Head Accessory Patents (Class 360/128)
  • Patent number: 10803891
    Abstract: An approach to a reduced-head hard disk drive (HDD) involves a load/unload (LUL) ramp subsystem that includes a ramp assembly that includes a translatable lever member and a LUL ramp member coupled thereto, and interconnected elevator interfaces coupled with the ramp by way of a set of flexures. The ramp subsystem is configured such that in response to a sufficient force being applied to the lever by the HSA, a distal end of the ramp is positioned so that an outer perimeter of a recording disk of an HDD is free of a channel at the distal end of the ramp. The subsystem may further include a motor configured to drive rotation of a lead screw to which the ramp assembly is attached, to drive vertical translation of the ramp assembly, thereby providing for loading the vertically-translatable HSA onto and off of each of the disks of a multiple-disk stack.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: October 13, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Jon Jacoby, David Myers
  • Patent number: 10580438
    Abstract: In one embodiment, an apparatus includes a module having an array of transducers and a heating element positioned proximate to the array of transducers. The heating element has opposite ends and a center portion therebetween, where the heating element is configured to produce more heat per unit length along the opposite ends than in the center portion.
    Type: Grant
    Filed: October 18, 2018
    Date of Patent: March 3, 2020
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Hugo E. Rothuizen
  • Patent number: 10559322
    Abstract: A diagnostic tape (318) for use with a tape drive (310) having a tape head (322) includes a first tape section (430A) and a second tape section (430B). The first tape section (430A) and the second tape section (430B) are configured to move across the tape head (322) during use of the tape drive (310). The first tape section (430A) includes a first patterned data code (432A) that is indicative of a first spacing between the tape head (322) and the first tape section (430A). The second tape section (430B) includes a second patterned data code (432B) that is indicative of a second spacing between the tape head (322) and the second tape section (430B). The second patterned data code (432B) is different than the first patterned data code (432A). The diagnostic tape (318) can further include a tape head cleaning section (630F) including abrasive material (650) that is configured to move across the tape head (322) to clean the tape head (322).
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: February 11, 2020
    Assignee: QUANTUM CORPORATION
    Inventors: James P. Peng, Turguy Goker, Hoa Le, Suayb S. Arslan, George A. Saliba
  • 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
  • Patent number: 10529364
    Abstract: Provided herein is a magnetic write head including a near field transducer and a magnetic recording media including a media lubricant. The media lubricant includes a first portion and a second portion. The second portion of the media lubricant is evaporated in response to heat emitted from the near field transducer. The second portion of the media lubricant that is evaporated removes a contaminant over the near field transducer.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: January 7, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: John L. Brand, James D. Kiely
  • Patent number: 10482913
    Abstract: A magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 ?m. The magnetic layer includes an abrasive, and the percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 ?m×6.3 ?m of the surface of the magnetic layer with respect to the total area of the region, obtained by plane observation performed by using a scanning electron microscope, is greater than or equal to 0.02% and less than 0.06%. Also, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: November 19, 2019
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 10475480
    Abstract: A magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support. The center line average surface roughness Ra measured regarding a surface of the magnetic layer is less than or equal to 1.8 nm. The contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°. Also, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is less than or equal to 0.060.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: November 12, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Norihito Kasada
  • Patent number: 10453488
    Abstract: A magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. The logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050, and the contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: October 22, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Norihito Kasada
  • Patent number: 10438621
