu, and Cr. Thicknesses of the second nonmagnetic layers each is not less than 0.3 nanometers and not more than 2.2 nanometers.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: October 31, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda, Yousuke Isowaki, Katsuya Sugawara
  • Patent number: 9773512
    Abstract: A write pole structure includes a write pole and a trailing shield wherein the write pole includes a high magnetic moment (HMM) material layer on a surface of the write pole facing the trailing shield, wherein the HMM material layer includes a laminated layer including a rare earth material layer and a transition metal layer.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: September 26, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Mark Anthony Gubbins, Vijayaharan A. Venugopal, Marcus Benedict Mooney, Adam Andrzej Lapicki, Muhammad Asif Bashir, Prim Gangmei
  • Patent number: 9767834
    Abstract: A magnetic head includes a magneto-resistance effect element in the form of a multilayer film, a pair of shields between which the magneto-resistance effect element is interposed in the lamination direction of the layers of the magneto-resistance effect element and each functioning as an electrode, a pair of side shields with one of said side shields on each side of the magneto-resistance effect element in the direction perpendicular to the lamination direction of the magneto-resistance effect element interposed between the pair of shields, the side shields magnetically coupled to either of the pair of shields, and an anisotropy-application layer disposed adjacent to the shield magnetically coupled to the pair of side shields. The pair of shields, the magneto-resistance effect element, and the pair of side shields are exposed on the air bearing surface facing a recording medium.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: September 19, 2017
    Assignee: TDK Corporation
    Inventors: Tetsuya Hiraki, Minoru Ota, Hisayoshi Watanabe, Takahiko Machita, Hideyuki Ukita
  • Patent number: 9754613
    Abstract: A method and system provide a magnetic transducer having an air-bearing surface (ABS). The method includes providing a first shield, a first read sensor, an antiferromagnetically coupled (AFC) shield that includes an antiferromagnet, a second read sensor and a second shield. The read sensors are between the first and second shields. The AFC shield is between the read sensors. An optional anneal for the first shield is in a magnetic field at a first angle from the ABS. Anneals for the first and second read sensors are in magnetic fields in desired first and second read sensor bias directions. The AFC shield anneal is in a magnetic field at a third angle from the ABS. The second shield anneal is in a magnetic field at a fifth angle from the ABS. The fifth angle is selected based on a thickness and a desired AFC shield bias direction for the antiferromagnet.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: September 5, 2017
    Assignee: Western Digital (Fremont), LLC
    Inventors: Rongfu Xiao, Shihai He, Daniele Mauri, Ming Mao, Shaoping Li
  • Patent number: 9747931
    Abstract: In one general embodiment, an apparatus includes an array of magnetic transducers each having: a current-perpendicular-to-plane sensor, shields for providing magnetic shielding, and a stabilizing layered structure between at least one of the shields and the sensor. The stabilizing layered structure includes an antiferromagnetic layer, a first ferromagnetic layer adjacent the antiferromagnetic layer, a second ferromagnetic layer, and an antiparallel coupling layer between the ferromagnetic layers. A magnetization direction in the second ferromagnetic layer is opposite the magnetization direction in the first ferromagnetic layer. Each transducer also includes an electrical lead layer positioned between the sensor and the stabilizing layered structure and in electrical communication with the sensor. Each transducer also includes a spacer layer between the respective electrical lead layer and the stabilizing layered structure.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: August 29, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Calvin S. Lo
  • Patent number: 9733107
    Abstract: Embodiments relate to xMR sensors, in particular AMR and/or TMR angle sensors with an angle range of 360 degrees. In embodiments, AMR angle sensors with a range of 360 degrees combine conventional, highly accurate AMR angle structures with structures in which an AMR layer is continuously magnetically biased by an exchange bias coupling effect. The equivalent bias field is lower than the external rotating magnetic field and is applied continuously to separate sensor structures. Thus, in contrast with conventional solutions, no temporary, auxiliary magnetic field need be generated, and embodiments are suitable for magnetic fields up to about 100 mT or more. Additional embodiments relate to combined TMR and AMR structures. In such embodiments, a TMR stack with a free layer functioning as an AMR structure is used. With a single such stack, contacted in different modes, a high-precision angle sensor with 360 degrees of uniqueness can be realized.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: August 15, 2017
    Assignee: Infineon Technologies AG
    Inventors: Juergen Zimmer, Klemens Pruegl
  • Patent number: 9720056
    Abstract: A magnetic sensor includes a channel layer, a magnetization free layer placed on a first section of the channel layer, and a magnetization-fixed layer placed on a second section of the channel layer. The areal resistance of the interface between the channel layer and the magnetization free layer is lower than the areal resistance of the interface between the channel layer and the magnetization-fixed layer.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: August 1, 2017
