Perpendicular Recording Head Patents (Class 360/125.02)
  • Patent number: 10891975
    Abstract: A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: January 12, 2021
    Assignee: SanDiskTechnologies LLC.
    Inventors: Zhigang Bai, Anna Zheng, Venkatesh Chembrolu, Supradeep Narayana, Yaguang Wei, Suping Song, Terence Lam, Michael Kuok San Ho, Changqing Shi, Lijie Guan, Jian-Gang Zhu
  • Patent number: 10755736
    Abstract: A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: August 25, 2020
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Lihong Zhang, PengBoon Khoo
  • Patent number: 10699733
    Abstract: A write head including a bearing surface and a write pole having a front surface that forms a portion of the bearing surface. The front surface has a leading edge, a trailing edge and side edges connecting the leading and trailing edges. The write head also includes side shields proximate to the side edges of the write pole, and a trailing shield over the write pole and the side shields. A trailing shield-write pole gap is present between the trailing edge and the trailing shield, and a trailing shield-side shield gap is present between the trailing shield and the side shields. The trailing shield-shield shield gap is substantially less than the trailing shield-write pole gap.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: June 30, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kirill A. Rivkin, Wei Tian, XiaoHong Zhang, Yi Liu
  • Patent number: 10608047
    Abstract: A magnetic memory element having voltage controlled magnetic anisotropy for active control of switching energy (delta). The magnetic memory element can be formed as a pillar structure having a magnetic free layer a magnetic reference layer and a non-magnetic barrier layer located between the magnetic free layer and the magnetic reference layer. A dielectric wall is formed around the side of the magnetic free layer and an electrically conductive program line is formed around the dielectric wall, such that the dielectric wall separates the program line from the magnetic free layer. The electrically conductive program line is electrically connected with circuitry to selectively apply a gate voltage to the electrically conductive program line and across the dielectric layer. The circuitry can include a voltage source switching circuitry such as a transistor. The gate voltage advantageously reduces perpendicular magnetic anisotropy in the magnetic free layer, thereby reducing switching energy.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: March 31, 2020
    Assignee: SPIN MEMORY, INC.
    Inventors: Marcin Gajek, Kuk-Hwan Kim
  • Patent number: 10403309
    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 trailing shield, and an oscillator located between the main pole and the trailing shield. The oscillator is disposed at a media facing surface (MFS). The oscillator includes a spin-torque layer sandwiched between two distinct spin Hall layers. The two distinct spin Hall layers generate spin-orbit torque (SOT) that induces in-plane precessions on opposite surfaces of the spin-torque layer, and both in-plane precessions are in the same direction. The same-direction in-plane precessions on opposite surfaces of the spin-torque layer reduce the critical current of the oscillation of the oscillator, leading to high quality recording.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: September 3, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Zhanjie Li, Suping Song, Michael Kuok San Ho
  • Patent number: 10102871
    Abstract: A write head for recording data on a storage medium. The write head includes a bearing surface and a write pole. The write pole includes a main pole layer having a front surface that forms a portion of the bearing surface. The front surface of the write pole has a leading edge and a trailing edge. The write pole further includes a high damping material layer. The high damping material layer has a front end that is attached to the main pole layer at the leading edge.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: October 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Swaraj Basu, Vijayharan A. Venugopal, Cillian O'Brian Fallon, Martin Liam McGarry
  • Patent number: 9741366
    Abstract: A method provides a magnetic transducer having a media-facing surface (MFS). The method includes providing a pole, providing a side gap, providing coil(s) for energizing the pole and providing side shield(s). A portion of the pole resides at the MFS. The side gap is between the pole and the side shield(s). The side shield(s) have a gradient in a saturation magnetization such that the saturation magnetization increases in a yoke direction perpendicular to the MFS. The step of providing the side shield(s) further includes providing a nonmagnetic structure having a side surface parallel to the MFS and providing at least one side shield layer. A portion of the side shield layer(s) are on the side surface. The portion of the side shield layer(s) has the gradient in the saturation magnetization. At least part of the side shield being formed by the portion of the side shield layer(s).