    Abstract: A magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support. The thickness of the back coating layer is less than or equal to 0.30 ?m. The logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is less than or equal to 0.060. Further, the contact angle with respect to 1-bromonaphthalene measured regarding the surface of the back coating layer is 15.0° to 30.0°.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: October 8, 2019
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 10431250
    Abstract: A magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. The logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050, and ?SFD in a longitudinal direction of the magnetic tape calculated by Expression 1: ?SFD=SFD25° C.?SFD?190° C. is greater than or equal to 0.35. In Expression 1, the SFD25° C. is the switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. is the switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of ?190° C.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: October 1, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Toshio Tada, Norihito Kasada
  • Patent number: 10366715
    Abstract: A slider has a read transducer comprising first and second shields surrounding a read sensor. The first shield faces a substrate. A first end of the reader stack is at a media-facing surface of the slider and a second end of the reader stack faces away from the first end. A heater is located farther away from the media-facing surface than the second end of the read transducer. The heater is configured to control a thermal protrusion of the read transducer from the media-facing surface. A heat sink is located between the first shield and the substrate.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: July 30, 2019
    Assignee: Seagate Technology LLC
    Inventor: Vasudevan Ramaswamy
  • Patent number: 10249344
    Abstract: A system and method for corrosion protection of a tape drive. The system includes: the tape drive, a temperature sensor, a heating entity and a controller for activating the heating entity. The method includes: establishing, via the temperature sensor, temperature information indicative of a temperature in an area of, or within, the tape drive; receiving the temperature information at the controller; and activating the heating entity in a manner dependent on the temperature information established via the temperature sensor in order to prevent corrosion within the tape drive.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: April 2, 2019
    Assignee: International Business Machines Corporation
    Inventors: Ole Asmussen, Robert Beiderbeck, Erik Rueger, Markus Schaefer
  • Patent number: 10074626
    Abstract: A wafer laminate has an adhesive layer (2) sandwiched between a support (1) and a wafer (3), with a circuit-forming surface of the wafer facing the adhesive layer. The adhesive layer (2) includes a light-shielding resin layer (2a), an epoxy-containing siloxane skeleton resin layer (2b), and a non-silicone thermoplastic resin layer (2c).
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: September 11, 2018
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroyuki Yasuda, Michihiro Sugo
  • Patent number: 10026434
    Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: July 17, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Masahito Oyanagi, Norihito Kasada, Toshio Tada, Takuro Sugiyama
  • Patent number: 10026433
    Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and has a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein the combined thickness of the magnetic layer and the nonmagnetic layer is less than or equal to 0.80 ?m; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050 and the coefficient of friction as measured on a base portion of the surface on the magnetic layer side is less than or equal to 0.35.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: July 17, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 10026435
    Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side of the nonmagnetic support, wherein the backcoat layer is less than or equal to 0.30 ?m in thickness; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: July 17, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Takuro Sugiyama
  • Patent number: 9984710
    Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side thereof, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side is less than or equal to 0.060.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: May 29, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 9947344
    Abstract: An apparatus according to one embodiment includes an array of magnetic read transducers each having a current-perpendicular-to-plane sensor, magnetic shields on opposite sides of the sensor in an intended direction of media travel thereacross, and a stabilizing layered structure between at least one of the magnetic shields and the sensor. The stabilizing layered structure has an antiferromagnetic layer, a first ferromagnetic layer adjacent the antiferromagnetic layer, and a second ferromagnetic layer. The antiferromagnetic layer pins a magnetization direction in the first ferromagnetic layer along an antiferromagnetic polarized direction of the antiferromagnetic layer. An antiparallel coupling layer is positioned between the ferromagnetic layers such that a magnetization direction in the second ferromagnetic layer is opposite the magnetization direction in the first ferromagnetic layer.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: April 17, 2018
