Patents by Inventor Kazuki Sato

Kazuki Sato 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).

  • Magnetic head for perpendicular magnetic recording having a main pole and a shield
    Patent number: 8896967
    Abstract: A magnetic head includes a coil, a main pole, a write shield, and first and second yoke layers. The first and second yoke layers are magnetically connected to the write shield and aligned along the direction of travel of a recording medium such that the main pole is interposed therebetween. The coil includes a winding portion of planar spiral shape that is formed in one or more layers. The magnetic head further includes: a first coupling part located away from the medium facing surface and magnetically coupling the main pole and the second yoke layer to each other; and a second coupling part located away from the medium facing surface and magnetically coupling the first yoke layer and the second yoke layer to each other without touching the main pole. The winding portion is wound around the first coupling part, and a part of the winding portion passes between the first and second coupling parts.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: November 25, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Atsushi Iijima
  • Magnetic head for perpendicular magnetic recording having a main pole and a shield
    Patent number: 8867169
    Abstract: A magnetic head includes a magnetic structure incorporating a write shield. The magnetic structure is formed to include a first magnetic layer, a second magnetic layer stacked on the first magnetic layer, and a seed layer. The first magnetic layer has a front end face located in the medium facing surface and a top surface. The second magnetic layer has a front end face located in the medium facing surface and a bottom surface. The top surface of the first magnetic layer includes a first region including an end located in the medium facing surface and a second region farther from the medium facing surface than the first region. The seed layer is not present on the first region of the top surface of the first magnetic layer but is present on the second region.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: October 21, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Yukinori Ikegawa, Atsushi Iijima, Tatsuya Shimizu
  • Magnetic head for perpendicular magnetic recording including a heater
    Patent number: 8837083
    Abstract: A magnetic head includes a main pole, a return path section, a heater for heating the main pole, and a metal portion. The metal portion is isolated from the return path section and disposed such that the heater is interposed between the main pole and the metal portion. The return path section has a contact surface in contact with the main pole. The metal portion is located farther from the medium facing surface than is the contact surface. The main pole and the metal portion define therebetween a receiving space for receiving at least part of the heater. The at least part of the heater is received in the receiving space.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: September 16, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Magnetic head for perpendicular magnetic recording including a heater
    Patent number: 8837089
    Abstract: A magnetic head includes a main pole and a heater for heating the main pole. The main pole is shaped to have a receiving space formed therein for receiving at least part of the heater. The at least part of the heater is received in the receiving space. The main pole includes a first layer and a second layer stacked. The receiving space is sandwiched between the first layer and the second layer.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: September 16, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H. K. ) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Thin-film magnetic head with improved wide area track erasure (WATE), method of manufacturing the same, head gimbal assembly, and hard disk drive
    Patent number: 8824102
    Abstract: A thin-film magnetic head includes a main magnetic pole layer, write shield layer, gap layer, and thin-film coils, which are laminated on a substrate. A return magnetic pole layer is spaced from the medium-opposing surface on the side opposite to the write shield layer with the main magnetic pole layer intervening therebetween. A connecting magnetic layer is formed using a magnetic material to connect the return magnetic pole layer to the write shield layer on the side closer to the medium-opposing surface than is the thin-film coil. The thin-film coil is wound as a flat spiral around the write shield layer. A part of the thin-film coil wound as the flat spiral is disposed only at a position distanced from the substrate than is the main magnetic pole layer.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: September 2, 2014
    Assignees: Headway Technologies, Inc., Sae Magntics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Atsushi Iijima
  • Magnetic head for perpendicular magnetic recording having two coils
    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
  • Magnetic head for perpendicular recording having a plurality of magnetic path portions
    Patent number: 8792209
    Abstract: A magnetic head includes a coil, a main pole, a write shield, and a return path section. The return path section includes a yoke layer located on the front side in the direction of travel of a recording medium relative to the main pole, and a coupling part coupling the main pole and the yoke layer to each other. The coupling part includes a plurality of magnetic path portions that separate a magnetic flux into a plurality of fluxes and allow the fluxes to pass therethrough in parallel. The coil includes a plurality of winding portions disposed around the plurality of magnetic path portions, respectively.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: July 29, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Hironori Araki, Tatsuya Shimizu
  • Magnetic head for perpendicular magnetic recording having a return path section
    Patent number: 8792207