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: August 22, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Jinqiu Zhang, Feng Liu, Ming Sun, Yunfei Li, Ming Jiang, Xiaojun Zhang
  • Patent number: 9558763
    Abstract: A magnetic write apparatus has a media-facing surface (MFS), a pole, side shield(s), a side gap and coil(s) for energizing the pole. The pole includes main and assist portions. The main portion is ferromagnetic, includes a pole tip and includes side surface(s) having a flare angle from the MFS. The pole tip occupies a portion of the MFS. The flare angle is nonzero and acute. The assist portion adjoins the main portion, extends from the main portion in a direction having a component in a cross-track direction, and has a depth of not more than three hundred nanometers. The side shield(s) occupy another portion of the MFS, have a back surface, and are between the assist portion and the MFS. The assist portion is conformal with the back surface of the side shield(s). The side gap is between the main portion of the pole and the side shield(s).
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: January 31, 2017
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Peng Luo, Yunfei Li, Zhigang Bai, Hai Sun, Feng Liu, Zhanjie Li
  • Patent number: 9286919
    Abstract: A magnetic transducer has air-bearing surface (ABS) and includes a main pole, at least one coil, a side shield and a side gap. The coil(s) energize the main pole. A portion of the main pole resides at the ABS. The side gap is between the main pole and the side shield. The side gap is nonmagnetic and includes a first side gap and a second side gap. The first side gap is conformal with the main pole. The second side gap is conformal with the main pole. The first side gap is between the second side gap and the ABS. The second side gap is wider than the first side gap.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: March 15, 2016
    Assignee: Western Digital (Fremont), LLC
    Inventors: Feng Liu, Zhanjie Li, Tao Pan, Zhigang Bai
  • Patent number: 9269378
    Abstract: The present invention relates to stray magnetic shielding in PMR systems. The stray magnetic fields can funnel through the magnetic write head into the recording medium and lead to degradation in performance, even erasure. By placing a magnetic shield around the return pole, and spaced from the main pole by a nonmagnetic material, the stray magnetic flux is diverted into the additional stray field magnetic shields such that the stray magnetic fields travel mainly through the shield, away from the main pole. This ensures the stray magnetic flux density will be decreased greatly before reaching the recording medium, unable to negatively affect performance. To further ensure ease of manufacturing, the magnetic shield is made from the same material as the main pole, the return pole, or both.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: February 23, 2016
    Assignee: HGST NETHERLANDS B.V.
    Inventor: Supradeep Narayana
  • Patent number: 9251812
    Abstract: A first side shield has a first sidewall and a second sidewall. A second side shield has a third sidewall and a fourth sidewall. The distance between the first sidewall and the third sidewall decreases with increasing proximity to the top surface of a substrate. The second and fourth sidewalls are close to perpendicular to the top surface of the substrate. Each of the second and fourth sidewalls has an edge farthest from the top surface of the substrate, the edge being parallel to the medium facing surface. The main pole has a first, a second, a third and a fourth side surface. The first side surface is opposed to the first sidewall. A portion of the second side surface is opposed to the second sidewall. The third side surface is opposed to the third sidewall. A portion of the fourth side surface is opposed to the fourth sidewall.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: February 2, 2016
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Kazuki Sato, Hiroyuki Ito, Shigeki Tanemura, Hironori Araki, Kazumasa Yasuda
  • Patent number: 9082425
    Abstract: A magnetic shield may be capable of enhancing magnetic writing, particularly in transducing elements accessing data bits from data tracks. At least one magnetic shield is adjacent a write pole. The shield has a flux concentration feature on an air bearing surface (ABS) capable of enhancing magnetic undershoot between the shield and the write pole.