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Robert E. Fontana, Jr., Calvin S. Lo
  • Patent number: 9792932
    Abstract: This thin film magnetic head includes: a magnetic pole including a first end surface exposed on an air bearing surface; a coil configured to provide a magnetic flux passing through inside of the magnetic pole; and a heatsink including a second end surface that is provided at a position recessed from the air bearing surface. The second end surface is configured to suppress reflection causing light that has traveled through an entering position on the air bearing surface to return to the entering position.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: October 17, 2017
    Assignee: TDK CORPORATION
    Inventors: Katsuki Kurihara, Mutsumi Fujita, Yosuke Antoku
  • Patent number: 9685201
    Abstract: A system according to one embodiment includes a magnetic structure having a tunnel junction, and a controller and logic integrated with and/or executable by the controller. The logic is configured to reduce a local relative humidity in a vicinity of the tunnel junction by passing a current through the tunnel junction for at least a period of time that the tunnel junction would otherwise not have a current passing therethrough. A method according to one embodiment includes determining a relative humidity in an environment of a tunnel junction that is part of a magnetic structure and selecting an operating current from a range of allowable operating currents based on the determined relative humidity. The selected level of the current is high enough to heat the tunnel junction to a temperature which reduces a local relative humidity in a vicinity of the tunnel junction.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: June 20, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Icko E. T. Iben, Lee C. Randall
  • Patent number: 9564163
    Abstract: A method, apparatus, and system are provided for implementing dual partially independent flyheight control (TFC) for hard disk drives (HDDs). A dual thermal flyheight control (TFC) includes a series connected first heater resistor and a second heater resistor connected between a pair of wires. A capacitor is connected in parallel with the first heater resistor providing a frequency dependent shunt to the parallel connected first heater resistor. TFC electrical bias signals are applied to the first heater resistor and second heater resistor carried by the pair of wires. For example, the TFC electrical bias signals include high frequency electrical signals including a frequency range between 1 MHz and 100 MHz having a set amplitude in a voltage range between 0 and 7 Volts, and/or DC current signal.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: February 7, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Contreras, Ian Robson McFadyen, Erhard Schreck
  • Patent number: 9521278
    Abstract: A magnetic data processing device includes a magnetic head configured to read data from or write data to a magnetic stripe extending in a first direction on a medium, while moving in the first direction, a pad facing the magnetic head and extending in the first direction, and a controller configured to cause the pad to be in contact with the magnetic head and cause the magnetic head to move in the first direction while being in contact with the pad.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: December 13, 2016
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Toshiharu Sekino
  • Patent number: 9437230
    Abstract: A micro-milliactuator, a micro-microactuator, an actuator arm assembly, a hard disk drive and a method for operation of the hard disk are provided. In accordance with one aspect, the actuator arm assembly includes an arm, a slider for reading and writing information to disk media in response to read/write signals, and an actuator selected from the group comprising a micro-milliactuator and a micro-microactuator. The actuator has the slider mounted thereon and supports it above the disk media. The actuator includes one or more piezoelectric actuators for horizontally shifting the slider in response to actuator control signals. The actuator further includes one or more sensors physically coupled thereto for vibration sensing, compensation and suppression, the one or more sensors generating sensor signals in response to sensed vibrations during operation, wherein the actuator control signals are generated at least partially in response to the sensor signals.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: September 6, 2016
    Assignee: Marvell International LTD.
