Storage Or Retrieval By Simultaneous Application Of Diverse Types Of Electromagnetic Radiation Patents (Class 369/13.01)
  • Patent number: 10127939
    Abstract: A magnetic recording medium includes a substrate, a first heat sink layer, a barrier layer, a second heat sink layer, and a magnetic layer that are successively stacked. The magnetic layer is made of a material including a first main component that is an alloy having a L10 crystal structure and a content of 50 at % or higher, or content of 50 mol % or higher. The barrier layer is made of a material including a second main component that is one of an oxide, a nitride, and a carbide having a content of 50 at % or higher, or content of 50 mol % or higher.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: November 13, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Kazuya Niwa, Lei Zhang, Yuji Murakami, Hisato Shibata, Takayuki Fukushima, Takehiro Yamaguchi, Tetsuya Kanbe
  • Patent number: 10002626
    Abstract: A waveguide core extends from an input coupler towards a media-facing surface of a read/write head. A cap is located between a terminating end of the waveguide core and the media-facing surface. The cap is formed of a high index of refraction, high-corrosion resistant material that is different than a material used to form the waveguide core. A near-field transducer is proximate the cap in a down-track direction. A head overcoat on the media-facing surface covers the cap.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: June 19, 2018
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Chubing Peng, Tae-Woo Lee, Xiaoyue Huang, Song Chen
  • Patent number: 9767468
    Abstract: Exemplary systems, methods, and computer-accessible mediums can be provided to manage a preferences associated with a user, which can include receiving information related the preferences of a user(s), determining if an inference(s) about the user(s) can be drawn from the preferences to generate further data, remove a particular preference from the preferences based on the further data, further determining if the inference(s) continues to be drawn.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: September 19, 2017
    Assignee: New York University
    Inventor: Foster Provost
  • Patent number: 9691416
    Abstract: A magnetic write head having a heat sink structure located adjacent to a trailing magnetic shield. The heat sink structure prevents heat generated by the magnetic oscillator current from causing damage to and reducing reliability of the magnetic write head. The trailing magnetic shield is substantially aligned with the magnetic oscillator, allowing the heat sink structure to wrap around the sides and back of the trailing magnetic shield and to provide good heat conduction away from the write pole, magnetic oscillator and trailing magnetic shield. The heat sink structure can be constructed of a material such as Ru, TiN, Cu, Au, Ag and AlN, and is preferably constructed of Au, which has excellent thermal properties.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: June 27, 2017
    Assignee: Western Digital Technologies, INC.
    Inventors: Takahiko Izawa, Hideaki Tanaka, Yoshinori Takeuchi
  • Patent number: 9502065
    Abstract: Various magnetic stack embodiments may be constructed with a soft magnetic underlayer (SUL) having a first thickness disposed between a substrate and a magnetic recording layer. A heatsink may have a second thickness and be disposed between the SUL and the magnetic recording layer. The first and second thicknesses may each be tuned to provide predetermined thermal conductivity and magnetic permeability throughout the data media.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: November 22, 2016
    Assignee: Seagate Technology LLC
    Inventors: KaiChieh Chang, Xiaobin Zhu, Yinfeng Deng, Ganping Ju, Timothy J. Klemmer, Yukiko Kubota, Thomas P. Nolan, YingGuo Peng, Jan-Ulrich Thiele, Qihong Wu
  • Patent number: 9483208
    Abstract: A data storage apparatus includes a primary storage device and a secondary storage device. The primary storage device includes a first non-volatile memory to store a content item. The secondary storage device includes a second non-volatile memory to store a command received from a first content appliance. The command indicates an operation to be performed with respect to the content item stored at the primary storage device. The secondary storage device is configured to send the command to a second content appliance for execution.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: November 1, 2016
    Assignee: SANDISK IL LTD.