    Type: Grant
    Filed: May 4, 2011
    Date of Patent: July 14, 2015
    Assignee: Seagate Technology LLC
    Inventors: Radek Lopusnik, Kirill Aleksandrovich Rivkin, Mourad Benakli, James Gary Wessel, Scott Michael Franzen
  • Patent number: 9076463
    Abstract: According to one embodiment, a magnetic head includes a main pole configured to apply a recording magnetic field to a recording layer included in a recording medium, a trailing shield opposing the main pole in a down-track direction, with a write gap interposed therebetween, a pair of side shields opposing the main pole on opposite sides of the main pole in a cross-track direction, with respective gaps interposed therebetween, a recording coil configured to cause the main pole to generate a magnetic field, a first high-frequency oscillator interposed between the main pole and one of the side shields, and a second high-frequency oscillator interposed between the main pole and the other side shield.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: July 7, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kenichiro Yamada, Katsuhiko Koui, Akihiko Takeo
  • Patent number: 9036298
    Abstract: Recording heads for data storage systems are provided. Recording heads illustratively include a write pole, a bumper, a dielectric layer, and a surface. In some embodiments, a portion of the surface includes portions of the write pole, bumper, and dielectric layer. The write pole, bumper, and dielectric layer are illustratively made from materials that have polishing rates. In some embodiments, the polishing rate for the write pole material is more similar to the polishing rate for the bumper material than it is to the polishing rate for the dielectric layer material.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: May 19, 2015
    Assignee: Seagate Technology LLC
    Inventors: Edwin Frank Rejda, Huaqing Yin, Marc Perry Ronshaugen
  • Patent number: 8980109
    Abstract: A method fabricates a magnetic transducer having a nonmagnetic layer and an ABS location corresponding to an ABS. A pole trench is provided in the nonmagnetic layer. The pole trench has a pole tip region and a yoke region. At least one pole material is provided. The pole material(s) have an external protrusion that is above and external to the pole trench. A hard mask that covers at least the external protrusion is provided. A portion of the nonmagnetic layer adjacent to the pole trench is removed to form a side shield trench. At least one side shield material is provided. A portion of the side shield material(s) are adjacent to the hard mask and fill at least a portion of the side shield trench. The side shield material(s) and the pole material(s) are planarized to form at least one side shield and a main pole.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: March 17, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ronghui Zhou, Lily Yao, Ming Jiang, Lien-Chang Wang
  • Publication number: 20150049401
    Abstract: A perpendicular recording head and tape having some perpendicular component of magnetization are provided. The perpendicular recording head may contain at least two non-parallel poles such that each set of such poles may form the writing poles for recording a timing based servo band onto the tape medium.
    Type: Application
    Filed: December 9, 2011
    Publication date: February 19, 2015
    Inventor: Matthew P. Dugas
  • Patent number: 8922948
    Abstract: A thin-film magnetic head is constructed such that a main magnetic pole layer having a magnetic pole end face on a side of a medium-opposing surface opposing a recording medium, a write shield layer opposing the main magnetic pole layer on the medium-opposing surface side, a gap layer formed between the main magnetic pole layer and write shield layer, and a thin-film coil wound about the write shield layer or main magnetic pole layer are laminated on a substrate. This thin-film coil has a plurality of turn parts arranged at respective positions having different distances from the medium-opposing surface, while a non-expandable part made of an insulating material having a coefficient of thermal expansion smaller than that of a photosensitive resin is formed between the turn parts.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: December 30, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuo Ishizaki, Atsushi Iijima
  • Publication number: 20140340786
    Abstract: A method for reducing skew angle variation range in a shingled magnetic recording system, the method including the following steps: 1) determining whether a starting magnetic track is in an inner recording zone; if yes, proceeding to step 2), otherwise proceeding to step 4); 2) using an inner writing corner to start shingled magnetic recording at a starting track; 3) using a shingled magnetic method to write rest magnetic tracks sequentially by the inner writing corner, keeping a writing pole moving in a direction from an inner recording zone to an outer recording zone; 4) determining whether the starting magnetic track is in the outer recording zone; 5) using an outer writing corner to start shingled magnetic recording at the starting track; and 6) using the shingled magnetic method to write the rest magnetic tracks sequentially by the outer writing corner.