    Inventor: Michael Hatch
  • Patent number: 9355661
    Abstract: A magnetic recording apparatus includes a write element and an optical device for heating a portion of a magnetic medium. The optical device and the write element are arranged to generally prevent the write element from affecting the optical fields generated by the optical device.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: May 31, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Michael Allen Seigler, Sharat Batra, William Albert Challener, Hua Zhou
  • Patent number: 9330691
    Abstract: According to one embodiment, a microwave assisted magnetic head includes a spin torque oscillator, and if driving current of the spin torque oscillator is zero, a magnetization direction of the spin injection layer is identical regardless of polarity of recording current, and if the driving current of the spin torque oscillator is not zero, the magnetization direction of the spin injection layer changes in response to the polarity of the recording current.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: May 3, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoyuki Narita, Kenichiro Yamada, Tomoko Taguchi, Takuya Matsumoto
  • Patent number: 9290580
    Abstract: Articles that contain a solid support with a grafted chain extending from the solid support, methods of making these articles, and various uses of the articles are described. More specifically, the grafted chain has a functional group that can react with or interact with target compound. Alternatively, the functional group on the grafted chain can react with a modifying agent to provide another group that can react with or interact with the target compound. The grafted chains are attached to the solid support through a ring-opened azlactone group. The articles can be used to purify the target compound or to separate the target compound from other molecules in a sample.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: March 22, 2016
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Simon K. Shannon, Catherine A. Bothof, Babu N. Gaddam, Jerald K. Rasmussen, Richard B. Ross
  • Patent number: 9224416
    Abstract: An apparatus that includes a near field transducer, the near field transducer including an electrically conductive nitride.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: December 29, 2015
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Sarbeswar Sahoo, Michael Christopher Kautzky, Amit Vasant Itagi
  • Patent number: 9202528
    Abstract: Embodiments of the present invention generally relate to a microwave assisted magnetic recording (MAMR) head. The MAMR head includes a main pole, a trailing shield, and a spin torque oscillator (STO) disposed between the main pole and the trailing shield. The STO is recessed from an air bearing surface.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: December 1, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Masaru Furukawa, Jianhua Li, Masato Matsubara, Masato Shiimoto
  • Patent number: 9202484
    Abstract: Embodiments disclosed herein generally relate to a MAMR head. The MAMR head includes an STO. The STO has a first surface at a media facing surface, and a portion of the first surface has a trapezoidal shape. Having this configuration, the acute angles of the trapezoidal shaped portion provide a greater width of the STO at the media facing surface, which protect the main pole from over-etching during the fabrication of the STO. In addition, the acute angles of the trapezoidal shaped portion of the first surface are large enough to keep a low STO driving voltage and provide the MAMR head with a long operation lifetime and higher reliability.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: December 1, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Katsuro Watanabe, Kenji Sugiura, Yuta Udo
  • Patent number: 9196275
    Abstract: An apparatus for a magnetic storage drive includes a magnetic head assembly having a first slider and a second slider arranged with a gap between the first and second sliders, the first slider comprising a first magnetic head and the second slider comprising a second magnetic head. The apparatus includes a ramp constructed of a first material, the ramp being configured to guide and hold the magnetic head assembly in place when parked; and a fin constructed of a second material different than the first material, the fin arranged with the ramp to protect the first slider from contacting the second slider when the magnetic head assembly is parked on the ramp.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: November 24, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Marc Davidson, David K. Myers, Terrance J. Willis
  • Patent number: 9177573
    Abstract: A tunneling magnetoresistance (TMR) device has a thin MgO tunneling barrier layer and a free ferromagnetic multilayer. The free ferromagnetic multilayer includes a CoFeB first ferromagnetic layer, a face-centered-cubic (fcc) NiFe compensation layer with negative magnetostriction, and a body-centered-cubic (bcc) NiFe insertion layer between the CoFeB layer and the fcc NiFe compensation layer. An optional ferromagnetic nanolayer may be located between the MgO barrier layer and the CoFeB layer. An optional amorphous separation layer may be located between the CoFeB layer and the bcc NiFe insertion layer. The bcc NiFe insertion layer (and the optional amorphous separation layer if it is used) prevents the fcc NiFe layer from adversely affecting the crystalline formation of the MgO and CoFeB layers during annealing. The bcc NiFe insertion layer also increases the TMR and lowers the Gilbert damping constant of the free ferromagnetic multilayer.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: November 3, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Sangmun Oh, Zheng Gao
  • Patent number: 9153249
    Abstract: An apparatus for measuring cross-talk in an array reader magnetic storage system includes an array reader with multiple read heads operable to read data from a magnetic storage medium, a first preamplifier connected to a first read head, a second preamplifier connected to a second read head, and a cross-talk measurement circuit connected to the first preamplifier and to the second preamplifier, operable to measure cross-talk between a first signal from the first read head and a second signal from the second read head.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: October 6, 2015