    Inventor: Mordechai Teicher
  • Patent number: 9412402
    Abstract: Devices that include a near field transducer (NFT); a gas barrier layer positioned on at least a portion of the NFT; and a wear resistance layer positioned on at least a portion of the gas barrier layer wherein the gas barrier layer includes tantalum oxide (TaO), titanium oxide (TiO), chromium oxide (CrO), silicon oxide (SiO), aluminum oxide (AlO), titanium oxide (TiO), zirconium oxide (ZrO), yttrium oxide (YO), magnesium oxide (MgO), beryllium oxide (BeO), niobium oxide (NbO), hafnium oxide (HfO), vanadium oxide (VO), strontium oxide (SrO), or combinations thereof; silicon nitride (SiN), aluminum nitride (Al), boron nitride (BN), titanium nitride (TiN), zirconium nitride (ZrN), niobioum nitride (NbN), hafnium nitride (HfN), chromium nitride (CrN), or combinations thereof; silicon carbide (SiC), titanium carbide (TiC), zirconium carbide (ZrC), niobioum carbide (NbC), chromium carbide (CrC), vanadium carbide (VC), boron carbide (BC), or combinations thereof; or combinations thereof.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: August 9, 2016
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Scott Franzen, Ed F. Rejda, Kurt W. Wierman, Michael Allen Seigler
  • Patent number: 9318142
    Abstract: A transducer comprises a slider and a laser arrangement. The laser arrangement is configured to heat a region of a magnetic medium in proximity to the slider and produce modulated laser light to cause heat-induced modulation of the slider. The laser arrangement is configured to couple laser light at a power that reduces a coercivity of magnetic material at the region for writing data to or erasing data at the region, and couple modulated laser light to cause heat-induced modulation of the slider at a power lower than the power for writing data to or erasing data at the magnetic medium.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: April 19, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: James Dillon Kiely
  • Patent number: 9311951
    Abstract: During field operation of a heat-assisted magnetic recording data storage device, a laser adjustment procedure is repeatedly performed. The laser adjustment procedure involves writing, at a designated location on a recording medium at least three tracks at an unsqueezed pitch, a first track being in the middle of the at least three tracks. A first bit error rate of the first track is compared with a reference bit error rate. In response to the comparison satisfying a threshold, the laser current is swept while recording squeezed test tracks at the designated location to determine a new laser current that results in a minimum bit error rate. The new laser current is used for subsequent write operations.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: April 12, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Alfredo Sam Chu, Drew Michael Mader, Wenzhong Zhu, Michael A. Cordle
  • Patent number: 9184562
    Abstract: The present invention provides a light source (2) for light circuits on a silicon platform (3). A vertical laser cavity is formed by a gain region (101) arranged between a top mirror (4) and a bottom grating-mirror (12) in a grating region (11) in a silicon layer (10) on a substrate. A waveguide (18, 19) for receiving light from the grating region (11) is formed within or to be connected to the grating region, and functions as an 5 output coupler for the VCL. Thereby, vertical lasing modes (16) are coupled to lateral in-plane modes (17, 20) of the in-plane waveguide formed in the silicon layer, and light can be provided to e.g. photonic circuits on a SOI or CMOS substrate in the silicon.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: November 10, 2015
    Assignee: DANMARKS TEKNISKE UNIVERSITET
    Inventor: Il-Sug Chung
  • Patent number: 9166162
    Abstract: A resistive memory device includes: a memory cell comprising first and second electrodes and a resistive layer formed therebetween, wherein the resistive layer is formed of a resistance change material; and a strained film formed adjacent to the resistive layer and configured to apply a strain to the resistive layer.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: October 20, 2015
    Assignee: SK Hynix Inc.
    Inventors: Sung-Joon Yoon, Hyung-Dong Lee
  • Patent number: 9099145
    Abstract: A slider and method of making same to reduce contrast interference for visual identification of alignment marks on the slider for heat assisted magnetic recording (HAMR) includes a plurality of alignment marks arranged for alignment of a chip on submount assembly (COSA) with respect to the slider, and at least one shield arranged with the plurality of alignment marks. A hard disk drive includes a plurality of alignment marks arranged for alignment of a chip on submount assembly (COSA) with respect to the slider, and at least one shield arranged with the plurality of alignment marks.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: August 4, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ouyang Bin, Chee Kheng Lim
  • Patent number: 9047880
    Abstract: Systems and methods for providing media having a moment keeper layer for heat assisted magnetic recording (HAMR). One such method for writing information to a magnetic media having a moment keeper layer using heat assisted magnetic recording includes heating a portion of the media to a preselected temperature, where the media includes a magnetic recording layer adjacent to the keeper layer, where a Curie temperature of the keeper layer is greater than a Curie temperature of the recording layer, and where the preselected temperature is about equal to, or greater than, the Curie temperature of the recording layer, allowing the portion of the media to cool, and writing information to the media during the cooling.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: June 2, 2015
    Assignee: WD Media, LLC
    Inventors: Gerardo A. Bertero, David Treves
  • Patent number: 8873903
    Abstract: An apparatus includes a slider structure having a waveguide and a cavity configured to align a laser to the waveguide. The cavity includes a plurality of solder bumps on a bottom of the cavity configured to electrically and thermally couple the laser to the slider. At least one mechanical stopper is disposed in the cavity to facilitate vertical alignment between an output of the laser and an input of the waveguide. At least one solder bump is disposed on the mechanical stopper to facilitate lateral alignment between the output of the laser and the input of the waveguide in response to a reflow of the solder bumps.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: October 28, 2014