    Type: Application
    Filed: July 31, 2014
    Publication date: November 20, 2014
    Inventors: Shu XU, Bo LIU, Jincai CHEN
  • Patent number: 8817418
    Abstract: A magnetic head includes first and second coils, a main pole, a write shield, a return path section, and a core part. The write shield includes first and second shield portions located on opposite sides of the main pole in a track width direction. The return path section includes first and second yoke portions located on opposite sides of the main pole in the track width direction. The core part is magnetically connected to a part of the main pole located away from a medium facing surface. The first coil surrounds at least part of the entire outer periphery of the main pole. The second coil surrounds at least part of the core part.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: August 26, 2014
    Assignee: TDK Corporation
    Inventors: Atsushi Matsuo, Masahiro Saito, Kei Hirata
  • Patent number: 8810963
    Abstract: A magnetic head includes first and second coils, a main pole, a write shield, a return path section, and a yoke. The return path section is located on the front side in the direction of travel of a recording medium relative to the main pole. The yoke is located on the rear side in the direction of travel of the recording medium relative to the main pole. The first coil is wound around the main pole. The second coil is located on the rear side in the direction of travel of the recording medium relative to the main pole so as to pass between the main pole and the yoke.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: August 19, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Hironori Araki, Tatsuya Shimizu
  • Patent number: 8797685
    Abstract: A magnetic write head for data recording having a magnetic write pole with a stepped magnetic shell structure that defines a secondary flare point. The secondary flare point defined by the magnetic shell portion can be more tightly controlled with respect to its distance from the air bearing surface (ABS) of the write head than can a traditional flare point that is photolithographically on the main pole structure. This allows the effective flare point of the write head to be moved much closer to the ABS than would otherwise be possible using currently available tooling and photolithography techniques. The write head also includes a non-magnetic spacer layer formed over the magnetic shell structure that is recessed from the ABS by a distance that is greater than that of the magnetic shell portion. A magnetic shield is formed over the magnetic shell and non-magnetic spacer.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: August 5, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Christian Rene Bonhote, Jeffrey S. Lille, Scott Arthur MacDonald, Xhavin Sinha, Petrus Antonius Van Der Heijden
  • Patent number: 8760807
    Abstract: A method fabricates a magnetic transducer having a nonmagnetic layer and an ABS location corresponding to an ABS. Etch stop and nonmagnetic etchable layers are provided. A side shield layer is provided between the ABS location and the etch stop and etchable layers. A pole trench is formed in the side shield and etchable layers. The pole trench has a pole tip region in the side shield layer and a yoke region in the etchable layer. A nonmagnetic side gap layer, at least part of which is in the pole trench, is provided. A remaining portion of the pole trench has a location and profile for a pole and in which at least part of the pole is formed. A write gap and trailing shield are provided. At least part of the write gap is on the pole. At least part of the trailing shield is on the write gap.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Jinqiu Zhang, Ying Hong, Feng Liu, Zhigang Bai
  • Patent number: 8734894
    Abstract: A method of depositing material onto a base portion of a wafer is disclosed. The method includes forming a bevel into a portion of a surface of the base portion of the wafer and depositing a first layer of conductive material onto the beveled portion of the base portion so that part of the first layer includes a wedge shape above the surface of the base portion. A second layer of conductive material is deposited onto the base portion including the portion of the base portion onto which the first layer of material is deposited.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: May 27, 2014
    Assignee: Seagate Technology LLC
    Inventors: David Chris Seets, Chang Xie, Christopher J. Cote, Karen Virginia Rud
  • Patent number: 8701273
    Abstract: A method of manufacturing a magnetic head includes the step of forming an accommodation part and the step of forming a return path section. The return path section lies between a main pole and a top surface of a substrate, and connects a shield and part of the main pole away from a medium facing surface to each other so that a space through which part of a coil passes is defined. The accommodation part accommodates at least part of the return path section. The step of forming the return path section forms first to third portions simultaneously. The first portion is located closer to the top surface of the substrate than is the space. The second portion is located closer to the medium facing surface than is the space. The third portion is located farther from the medium facing surface than is the space.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: April 22, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Hironori Araki, Seiichiro Tomita, Kazuki Sato, Shigeki Tanemura, Tatsuya Shimizu
  • Patent number: 8634162