    Assignee: LSI Corporation
    Inventors: Travis Oenning, Ross S. Wilson, David W. Kelly, Jason S. Goldberg
  • Patent number: 9147432
    Abstract: A head cleaning device includes: a wiper member formed in an elongate shape and having a wiper anchoring portion anchored so as not to move in a tape width direction; and a support member that includes a wiper entrainment portion about which the wiper member is entrained so as to double back, that causes the wiper entrainment portion to move in the tape width direction so that a surface of the wiper member at an opposite side of the wiper entrainment portion from the wiper anchoring portion wipes a head that performs at least one of writing information to, or reading information from, a recording tape.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: September 29, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Teruo Ashikawa
  • Patent number: 9064542
    Abstract: A disk drive includes: a disk, a head, and control circuitry including a servo control system operable to actuate the head. The head is unloaded onto a ramp for a period of time based on a time constant. The head is loaded onto the disk after the period of time has elapsed and head-media spacing (HMS) is repeatedly measured. The head is unloaded when the HMS measurements become constant within a predetermined range.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: June 23, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventor: Ralf Brunner
  • Publication number: 20150124353
    Abstract: Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO and an embedded contact sensor (ECS). The STO and the ECS are electrically connected in series and are connected to the same terminals. During operation, the current applied to the STO is controlled with respect to a change in resistance of the ECS.
    Type: Application
    Filed: November 6, 2013
    Publication date: May 7, 2015
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Kenichiro TAKAHASHI, Junguo XU, Jianhua LI, Masaru FURUKAWA
  • Patent number: 9007721
    Abstract: A spin torque oscillator is provided which is adapted to high data transfer rates and which can perform assisted magnetic recording of sufficient magnitude. A spin torque oscillator is provided with a stacked spin injection layer and a high frequency magnetic field generation layer. The stacked spin injection layer has a stacked structure in which a first magnetic layer, a coupling layer, and a second magnetic layer are stacked in the order mentioned from a far side as viewed from the high frequency magnetic field generation layer. Magnetization of the first magnetic layer and magnetization of the second magnetic layer are coupled antiparallel to each other. A polarity of the magnetization of the second magnetic layer is reversed temporally earlier than a magnetic field polarity reversal of a leakage magnetic field from the main magnetic pole.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: April 14, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Yo Sato, Katsuro Watanabe, Keizou Katou, Masukazu Igarashi
  • Patent number: 9007724
    Abstract: Embodiments disclosed herein generally relate to the data storage field and hard disk drives (HDD) using microwave assisted magnetic recording (MAMR) technology. Aspects of the preferred embodiments are to prevent the breakdown of spin torque oscillators (STO) due to large amounts of current flowing through the STO during head/disk contact. A magnetic head slider is disposed above and spaced apart from a disk. A STO is formed on a section of the magnetic head slider. Two electrodes are coupled to the STO, and one electrode has a higher potential than the other electrode. A preamplifier is adapted to send a current through the two electrodes, resulting in the higher potential electrode protruding closer to the disk than the lower potential electrode. Current then flows from one electrode to the disk without flowing through the STO, and breakdown of the STO is prevented.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: April 14, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Masaru Furukawa, Junguo Xu, Masato Shiimoto, Jianhua Li
  • Patent number: 9001466
    Abstract: According to one embodiment, a three-dimensional magnetic recording and reproducing apparatus includes a magnetic head and a magnetic storage medium. The magnetic head includes a spin-torque oscillator including a free layer, a non-magnetic layer and a fixed layer, magnetization of the free layer being rotatable, the non-magnetic layer being laminated on the free layer, the fixed layer being laminated on the non-magnetic layer, a magnetization direction of the fixed layer being fixed. The magnetic storage medium includes first magnetic layers formed of magnetic materials having different resonant frequencies, each of the first magnetic layers being formed of an in-plane magnetization film and having recording tracks.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: April 7, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Rie Sato, Koichi Mizushima, Tazumi Nagasawa, Kiwamu Kudo
  • Publication number: 20150029609
    Abstract: A spin valve element according to an embodiment includes: a nonmagnetic base layer; a first terminal including a first magnetic layer connecting to a portion near one of opposing end faces of the nonmagnetic base layer; a second terminal including a second magnetic layer disposed and connecting to the nonmagnetic base layer so as to be at a distance from the first terminal; a third terminal including a third magnetic layer disposed and connecting to the nonmagnetic base layer so as to be at distances from the first and second terminals, the second terminal and the third terminal connecting to a current source that passes a sense current, and the first terminal and one of the second terminal and the third terminal connecting to a voltage detection unit that detects a voltage.