    Abstract: A magnetic head includes a coil, a main pole, and a return path section. The return path section includes a coil surrounding portion located on the front side in the direction of travel of a recording medium relative to the main pole and provided for forming a coil receiving space, and a connecting portion connecting the main pole and the coil surrounding portion to each other. The connecting portion has a contact surface in contact with the main pole. The coil receiving space is a space defined by a first virtual plane intersecting the contact surface and parallel to a medium facing surface, a second virtual plane including the contact surface and perpendicular to the direction of travel of the recording medium, and the coil surrounding portion. The coil includes a portion received in the coil receiving space.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: July 29, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Magnetic head for perpendicular magnetic recording having a return path section
    Patent number: 8780497
    Abstract: A magnetic head includes first and second coils, a main pole, a write shield, a return path section, and a core part. The return path section includes a yoke part magnetically connected to the write shield, and a coupling part located away from a medium facing surface and magnetically coupling the yoke part and the main pole to each other. The first coil is located on the front side in the direction of travel of a recording medium relative to the main pole and wound around the coupling part. The core part is located farther from the medium facing surface than is the coupling part, and is magnetically connected to the main pole. The second coil is located on the front side in the direction of travel of the recording medium relative to the main pole and wound around the core part.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: July 15, 2014
    Assignees: Headway Technologies Inc., SAE Magnetics (H.K) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Seiichiro Tomita, Hironori Araki, Tatsuya Shimizu
  • Magnetic head for perpendicular magnetic recording having two side shields
    Patent number: 8767347
    Abstract: A main pole has an end face located in a medium facing surface, and first through sixth side surfaces. The first and third side surfaces are connected to the end face of the main pole. The second and fourth side surfaces are located farther from the medium facing surface than are the first and third side surfaces. The fifth side surface connects the first side surface to the second side surface. The sixth side surface connects the third side surface to the fourth side surface. The distance between the first side surface and the third side surface decreases with increasing proximity to the top surface of the substrate. The shape of the first side surface is defined by a first side shield. The shape of the third side surface is defined by a second side shield.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: July 1, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Kazumasa Yasuda, Tatsuya Shimizu
  • Magnetoresistive sensor with funnel-shaped free layer, magnetic head, head gimbal assembly, and disk drive unit with the same
    Patent number: 8767356
    Abstract: An MR sensor includes a first shielding layer, a second shielding layer, an MR element formed therebetween, and a pair of hard magnet layers respectively placed on two sides of the MR element. The MR element includes an AFM layer formed on the first shielding layer, a pinned layer formed on the AFM layer and a free layer formed between the pinned layer and the second shielding layer. The free layer is funnel-shaped, which has a first edge facing an air bearing surface and a second edge opposite the first edge, and the first edge has a narrower width than that of the second edge. The MR sensor can improve MR height control performance, and improve the ESD performance and decrease the PCN and RTN and, in turn, get a more stable performance. The present invention also discloses a magnetic head, an HGA and a disk drive unit.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: July 1, 2014
    Assignees: SAE Magnetics (H.K.) Ltd., TDK Corporation
    Inventors: Chiuming Leung, Kosuke Tanaka, Kazuki Sato, Cheukwing Leung, Juren Ding, Rongkwang Ni, Wanyin Kwan, Mankit Lee
  • MAGNETIC HEAD FOR PERPENDICULAR RECORDING HAVING A PLURALITY OF MAGNETIC PATH PORTIONS
    Publication number: 20140177099
    Abstract: A magnetic head includes a coil, a main pole, a write shield, and a return path section. The return path section includes a yoke layer located on the front side in the direction of travel of a recording medium relative to the main pole, and a coupling part coupling the main pole and the yoke layer to each other. The coupling part includes a plurality of magnetic path portions that separate a magnetic flux into a plurality of fluxes and allow the fluxes to pass therethrough in parallel. The coil includes a plurality of winding portions disposed around the plurality of magnetic path portions, respectively.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Kazuki SATO, Shigeki TANEMURA, Hironori ARAKI, Tatsuya SHIMIZU
  • Magnetic head for perpendicular magnetic recording with shield around main pole
    Patent number: 8749919
    Abstract: A magnetic head includes a shield, and first and second return path sections. The shield has an end face that is located in a medium facing surface to wrap around an end face of a main pole. The shield includes a bottom shield, two side shields, and a top shield. The first return path section is magnetically connected to the bottom shield and is greater than the bottom shield in length in a direction perpendicular to the medium facing surface. The second return path section magnetically couples the top shield and the main pole to each other. The coil includes a first portion that passes through a space defined by the main pole and the first return path section, and a second portion that passes through a space defined by the main pole and the second return path section.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: June 10, 2014
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Atsushi Iijima
  • Method of manufacturing magnetic head for perpendicular magnetic recording having a return path section
    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
  • Thermally-assisted magnetic recording head having expanded near-field light generating layer and method of manufacture
    Patent number: 8619518