    Abstract: A magnetic write head for data recording having a magnetic write pole with a stepped magnetic shell structure that defines a secondary flare point. The secondary flare point defined by the magnetic shell portion can be more tightly controlled with respect to its distance from the air bearing surface (ABS) of the write head than can a traditional flare point that is photolithographically on the main pole structure. This allows the effective flare point of the write head to be moved much closer to the ABS than would otherwise be possible using currently available tooling and photolithography techniques. The write head may also include a magnetic trailing shield that wraps around the main pole portion. The trailing shield can have a hack edge defining a trailing shield throat height that is either between the secondary flare point or coincident or behind the secondary flare point, depending on design requirements.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: January 21, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Christian Rene Bonhote, Thomas Dudley Boone, Jr., Quang Le, Jui-Lung Li, Jeffrey S. Lille, Scott Arthur MacDonald, Neil Leslie Robertson, Xhavin Sinha, Petrus Antonius Van Der Heijden
  • Patent number: 8611045
    Abstract: A magnetic recording apparatus includes a magnetic recording medium that is provided with a first magnetic layer with magneto crystalline anisotropy energy, a second magnetic layer with magneto crystalline anisotropy energy that is smaller than the magneto crystalline anisotropy energy of the first magnetic layer, and a nonmagnetic metal layer that is positioned between the first magnetic layer and the second magnetic layer and that provides coupling force between the first magnetic layer and the second magnetic layer; and a magnetic head that includes a main pole that applies a recording magnetic field in a direction perpendicular to a film surface of the magnetic recording medium to the magnetic recording medium, and an alternate current (AC) magnetic field generator that applies an AC magnetic field with a frequency of 1-40 GHz to the magnetic recording medium.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: December 17, 2013
    Assignee: TDK Corporation
    Inventors: Akimasa Kaizu, Tsutomu Aoyama, Yoshikazu Soeno
  • Patent number: 8582234
    Abstract: A magnetic shield is adjacent a write pole. The write pole has a body portion with a body thickness and an extension portion with parallel first and second sides that each tilt towards the magnetic shield at a predetermined angle proximal to an air bearing surface (ABS). The extension portion may be capable of enhancing a write field gradient of the magnetic shield by reducing magnetic saturation.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: November 12, 2013
    Assignee: Seagate Technology LLC
    Inventors: Eric Linville, Eric Roger Meloche, Jianhua Xue, Huaqing Yin
  • Patent number: 8578594
    Abstract: A process for fabricating a magnetic recording transducer for use in a data storage system comprises providing a substrate, an underlayer and a first nonmagnetic intermediate layer deposited to a first thickness on and in contact with the underlayer, performing a first scanning polishing on a first section of the first intermediate layer to planarize the first section of the first intermediate layer to a second thickness, providing a main pole in the planarized first section of the first intermediate layer, providing a first pattern of photoresist on and in contact with the first section of the first intermediate layer, the pattern comprising an aperture to define a side shield trench, performing a wet etch to remove at least a portion of the first intermediate layer thereby exposing at least one of the plurality of main pole sides, and depositing side shield material in the side shield trench.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: November 12, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ming Jiang, Ronghui Zhou, Guanghong Luo, Masahiro Osugi, Danning Yang
  • Patent number: 8553359
    Abstract: A magnetic recording head includes a magnetic pole, a spin torque oscillator, a first shield and a second shield. The magnetic pole has an air-bearing surface. The spin torque oscillator is provided so that a first side of the spin torque oscillator faces the magnetic pole in a first direction parallel to the air-bearing surface. The first shield includes a granular magnetic material, and is provided so that two portions of the first shield sandwich the spin torque oscillator in a second direction which is parallel to the air-bearing surface and perpendicular to the first direction. The second shield is provided on a second side of the spin torque oscillator opposite to the first side.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: October 8, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kenichiro Yamada, Katsuhiko Koui, Mariko Kitazaki, Masayuki Takagishi, Tomomi Funayama, Masahiro Takashita, Soichi Oikawa, Akihiko Takeo
  • Patent number: 8470185
    Abstract: A method of manufacturing a perpendicular magnetic write head capable of precisely narrowing a side gap is provided. A tip portion having a cross sectional geometry of an inverted trapezoid is formed in an opening portion of a non-magnetic layer and thereafter, the non-magnetic layer is etched with the tip portion as a mask. Thereby, a portion adjacent to the tip portion in a writing track width direction remains and an outermost edge portion of the tip portion in that direction is located on a plane which coincides with an etching face (side face) of the non-magnetic layer. When a gap layer is formed with a vapor phase growth such as a sputtering method to cover the side face of the non-magnetic layer and thereafter a side shield layer is formed adjacently to the tip portion therethrough, a thickness of the gap layer becomes extremely thin and is reproduced precisely. Therefore, the side gap is narrowed with high precision.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: June 25, 2013
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Tetsuya Mino, Naoto Matono, Ikuhito Onodera, Kazushi Nishiyama, Michitoshi Tsuchiya, Kenji Sasaki
  • Patent number: 8470186