    Assignee: TDK CORPORATION
    Inventor: Tomoyuki Sasaki
  • Patent number: 9715889
    Abstract: A magnetic read apparatus has a media-facing surface (MFS) and includes a read sensor, a magnetic bias structure and an insulating layer. The read sensor has a side, a front occupying part of the MFS and a back. The read sensor includes a free layer, a pinned layer and a barrier layer between the free and pinned layers. The barrier layer has a barrier layer coefficient of thermal expansion. The magnetic bias structure is adjacent to the side of the free layer. The insulating layer includes first and second portions. The first portion of the insulating layer is between the read sensor side and the magnetic bias structure. The second portion of the insulating layer adjoins the read sensor back. The insulating layer has an insulating layer coefficient of thermal expansion that is at least ? of and not more than 5/3 of the barrier layer coefficient of thermal expansion.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: July 25, 2017
    Assignee: Western Digital (Fremont), LLC
    Inventors: Shaoping Li, Gerardo A. Bertero, Ming Mao, Shihai He, Steven C. Rudy, Haiwen Xi, Zhipeng Li, Haifeng Wang, Jianxin Fang, Zhihong Zhang, Yingbo Zhang, Qunwen Leng, Christopher L. Beaudry, Ruisheng Liu
  • Patent number: 9704515
    Abstract: A lateral spin valve reader includes a detector located proximate to a bearing surface of the reader, a spin injector located away from the bearing surface, and a channel layer that substantially extends from the detector to the spin injector. The channel layer and the detector are substantially in a same plane.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: July 11, 2017
    Assignee: Seagate Technology LLC
    Inventors: David A. Deen, Levent Colak, Thomas Roy Boonstra
  • Patent number: 9691417
    Abstract: A reader includes a bearing surface, a sensor stack and a bottom shield below the sensor stack. The bottom shield has a synthetic antiferromagnetic (SAF) structure that includes a first magnetic layer that has a first width at the bearing surface and a second magnetic layer that has a second width at the bearing surface. The second width is less than the first width. The second magnetic layer has a magnetic orientation with at least a component that is substantially orthogonal to the bearing surface.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: June 27, 2017
    Assignee: Seagate Technology LLC
    Inventors: Wonjoon Jung, Victor Sapozhnikov
  • Patent number: 9680089
    Abstract: A magnetic tunnel junction comprises a conductive first magnetic electrode comprising magnetic recording material, a conductive second magnetic electrode spaced from the first electrode and comprising magnetic reference material, and a non-magnetic tunnel insulator material between the first and second electrodes. The magnetic reference material of the second electrode comprises a synthetic antiferromagnetic construction comprising two spaced magnetic regions one of which is closer to the tunnel insulator material than is the other. The one magnetic region comprises a polarizer region comprising CoxFeyBz where “x” is from 0 to 90, “y” is from 10 to 90, and “z” is from 10 to 50. The CoxFeyBz is directly against the tunnel insulator. A non-magnetic region comprising an Os-containing material is between the two spaced magnetic regions. The other magnetic region comprises a magnetic Co-containing material. Other embodiments are disclosed.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: June 13, 2017
    Assignee: Micron Technology, Inc.
    Inventors: Wei Chen, Witold Kula, Manzar Siddik, Suresh Ramarajan, Jonathan D. Harms
  • Patent number: 9679591
    Abstract: A scissor type magnetic sensor for magnetic data recording having a flux closure magnetic side shield structure. The magnetic sensor has a magnetic side shield structure that includes a non-magnetic layer within a magnetic material layer, with the non-magnetic layer being removed from the sensor stack so as to define upper and lower magnetic portions of the magnetic structure that are separated from one another at a region away from the sensor stack. The upper and lower magnetic portions are connected with one another in a region near the sensor stack so as to magnetic flux closure structure. The novel magnetic side shield structure provides net neutral magnetization that does not provide an inadvertent biasing to the magnetic free layers of the magnetic sensor.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: June 13, 2017
    Assignee: HGST Netherlands B.V.
    Inventors: Wenqin Hao, Quang Le, Xiaoyong Liu, Suping Song, Lei Wang
  • Patent number: 9609792
    Abstract: The present invention discloses an electromagnetic wave shielding film, comprising at least one electromagnetic shielding layer. A printed circuit board comprising the shielding film, is formed by tightly connecting the electromagnetic wave shielding film with the printed circuit board in the direction of thickness, wherein a ground layer is disposed on said printed circuit board. A method for producing the circuit board, including the following steps: (1) hot-pressing and curing the electromagnetic shielding film with the circuit board in the direction of thickness; (2) piercing the adhesive film layer by a rough surface of the electromagnetic shielding layer, to achieve grounding. Or, including the following steps: (1) hot-pressing and curing the electromagnetic shielding film with the circuit board in the direction of thickness; (2) piercing the shielding film by an electrically conductive substance, to achieve grounding.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: March 28, 2017
    Assignee: GUANGZHOU FANG BANG ELECTRONICS CO., LTD.