    Abstract: A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The optical waveguide has a waveguide end face arranged within the medium-opposing surface and an upper end face on a side closer to the main magnetic pole layer. The thermally assisted magnetic head has an interposed layer which is in direct contact with an outer surface of the optical waveguide. The near-field light generating layer has a near-field light generating part having the generating end part and an expanded part connected with the near-field light generating part. The expanded part has a base part arranged above the upper end face of the optical waveguide and extended base part connected with the base part.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: December 31, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Hironori Araki, Shigeki Tanemura, Kazuki Sato, Ryuji Fujii
  • Thermally-assisted magnetic recording head having a plasmon generator
    Patent number: 8619517
    Abstract: A thermally-assisted magnetic recording head includes a waveguide having a core and a cladding, and a plasmon generator. The core has an evanescent light generating surface. The plasmon generator has a plasmon exciting part opposed to the evanescent light generating surface. Assuming a virtual straight line that passes internally through the core and that is parallel to the direction of travel of light propagating through the core, at least part of the evanescent light generating surface and at least part of the plasmon exciting part are both inclined relative to the virtual straight line such that the distance from the virtual straight line decreases with increasing proximity to the medium facing surface.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: December 31, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Hironori Araki
  • Thermally-assisted magnetic recording head having a plasmon generator
    Patent number: 8614932
    Abstract: A plasmon generator has a near-field light generating part located between an end face of a main pole located in a medium facing surface and an end face of a shield located in the medium facing surface. A waveguide has a core having a front end face facing toward the medium facing surface. The front end face has first and second end portions located at opposite ends in the direction of travel of a recording medium. The first end portion is located closer to the near-field light generating part than is the second end portion. Either a main pole or a shield overlaps only a region of the front end face of the core when viewed in a direction perpendicular to the medium facing surface, the region extending from a midpoint position between the first and second end portions to the first end portion.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: December 24, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Hironori Araki
  • MAGNETIC HEAD FOR PERPENDICULAR MAGNETIC RECORDING HAVING A RETURN PATH SECTION
    Publication number: 20130329319
    Abstract: A magnetic head includes first and second coils, a main pole, a write shield, a return path section, and a core part. The return path section includes a yoke part magnetically connected to the write shield, and a coupling part located away from a medium facing surface and magnetically coupling the yoke part and the main pole to each other. The first coil is located on the front side in the direction of travel of a recording medium relative to the main pole and wound around the coupling part. The core part is located farther from the medium facing surface than is the coupling part, and is magnetically connected to the main pole. The second coil is located on the front side in the direction of travel of the recording medium relative to the main pole and wound around the core part.
    Type: Application
    Filed: June 11, 2012
    Publication date: December 12, 2013
    Applicants: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Kazuki SATO, Seiichiro TOMITA, Hironori ARAKI, Tatsuya SHIMIZU
  • Magnetic head for perpendicular magnetic recording capable of producing a write magnetic field of sufficient magnitude from the main pole while reducing the length of a magnetic path that connects the write shield and the main pole
    Patent number: 8593762
    Abstract: A magnetic head includes a coil, a main pole, a write shield, first and second yoke layers, and first and second coupling parts. The first yoke layer is located on the trailing side relative to the main pole whereas the second yoke layer is located on the leading side relative to the main pole. The first coupling part couples the main pole and the first yoke layer to each other. The second coupling part couples the first yoke layer and the second yoke layer to each other. The first coupling part includes a plurality of first magnetic path portions, and the second coupling part includes a plurality of second magnetic path portions. The coil includes one winding portion extending to pass around the first and second magnetic path portions alternately in a zigzag manner.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: November 26, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Kazuki Sato, Shigeki Tanemura, Hironori Araki, Tatsuya Shimizu
  • MAGNETIC HEAD FOR PERPENDICULAR MAGNETIC RECORDING HAVING A MAIN POLE AND A SHIELD
    Publication number: 20130308227
    Abstract: A magnetic head includes a magnetic structure incorporating a write shield. The magnetic structure is formed to include a first magnetic layer, a second magnetic layer stacked on the first magnetic layer, and a seed layer. The first magnetic layer has a front end face located in the medium facing surface and a top surface. The second magnetic layer has a front end face located in the medium facing surface and a bottom surface. The top surface of the first magnetic layer includes a first region including an end located in the medium facing surface and a second region farther from the medium facing surface than the first region. The seed layer is not present on the first region of the top surface of the first magnetic layer but is present on the second region.
    Type: Application
    Filed: May 16, 2012
    Publication date: November 21, 2013
    Applicants: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka SASAKI, Hiroyuki ITO, Shigeki TANEMURA, Kazuki SATO, Yukinori IKEGAWA, Atsushi IIJIMA, Tatsuya SHIMIZU