    Abstract: A perpendicular write head having a wrap around shield and a conformal side gap. In fabricating the write head, the leading edge shield may be chemical mechanical polished down to a level that is substantially even with a chemical mechanical polishing stop layer. Because the leading edge shield and the chemical mechanical polishing stop layer are used as RIE stop for trench RIE, a fully conformal side shield may be formed with a LTE/LES.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: June 25, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yingjian Chen, Shiwen Huang, Fenglin Liu, Kyusik Shin
  • Patent number: 8467147
    Abstract: A magnetic head comprises a pole layer, a first coil, a second coil, and a shield. The shield incorporates: a first portion located backward of the pole layer along the direction of travel of a recording medium; a second portion located forward of the pole layer along the direction of travel of the recording medium; and two coupling portions. The first portion has an end face located in a medium facing surface. The two coupling portions couple the first and second portions to each other without touching the pole layer. Part of the first coil passes through a space surrounded by the pole layer and the first portion. Part of the second coil passes through a space surrounded by the pole layer and the second portion.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: June 18, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Tatsushi Shimizu, Tatsuya Shimizu
  • Patent number: 8465658
    Abstract: In a method of forming a main pole, an initial accommodation layer is etched by RIE using a first etching mask having a first opening, whereby a groove is formed in the initial accommodation layer. Next, a part of the initial accommodation layer including the groove is etched by RIE using a second etching mask having a second opening, so that the groove becomes an accommodation part. The main pole is then formed in the accommodation part. The first etching mask has first and second sidewalls that face the first opening and are opposed to each other at a first distance in a track width direction. The second etching mask has third and fourth sidewalls that face the second opening and are opposed to each other at a second distance greater than the first distance.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: June 18, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Hironori Araki, Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Yukinori Ikegawa
  • Publication number: 20130135772
    Abstract: A method for manufacturing a magnetic sensor that includes depositing a plurality of mask layers, then forming a stripe height defining mask over the sensor layers. A first ion milling is performed just sufficiently to remove portions of the free layer that are not protected by the stripe height defining mask, the first ion milling being terminated at the non-magnetic barrier or spacer layer. A dielectric layer is then deposited, preferably by ion beam deposition. A second ion milling is then performed to remove portions of the pinned layer structure that are not protected by the mask, the free layer being protected during the second ion milling by the dielectric layer.
    Type: Application
    Filed: November 29, 2011
    Publication date: May 30, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yongchul Ahn, Xiaozhong Dang, Quang Le, Simon H. Liao
  • Patent number: 8432636
    Abstract: An aspect of the disclosure relates to data storage heater systems with diodes. In one embodiment, data storage systems include a first electrical connection point, a second electrical connection point, a first electrical branch, and a second electrical branch. The first electrical branch is connected to the first and the second electrical connection points. The first electrical branch has first and second diodes biased in a first direction. The second electrical branch is connected to the first and second electrical connection points. The second electrical branch has third and fourth diodes biased in a second direction.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: April 30, 2013
    Assignee: Seagate Technology LLC
    Inventor: John L. Brand
  • Patent number: 8427782
    Abstract: A magnetic layer for writing incorporates: a pole layer having an end face located in a medium facing surface and a lower yoke layer. A first magnetic layer for flux concentration is connected to the lower yoke layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a first coil. A second magnetic layer for flux concentration is connected to the pole layer at a location away from the medium facing surface, and passes a magnetic flux corresponding to a magnetic field generated by a second coil. A nonmagnetic layer is disposed between the pole layer and the lower yoke layer. The lower yoke layer is connected to the pole layer at a location closer to the medium facing surface than the nonmagnetic layer.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: April 23, 2013
    Assignees: Headway Technology, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Itoh, Shigeki Tanemura, Tatsushi Shimizu, Tatsuya Shimizu
  • Patent number: 8422166
    Abstract: A magnetic head includes a coil, a main pole, a write shield, and a return path section. The return path section is located forward of the main pole in a direction of travel of a recording medium to thereby define a space. The coil includes a first coil element and second coil elements extending to pass through the space. The second coil elements are located forward of the first coil element in the direction of travel of the recording medium. The return path section includes a first portion located such that the first coil element is interposed between the first portion and the medium facing surface, and a second portion located such that the second coil elements are interposed between the second portion and the medium facing surface.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: April 16, 2013