    Type: Application
    Filed: July 23, 2014
    Publication date: January 29, 2015
    Inventors: Yuuzo KAMIGUCHI, Satoshi SHIROTORI, Shinobu SUGIMURA, Masayuki TAKAGISHI, Hitoshi IWASAKI
  • Patent number: 8908330
    Abstract: A microwave assisted magnetic recording (MAMR) write head includes a write pole tip, a trailing shield, and a spin torque oscillator between the write pole tip and the trailing shield. The spin torque oscillator may have a substantially cylindrical member and a non-cylindrical member extending from the substantially cylindrical member toward an air bearing surface (ABS). The non-cylindrical member may have a substantially rectangular and/or flat surface facing the ABS. Alternatively, the spin torque oscillator may include a substantially cylindrical member with a rectangular and/or flat surface facing the ABS that is lapped into the substantially cylindrical member.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: December 9, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventor: Michael L. Mallary
  • Patent number: 8842389
    Abstract: A perpendicular magnetic recording (PMR) head is fabricated with a main pole shielded laterally by a pair of side shields, shielded above by a trailing shield and shielded optionally below by a leading shield. The shields and the seed layers on which they are formed are formed of materials having substantially the same physical characteristics including the same material composition, the same hardness, the same response to processes such as ion beam etching (IBE), chemical mechanical polishing (CMP), mechanical lapping, such as the slider ABS lapping, the same coefficient of thermal expansion (CTE) as well as the same Bs. Optionally, the trailing shield may be formed on a high Bs seed layer to provide the write head with improved down-track performance.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: September 23, 2014
    Assignee: Headway Technologies, Inc.
    Inventors: Zhigang Bai, Yan Wu, Moris Dovek, Cherng Chyi Han
  • Publication number: 20140268422
    Abstract: A data reader and associated method of making are generally provided. A data reader capable of sensing adjacent data bits may be configured at least with a magnetic stack disposed between first and second side shields. Each side shield may have a polish stop layer that is tuned to provide a first predetermined polish rate.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: Seagate Technology LLC
    Inventors: Shaun Eric McKinlay, Eric W. Singleton, Carolyn Pitcher Van Dorn, Levent Colak, Thu-Van Thi Nguyen
  • Publication number: 20140268410
    Abstract: A temperature sensor of a head transducer measures temperature near or at the close point. The measured temperature varies in response to changes in spacing between the head transducer and a magnetic recording medium. A detector is coupled to the temperature sensor and is configured to detect a change in a DC component of the measured temperature indicative of onset of contact between the head transducer and the medium. Another head transducer configuration includes a sensor having a sensing element with a high temperature coefficient of resistance to interact with asperities of the medium. Electrically conductive leads are connected to the sensing element and have a low temperature coefficient of resistance relative to that of the sensing element, such thermally induced resistance changes in the leads have a negligible effect on a response of the sensing element to contact with the asperities.