    Inventor: Zhi Su
  • Patent number: 9601136
    Abstract: A data storage device employing a data writer may configure the data writer with at least a write pole that is separated from a front shield on an air bearing surface. The front shield can be arranged to continuously extend from the air bearing surface a first throat height distal the write pole and a second throat height proximal the write pole with the first and second throat heights being different.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: March 21, 2017
    Assignee: Seagate Technology LLC
    Inventors: Muhammad Asif Bashir, JianHua Xue, Beverley R. McConnell, Shengzhou Liao, Wei Tian, Prim Gangmei, Swaraj Basu, Mark A. Gubbins
  • Patent number: 9589583
    Abstract: The CPPGMR element of the present invention has an orientation layer 12 formed on a substrate 11 to texture a Heusler alloy into a (100) direction, an underlying layer 13 that is an electrode for magneto-resistance measurement stacked on the orientation layer 12, a lower ferromagnetic layer 14 and an upper ferromagnetic layer 16 each stacked on the underlying layer 13 and made of a Heusler alloy, a spacer layer 15 sandwiched between the lower ferromagnetic layers 14 and the upper ferromagnetic layers 16, and a cap layer 17 stacked on the upper ferromagnetic layer 16 for surface-protection. This manner makes it possible to provide, inexpensively, an element using a current-perpendicular-to-plane giant magneto-resistance effect (CPPGMR) of a thin film having a trilayered structure of a ferromagnetic metal/a nonmagnetic metal/a ferromagnetic metal, thereby showing excellent performances.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: March 7, 2017
    Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Ye Du, Takao Furubayashi, Yukiko Takahashi, Kazuhiro Hono
  • Patent number: 9583123
    Abstract: According to one embodiment, a magnetoresistance effect element includes first and second shields, first and second side magnetic units, a stacked body, and a hard bias unit. The first side magnetic unit includes a first soft magnetic layer, a first nonmagnetic intermediate layer, and a second soft magnetic layer. The second side magnetic unit includes a third soft magnetic layer, a second nonmagnetic intermediate layer, and a fourth soft magnetic layer. The stacked body includes a fifth ferromagnetic layer, a third nonmagnetic intermediate layer, and a sixth ferromagnetic layer. The hard bias unit is provided between the first and second shields. A first distance between the first and fifth magnetic layers is shorter than a second distance between the second and sixth magnetic layers. A third distance between the third and fifth magnetic layers is shorter than a fourth distance between the fourth and sixth magnetic layers.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: February 28, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yousuke Isowaki, Satoshi Shirotori, Masayuki Takagishi, Hitoshi Iwasaki
  • Patent number: 9548069
    Abstract: The present invention generally relates to a method for forming a smooth gap of a damascene write pole. An opening having a side wall with a first angle with respect to vertical is formed in a fill layer, and a first non-magnetic layer is deposited into the opening by ion beam deposition. The ion beam is delivered to the side wall at a second angle with respect to vertical. The ratio of the first angle to the second angle ranges from about 250 to about 3.5.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 17, 2017
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Ning Shi, Xiaoyu Xu, Sue S. Zhang
  • Patent number: 9523747
    Abstract: A magnetoresistive device includes a carrier, an xMR-sensor, a magnetic layer formed above an active xMR-region of the xMR-sensor and an insulating layer arranged between the xMR-sensor and the magnetic layer.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: December 20, 2016
    Assignee: Infineon Technologies AG
    Inventor: Wolfgang Raberg
  • Patent number: 9520147
    Abstract: A MR sensor is disclosed that has a free layer (FL) with perpendicular magnetic anisotropy (PMA) which eliminates the need for an adjacent hard bias structure to stabilize free layer magnetization and minimizes shield-FL interactions. In a TMR embodiment, a seed layer, free layer, junction layer, reference layer, and pinning layer are sequentially formed on a bottom shield. After patterning, a conformal insulation layer is formed along the sensor sidewall. Thereafter, a top shield is formed on the insulation layer and includes side shields that are separated from the FL by a narrow read gap. The sensor is scalable to widths <50 nm when PMA is greater than the FL self-demag field. Effective bias field is rather insensitive to sensor aspect ratio which makes tall stripe and narrow width sensors a viable approach for high RA TMR configurations. Sensor sidewalls may extend into the seed layer or bottom shield.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 13, 2016
    Assignee: Headway Technologies, Inc.
    Inventors: Yuchen Zhou, Kunliang Zhang, Zhigang Bai
  • Patent number: 9508367
    Abstract: In one general embodiment, an apparatus includes a sensor having an active tunnel magnetoresistive region, magnetic shields flanking the tunnel magnetoresistive region, and spacers between the active tunnel magnetoresistive region and the magnetic shields. The active tunnel magnetoresistive region includes a free layer, a tunnel barrier layer and a reference layer. At least one of the spacers includes an electrically conductive ceramic layer. The presence of the electrically conductive ceramic layer enables current-perpendicular-to-plane operation, while enhancing wear resistance and resistance to deformities of the thin films.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: November 29, 2016
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Philip M. Rice, Teya Topuria