    Assignees: Headway Technologies, Inc., Sae Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Hironori Araki, Tatsuya Shimizu
  • Patent number: 8413317
    Abstract: A method and system for fabricating a microelectric device are described. A write pole of an energy assisted magnetic recording head or a capacitor might be fabricated. The method includes depositing a resist film and curing the resist film at a temperature of at least 180 degrees centigrade. A cured resist film capable of supporting a line having an aspect ratio of at least ten is thus provided. A portion of the cured resist film is removed. A remaining portion of the resist film forms the line. An insulating or nonmagnetic layer is deposited after formation of the line. The line is removed to provide a trench in the insulating or nonmagnetic layer. The trench has a height and a width. The height divided by the width corresponds to the aspect ratio. At least part of the structure is provided in the trench.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: April 9, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Dujiang Wan, Hai Sun, Ge Yi, Wei Gao, Hong Zhang, Guanghong Luo, Yunjun Tang, Tiffany Yun Wen Jiang, Zhigang Zhou, Wencheng Su
  • Patent number: 8416528
    Abstract: A magnetic head includes a main pole and a return path section located above a top surface of a substrate. The main pole has an end face located in a medium facing surface. The return path section is located on the front side in the direction of travel of a recording medium relative to the main pole and is farther from the top surface of the substrate than is the main pole. The return path section has: a front end face located on the front side of the main pole in the medium facing surface; and an inclined surface located on the front side and connected to the front end face. The inclined surface is not exposed in the medium facing surface. An angle greater than 90° is formed between the front end face and the inclined surface.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: April 9, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Yukinori Ikegawa, Atsushi Iijima, Tatsuya Shimizu
  • Patent number: 8404128
    Abstract: A method and system for providing a magnetic recording transducer having a pole are disclosed. The pole has side(s), a bottom, and a top wider than the bottom. The method and system include providing at least one side gap layer that covers the side(s) and the top of the pole. At least one sacrificial layer is provided on the side gap layer(s). The sacrificial layer(s) are wet etchable and cover the side gap layer(s). The magnetic recording transducer is planarized after the sacrificial layer(s) are provided. Thus, a portion of the side gap and sacrificial layer(s) is removed. A remaining portion of the sacrificial layer(s) is thus left. The method and system also include wet etching the sacrificial layer(s) to remove the remaining portion of the sacrificial layer(s). A wrap around shield is provided after the remaining portion of the sacrificial layer(s) is removed.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: March 26, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Hong Zhang, Ge Yi, Lei Wang, Dujiang Wan, Guanghong Luo, Xiaohai Xiang
  • Patent number: 8345381
    Abstract: A magnetic head includes a coil, a main pole, a shield, a return path section, and an accommodation part that are disposed above the top surface of a substrate. The accommodation part accommodates at least part of the return path section. The return path section lies between the main pole and the top surface of the substrate, and connects the shield and part of the main pole away from a medium facing surface to each other so that a space through which part of the coil passes is defined. The accommodation part includes an interposer interposed between the return path section and the medium facing surface. The interposer has an inclined surface facing toward the return path section. The return path section includes an inclined portion located between part of the coil and the inclined surface and extending along the inclined surface.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: January 1, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Hironori Araki, Seiichiro Tomita, Kazuki Sato, Shigeki Tanemura, Tatsuya Shimizu
  • Patent number: 8339735
    Abstract: A magnetic writer writes to a magnetic medium including a plurality of tracks that each includes a plurality of isolated magnetic elements for storage of information. The magnetic writer includes a write element having a write element tip having a leading edge, a trailing edge, and first and second side edges extending between the leading edge and the trailing edge. A side shield is proximate the first side edge and no shield is proximate the second side edge.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: December 25, 2012
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Mallary, Ching He, Kaizhong Gao
  • Patent number: 8339734
    Abstract: A magnetic write head having a magnetic write pole with a wrap around magnetic trailing shield. The wrap around magnetic trailing shield is separated by a first non-magnetic side gap at a first side of the write pole and by a second non-magnetic side gap at a second side of the write pole. The first second non-magnetic side gap is larger than the first non-magnetic side gap and is preferably at least twice the thickness of the first non-magnetic side gap. This design provides additional protection adjacent track interference at one side of the write pole and additional protection against magnetic write field loss at the other side of the write pole.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: December 25, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Aron Pentek, Yi Zheng
  • Patent number: 8300357