    Type: Application
    Filed: May 27, 2014
    Publication date: September 18, 2014
    Applicant: Seagate Technology LLC
    Inventors: Gary Joseph Kunkel, Huazhou Lou, Declan Macken, Timothy William Stoebe
  • Patent number: 8837082
    Abstract: A module according to one embodiment includes a plurality of transducers; a tape bearing surface having a transducer region aligned with the transducers in a tape travel direction, and outer regions flanking the transducer region in a direction perpendicular to the tape travel direction; a first coating on the transducer region of the tape bearing surface; and a second coating on at least one of the outer regions of the tape bearing surface, the second coating being different than the first coating.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: September 16, 2014
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 8837075
    Abstract: A head assembly including one or more transducer elements for controlling head-media spacing is disclosed. The assembly includes detection circuitry configured to receive an input detection signal responsive to the spacing between the head and the data storage media and provide an output measure indicative of the head-media spacing. The output signal is utilized by control circuitry to provide a control input to one of a plurality of transducer elements on the head to protrude a localized portion of the head to adjust head-media spacing.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: September 16, 2014
    Assignee: Seagate Technology LLC
    Inventors: Jorge Vicente Hanchi, Dian Song, John Stuart Wright, Andrew D. White
  • Patent number: 8837086
    Abstract: A magnetic recording head used for microwave-assisted magnetic recording includes: a main pole; a spin torque oscillator provided on the main pole, including a high-speed rotating magnetization layer in which the magnetization is rapidly rotated by a spin torque; a trailing shield provided on the spin torque oscillator; and a sub pole magnetically coupled to the trailing shield provided in a medium-facing surface, extending in a vertical direction to the medium-facing surface. Then, a non-magnetic electrode is provided on the outside of a trailing gap in which the spin torque oscillator is provided with respect to a magnetic material of the main pole, the trailing shield, or the sub pole, to prevent the line resistance variation due to the AMR effect or the eddy current. Thus, the variation of the current flowing to the spin torque oscillator can be controlled to achieve stable oscillation.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: September 16, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Yuta Udo, Katsuro Watanabe
  • Publication number: 20140218823
    Abstract: A magnetic element is generally provided that can be implemented as a data reader. Various embodiments may connect a magnetic stack to a top shield and separate the magnetic stack from a bi-layer side shield. The bi-layer side shield may have a fixed magnetization layer and a soft magnetic layer each magnetically isolated from the top shield.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 7, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Shaun Eric McKinlay, Zhiguo Ge, Eric Walter Singleton, Mohammed Shariat Ullah Patwari, Victor Boris Sapozhnikov
  • Publication number: 20140177102
    Abstract: In accordance with one embodiment, a multi-reader can be manufactured so as to be able to read from multiple regions of a storage device contemporaneously during operation.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Mark T. Kief, Thomas Roy Boonstra
  • Patent number: 8760806
    Abstract: With respect to microwave assisted magnetic recording, high-density information recording is performed by forming a favorable write magnetic domain on a recording medium. The recording medium is placed in a magnetically resonant state by generating a microwave, and information is recorded. A recording medium 7 comprises parts 17 and 18 with differing magnetic anisotropy fields. Recording is performed using, for the frequency of the microwave, a frequency that places the part 17, which has smaller magnetic anisotropy, in a resonant state. Recording density of an information recording apparatus can be increased, while at the same time also improving reliability. Consequently, it becomes possible to reduce costs.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: June 24, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masukazu Igarashi, Harukazu Miyamoto
  • Publication number: 20140168812
    Abstract: In one embodiment, a magnetic head includes a first shield; a spin torque oscillator (STO) sensor positioned above the first shield, the STO sensor comprising a reference layer and a free layer positioned above the reference layer; and at least one shield positioned in a plane that is parallel with a media-facing surface of the STO sensor, the plane also intersecting the STO sensor, wherein one or more of the at least one shield comprises a highly magnetically permeable material that is exchange decoupled and electrically decoupled from the STO sensor. Other magnetic heads, systems, and methods for producing the magnetic heads are described according to more embodiments.
    Type: Application
    Filed: December 13, 2012
    Publication date: June 19, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Patrick M. Braganca, Bruce A. Gurney, Yang Li