Patents by Inventor Mikito Sugiyama

Mikito Sugiyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200342899
    Abstract: A write head for a data storage device comprises a main pole, a trailing shield, and a write-field enhancement structure disposed in a write gap between the main pole and the trailing shield. The write-field enhancement structure comprises a non-magnetic spacer, a non-magnetic layer, and a magnetic DC-field-generation (DFG) layer. The DFG layer is sandwiched between the non-magnetic layer and the non-magnetic spacer. The write head also includes at least one magnetic notch adjacent to at least one of the main pole or the trailing shield. The non-magnetic spacer is adjacent to a magnetic notch. Some embodiments include multiple magnetic notches. Also disclosed are data storage devices comprising such write heads.
    Type: Application
    Filed: April 24, 2020
    Publication date: October 29, 2020
    Applicant: Western Digital Technologies, Inc.
    Inventors: James Terrence OLSON, Hiroyuki HOSHIYA, Alexander GONCHAROV, Masato SHIIMOTO, Mikito SUGIYAMA
  • Patent number: 10811039
    Abstract: Disclosed herein are perpendicular magnetic recording writers for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. A spin-torque-assisting element is disposed in the write gap and extends to the air-bearing surface (ABS). The spin-torque-assisting element comprises a non-magnetic layer in contact with a main pole, a DC-field generation (DFG) layer with a first side in contact with the non-magnetic layer, and a spacer layer in contact with a second side of the DFG layer. A magnetization of the DFG layer is configured to be aligned substantially parallel to a write gap magnetic field generated by the main pole during a write process, and the magnetization of the DFG layer is configured to flip its direction in response to application of a bias current exceeding a specified magnitude.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: October 20, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Terrence Olson, Hiroyuki Hoshiya, Alexander Goncharov, Masato Shiimoto, Mikito Sugiyama
  • Publication number: 20200312501
    Abstract: A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter D50 of 1.3 ?m or more and 5.0 ?m or less (i.e., from 1.3 ?m to 5.0 ?m), and second particles having a median diameter D50 larger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Takuya ISHIDA, Mikito SUGIYAMA, Mitsuru ODAHARA, Hideaki OOI, Koichi IDA
  • Publication number: 20200234729
    Abstract: Disclosed herein are magnetic write heads for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. Within the write gap, each magnetic write head comprises a main pole, a trailing shield, a spacer disposed between the main pole and the trailing shield, a non-magnetic layer disposed between the main pole and the trailing shield, and a magnetic DC-field-generation (DFG) layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer. In some embodiments, the DFG layer is the only magnetic layer within the write gap that is not adjacent to the main pole or the trailing shield.
    Type: Application
    Filed: January 22, 2020
    Publication date: July 23, 2020
    Applicant: Western Digital Technologies, Inc.
    Inventors: James Terrence OLSON, Hiroyuki HOSHIYA, Alexander GONCHAROV, Masato SHIIMOTO, Mikito SUGIYAMA
  • Publication number: 20200118733
    Abstract: A coil component includes a body and a coil conductor embedded in the body. The body includes a magnetic layer and a non-magnetic layer. The magnetic layer is formed of a composite material including a metal particle and a resin material, and the non-magnetic layer is arranged to block between at least one of top and bottom surfaces of the body and the coil conductor.
    Type: Application
    Filed: December 16, 2019
    Publication date: April 16, 2020
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Noriko SHIMIZU, Gota SHINOHARA, Mikito SUGIYAMA, Mari YONEMURA
  • Publication number: 20200118734
    Abstract: A coil component includes a body and a coil conductor embedded in the body. The body includes a magnetic layer and a non-magnetic layer. The magnetic layer is formed of a composite material including a metal particle and a resin material, and the non-magnetic layer is arranged not to extend through a winding portion of the coil conductor or not to entirely extend through the body.
    Type: Application
    Filed: December 16, 2019
    Publication date: April 16, 2020
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Noriko SHIMIZU, Gota SHINOHARA, Mikito SUGIYAMA, Mari YONEMURA
  • Patent number: 10546603
    Abstract: Disclosed herein are magnetic write heads and hard disk drives comprising such magnetic write heads. A magnetic head comprises a magnetic pole, a first shield separated from the magnetic pole at an air-bearing surface (ABS) of the magnetic head, a magnetic layer disposed between the magnetic pole and the first shield, wherein the magnetic layer comprises at least of iron, cobalt, or nickel, a first non-magnetic layer disposed between the magnetic pole and the magnetic layer, and a second non-magnetic layer disposed between the magnetic layer and the first shield, wherein the magnetic layer is the only magnetic layer at the ABS that is between the main pole and the first shield that is not adjacent to the main pole or the first shield.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: January 28, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Terrence Olson, Hiroyuki Hoshiya, Alexander Goncharov, Masato Shiimoto, Mikito Sugiyama
  • Publication number: 20190295572
    Abstract: Disclosed herein are magnetic write heads and hard disk drives comprising such magnetic write heads. A magnetic head comprises a magnetic pole, a first shield separated from the magnetic pole at an air-bearing surface (ABS) of the magnetic head, a magnetic layer disposed between the magnetic pole and the first shield, wherein the magnetic layer comprises at least of iron, cobalt, or nickel, a first non-magnetic layer disposed between the magnetic pole and the magnetic layer, and a second non-magnetic layer disposed between the magnetic layer and the first shield, wherein the magnetic layer is the only magnetic layer at the ABS that is between the main pole and the first shield that is not adjacent to the main pole or the first shield.