    Abstract: A magnetic head includes first and second coils, a main pole, a first shield, and first and second return path sections. The first shield and the first return path section are located forward of the main pole in the direction of travel of the recording medium. The first return path section connects the main pole and the first shield so that a first space is defined. The second return path section is located backward of the main pole in the direction of travel of the recording medium so that a second space is defined. The first coil includes at least one first coil element passing through the first space. The second coil includes a plurality of second coil elements passing through the second space. The at least one first coil element is smaller in number than the second coil elements.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: October 30, 2012
    Assignees: Headway Technologies, Inc., Sae Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Hironori Araki, Atsushi Iijima
  • Patent number: 8295008
    Abstract: A magnetic head includes a main pole, a write shield, and a gap part. The write shield includes first and second side shields and a top shield. The main pole has first and second side parts. The first side shield has a first sidewall. The second side shield has a second sidewall. The gap part includes a gap film and a nonmagnetic layer. The gap film is disposed to be in contact with the first and second sidewalls. The first side part has first and third side surfaces arranged in this order from the medium facing surface side. The second side part has second and fourth side surfaces arranged in this order from the medium facing surface side. The nonmagnetic layer is present between the third side surface and the first sidewall and between the fourth side surface and the second sidewall.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: October 23, 2012
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Kazuki Sato, Hiroyuki Ito, Kazumasa Yasuda, Atsushi Iijima
  • Patent number: 8259410
    Abstract: A method and system for providing a magnetic transducer for recording to media is described. The method and system include providing a first pole, a main pole, at least one coil and at least one auxiliary pole. The main pole is for providing a magnetic field for recording to the media. The coil(s) are for energizing the main pole. The auxiliary pole is magnetically coupled with the main pole. The shield(s) are for magnetically isolating a portion of the magnetic transducer. At least one of the first pole, the auxiliary pole, and the at least one shield includes a composite magnetic material including a plurality of ferromagnetic grains in an insulating matrix.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: September 4, 2012
    Inventors: Zhigang Bai, Suping Song, Matthew R. Gibbons, Sining Mao
  • Patent number: 8230583
    Abstract: A method for self aligning a lapping guide with a structure of a write pole. A write pole is formed over a substrate and an electrically conductive material lapping guide material is deposited in a location that is removed from the write pole. A mask is then formed over a portion of the write pole and a portion of the electrically conductive material. A material removal process such as reactive ion etching can then be performed to remove a portion of the magnetic material that is not protected by the mask structure. An magnetic material is then electroplated over the write pole with the write pole, with the mask still in place. In this way, the electroplated material has an edge that is self aligned with an edge of the electrically conductive lapping guide material, both being defined by the same mask structure.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: July 31, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventor: Jeffrey S. Lille
  • Patent number: 8228627
    Abstract: According to one embodiment, a magnetic disk drive includes a magnetic disk to be subjected to perpendicular recording, a first pole core including a main pole configured to record signals on the magnetic disk, a first coil wound around the first pole core, a second pole core magnetically independent of the first pole core, tip ends of which are arranged on both sides of the main pole, a second coil wound around the second pole core, a read unit including an element configured to read data recorded on the magnetic disk, and a correction unit configured to correct a current phase difference between the first and second coils.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: July 24, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Gaku Koizumi, Tomoko Taguchi
  • Patent number: 8223457
    Abstract: Magnetic heads for perpendicular magnetic recording on magnetic recording media are provided.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: July 17, 2012
    Assignee: University of Seoul Industry Cooperation Foundation
    Inventors: Doyeol Ahn, Hyung Kwon Kim
  • Patent number: 8196285
    Abstract: A method and system for providing a PMR pole in a transducer including an intermediate layer are disclosed. A mask including line(s) having side(s) is provided. A hard mask is provided on the mask. Portions of the hard mask reside on the line side(s) and intermediate layer surface. The hard mask includes a wet-etchable layer and a high removal ratio layer on the wet-etchable layer. Part of the hard mask on the side(s) of the line is removed, exposing part of the line. The high removal ratio layer has a low angle removal rate on the line side(s) and a high angle removal rate on the intermediate layer surface. The low angle removal rate is at least four times the high angle removal rate. The line is removed, providing an aperture in the hard mask. A trench is provided in the intermediate layer. A PMR pole is provided.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: June 12, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Jinqiu Zhang, Liubo Hong