    Type: Application
    Filed: June 13, 2019
    Publication date: September 26, 2019
    Applicant: Western Digital Technologies, Inc.
    Inventors: James Terrence OLSON, Hiroyuki HOSHIYA, Alexander GONCHAROV, Masato SHIIMOTO, Mikito SUGIYAMA
  • Patent number: 10366714
    Abstract: Disclosed herein are magnetic write heads for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. Within the write gap, each magnetic write head comprises a main pole, a trailing shield, a spacer disposed between the main pole and the trailing shield, a non-magnetic layer disposed between the main pole and the trailing shield, and a magnetic DC-field-generation (DFG) layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer. In some embodiments, the DFG layer is the only magnetic layer within the write gap that is not adjacent to the main pole or the trailing shield.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: July 30, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Terrence Olson, Hiroyuki Hoshiya, Alexander Goncharov, Masato Shiimoto, Mikito Sugiyama
  • Publication number: 20190221357
    Abstract: A coil component includes a body, a coil conductor embedded in the body, and outer electrodes disposed on the outside of the body. The body includes a first magnetic layer containing a substantially spherical metallic magnetic material and second and third layers containing a substantially flat metallic magnetic material. At least the wound section of the coil conductor is between the second and third magnetic layers in the direction along the axis of the coil conductor. In the direction perpendicular to the axis, the second and third magnetic layers have a width equal to or larger than the outer diameter of the wound section of the coil component. The substantially flat metallic magnetic material is oriented so that the flat plane thereof is perpendicular to the axis of the coil conductor. The first magnetic layer extends between the second and third magnetic layers and the outer electrodes.
    Type: Application
    Filed: December 7, 2018
    Publication date: July 18, 2019
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Mikito SUGIYAMA, Mitsuru ODAHARA, Takuya ISHIDA, Hideaki OOI, Takao KAWACHI
  • Patent number: 9390733
    Abstract: In one embodiment, a magnetic head includes a main pole configured to emit a recording magnetic field for affecting a magnetic medium, the main pole configured to serve as a first electrode and having a front portion at an air bearing surface (ABS) of the magnetic head and a rear portion extending from the front portion in an element height direction perpendicular to the ABS, wherein an upper surface of the front portion of the main pole is angled with respect to a plane of deposition at a first angle of inclination of greater than 0°, and wherein at least a portion of an upper surface of the rear portion of the main pole is angled at a first angle of declination greater than 0° with respect to the plane of deposition, an upper shield positioned above the main pole, the upper shield configured to serve as a second electrode, and a microwave oscillator positioned between the main pole and the upper shield at the ABS.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: July 12, 2016
    Assignee: HGST Netherlans B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Tomohiro Okada
  • Patent number: 9355655
    Abstract: In one embodiment, a magnetic recording head includes: a main pole configured to generate a magnetic field for recording data on a magnetic recording medium; an oscillation device positioned above the main pole in a track direction, the oscillation device being configured to generate a high-frequency magnetic field; a magnetic capping layer positioned above the oscillation device in the track direction, the magnetic layer having a front region at a media facing side (MFS) of the magnetic recording head and a rear region positioned behind the front region in an element height direction, wherein a thickness of the front region of the magnetic capping layer is less than a thickness of the rear region thereof; and a trailing shield positioned above the magnetic capping layer in the track direction.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: May 31, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Yuta Udo, Mikito Sugiyama, Katsuro Watanabe, Masashi Hattori, Nobuo Yoshida, Kimitoshi Etoh
  • Patent number: 9230573
    Abstract: A magnetic write head having a write pole with a tapered trailing edge and a magnetic oscillator formed on the trailing edge of the write pole. The magnetic oscillator is sandwiched between the magnetic write pole and a trailing magnetic shield. The write head also includes a non-magnetic, electrically conductive bump structure located over a back portion of the magnetic oscillator between the magnetic oscillator and the trailing magnetic shield. The presence of the non-magnetic, electrically conductive bump structure causes electrons to properly flow through the magnetic oscillator in a direction that is generally perpendicular to the plane of the magnetic oscillator, even when the magnetic oscillator is formed on an inclined plane on the tapered trailing edge of the write pole. This thereby ensures optimal performance of the magnetic oscillator.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: January 5, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Kenji Sugiura, Mikito Sugiyama, Yohji Maruyama, Kazuhiko Hosomi, Katsuro Watanabe
  • Patent number: 9165575
    Abstract: In one embodiment, an apparatus includes at least one read head, each read head including a magnetoresistive (MR) read element, having a lower shield layer, an underlayer positioned above the lower shield layer, an antiferromagnetic (AFM) layer positioned above the underlayer, a magnetization pinned layer positioned above the AFM layer, an insulating layer positioned above the magnetization pinned layer, and a magnetization free layer positioned above the insulating layer, magnetic side shields positioned on both sides of the MR read element in a cross-track direction, and at least one shield excitation coil configured to excite magnetization of the side shields. In another embodiment, a method for forming a read sensor includes forming a MR read element, forming magnetic side shields on both sides of the MR read element in a cross-track direction, and forming at least one shield excitation coil configured to excite magnetization of the side shields.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: October 20, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Jun Aoyama, Mikito Sugiyama
  • Patent number: 9142227
    Abstract: A microwave-assisted magnetic recording (MAMR) write head includes a yoke structure with a main pole, a flux return pole, and a trailing magnetic shield. The main pole includes a write pole with a tip at the disk-facing surface, a sub pole with an end recessed from the disk-facing surface and an electrically insulating layer between the write pole and the sub pole. The spin-torque oscillator (STO) is located at the disk-facing surface between the trailing shield and the write pole tip. The insulating layer assures that the STO current is not shorted between the return pole and the write pole. The insulating layer between the write pole and the sub pole increases the area of the junction between the return pole and write pole, which reduces the magnetic reluctance of the yoke structure.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: September 22, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Masahiko Hatatani, Kazuhiko Hosomi, Yohji Maruyama, Kenji Sugiura, Mikito Sugiyama
  • Patent number: 9135933
    Abstract: Embodiments described herein provide an MAMR head structure which provides a magnetic recording device equipped with a high density recording magnetic head. Characteristic variations caused by misalignment of a main pole and a STO may be reduced because the STO may be aligned with a position on the main pole where the field intensity is enhanced. The enhanced field intensity may be provided by an angle of inclination ?1 of an inclined surface on which the STO may be formed when compared to an angle of inclination ?2 around the main pole in the region of the ABS. Further embodiments provide a method for producing an MAMR head in which an exposed surface of the main pole has an angle of inclination ?2 which is less than the angle of inclination ?1 for the inclined surface of the main pole where the STO is mounted.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: September 15, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Isao Nunokawa, Mikito Sugiyama, Yuta Udo
  • Publication number: 20150248904
    Abstract: In one embodiment, an apparatus includes at least one read head, each read head including a magnetoresistive (MR) read element, having a lower shield layer, an underlayer positioned above the lower shield layer, an antiferromagnetic (AFM) layer positioned above the underlayer, a magnetization pinned layer positioned above the AFM layer, an insulating layer positioned above the magnetization pinned layer, and a magnetization free layer positioned above the insulating layer, magnetic side shields positioned on both sides of the MR read element in a cross-track direction, and at least one shield excitation coil configured to excite magnetization of the side shields. In another embodiment, a method for forming a read sensor includes forming a MR read element, forming magnetic side shields on both sides of the MR read element in a cross-track direction, and forming at least one shield excitation coil configured to excite magnetization of the side shields.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 3, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Jun Aoyama, Mikito Sugiyama
  • Patent number: 9082434
    Abstract: Embodiments described herein generally relate to a magnetic read head wherein read sensitivity distribution is made asymmetric in the off-track direction. The method of making the magnetic head is also disclosed. The read head may comprise a magneto-resistive effect element with an asymmetric structure around the element in the off-track direction and the read sensitivity profile in the off-track direction may also be asymmetric.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: July 14, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Jun Aoyama, Hiroyuki Katada, Masato Shiimoto, Mikito Sugiyama, Yosuke Urakami
  • Patent number: 9076462
    Abstract: In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium using a magnetic field, a return pole positioned above the main pole at a media-facing surface of the magnetic head, the return pole being configured to return magnetic flux from the main pole after it has exited a magnetic medium, and a coil configured to produce magnetic flux in the main pole, the coil being positioned below the return pole, wherein a film thickness of a first turn of the coil on a media-facing surface side thereof is less than a film thickness of a second turn of the coil. Other magnetic heads having a shortened magnetic circuit length and methods of production thereof are presented in additional embodiments.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: July 7, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Yohji Maruyama
  • Publication number: 20150154987
    Abstract: In one embodiment, a magnetic head includes a main pole configured to write data to a magnetic medium using a magnetic field, a return pole positioned above the main pole at a media-facing surface of the magnetic head, the return pole being configured to return magnetic flux from the main pole after it has exited a magnetic medium, and a coil configured to produce magnetic flux in the main pole, the coil being positioned below the return pole, wherein a film thickness of a first turn of the coil on a media-facing surface side thereof is less than a film thickness of a second turn of the coil. Other magnetic heads having a shortened magnetic circuit length and methods of production thereof are presented in additional embodiments.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 4, 2015
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Kimitoshi Etoh, Kazuhiko Hosomi, Mikito Sugiyama, Yohji Maruyama