    Assignee: Seagate Technology LLC
    Inventor: James Gary Wessel
  • Patent number: 8860216
    Abstract: A method and system for providing a laser diode submount for use in an energy assisted magnetic recording disk drive are described. A portion of a silicon substrate is removed, forming trenches therein. Each trench has sidewalls, surrounds a silicon island corresponding to a laser diode submount, and corresponds to a thickness of the laser diode submount. The silicon island has a top surface and a facets corresponding to the trench sidewalls. Insulator(s) for the top surface and facets of the silicon island are provided. Metallization is provided on the top surface and facets of the silicon island. A first portion of the metallization on the top surface corresponds to under bump metal (UBM) for solder pad(s). A second portion of the metallization corresponds to electrical traces. Solder pad(s) are provided on the UBM. The silicon island is released from the silicon substrate.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: October 14, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Lei Wang, Zongrong Liu, Pezhman Monadgemi
  • Patent number: 8773956
    Abstract: Embodiments of the present invention are directed toward a bi-layer spacer structure and related fabrication processes for improving an interface between a near-field transducer (NFT) and a spacer on an optical waveguide core for an energy assisted magnetic recording (EAMR) system. The embodiments provide a solution for improving the adhesion between the NFT and the spacer.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: July 8, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Zhongyan Wang, Hongxing Yuan, Shawn M. Tanner, Yufeng Hu
  • Patent number: 8724434
    Abstract: A magnetic recording system including follows: a recording head, a recording medium that includes a first recording medium layer, a second recording medium layer, and a substrate. The magnetic recording system includes an electric field applying device applying an electric field and a magnetic field applying device applying a magnetic field to the recording medium, a movement mechanism that moves them to an arbitrary position. The magnetic recording system has a function of controlling an applying direction of at least one of the electric field applying device and the magnetic field applying device, and the recording head is arranged at a position facing the recording medium.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 13, 2014
    Assignee: TDK Corporation
    Inventors: Mikio Matsuzaki, Koichi Shinohara, Tatsuo Shibata, Masashi Sahashi, Tomohiro Nozaki
  • Patent number: 8659291
    Abstract: A polarization microscope optically detects the effect of the magnetic field from a sub-optical resolution magnetic structure on a magneto-optical transducer. The magneto-optical transducer includes a magnetic layer with a magnetization that is changed by the magnetic field produced by the magnetic structure. The saturation field of the magnetic layer is sufficiently lower than the magnetic field produced by the magnetic structure that the area of magnetization change in the magnetic layer is optically resolvable by the polarization microscope. A probe may be used to provide a current to the sample to produce the magnetic field. By analyzing the optically detected magnetization, one or more characteristics of the sample may be determined. A magnetic recording storage layer may be deposited over the magnetic layer, where a magnetic field produced by the sample is written to the magnetic recording storage layer to effect the magnetization of the magnetic layer.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: February 25, 2014
    Assignee: Infinitum Solutions, Inc.
    Inventor: Juergen Heidmann
  • Patent number: 8630152
    Abstract: A device for implementing thermally assisted magnetic recording, using a TE mode laser diode, and method for using it, are described. This device is shaped internally so as to provide three-dimensional self-focusing of plasmon radiation, thereby improving the coupling efficiency between the optical wave-guide and the plasmon generator as a result of ensuring a large overlap between these two modes.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: January 14, 2014
    Assignee: Headway Technologies, Inc.
    Inventors: Xuhui Jin, Joe Smyth, Moris Dovek
  • Patent number: 8576672
    Abstract: A layer configured for use in a magnetic stack has electrical resistivity greater than about 5×10?8 ?m and thermal conductivity greater than about 1 W/mK. In some arrangements, the magnetic stack includes a substrate with the layer disposed over the substrate, a magnetic recording layer disposed over the layer, and a thermal resist layer disposed between the layer and the magnetic recording layer. In some arrangements, the layer is configured to function as a heat sink and a soft under layer. A system that incorporates the layer can include a magnetic write pole, a near field transducer (NFT) positioned proximate the write pole that radiates energy.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: November 5, 2013
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Edward Charles Gage, Ganping Ju, Jan-Ulrich Thiele, Kaizhong Gao
  • Publication number: 20130279309
    Abstract: A magnetic recording system including follows: a recording head, a recording medium that includes a first recording medium layer, a second recording medium layer, and a substrate. The magnetic recording system includes an electric field applying device applying an electric field and a magnetic field applying device applying a magnetic field to the recording medium, a movement mechanism that moves them to an arbitrary position. The magnetic recording system has a function of controlling an applying direction of at least one of the electric field applying device and the magnetic field applying device, and the recording head is arranged at a position facing the recording medium.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 24, 2013
    Inventors: Mikio MATSUZAKI, Koichi Shinohara, Tatsuo Shibata, Masashi Sahashi, Tomohiro Nozaki
  • Patent number: 8553517
    Abstract: A magnetic medium using spin-polarized electrons, and an apparatus and method of recording data on the magnetic medium are provided. The magnetic medium includes a polarization layer and a magnetic recording layer. The polarization layer spin-polarizes electrons. In the magnetic recording layer, the direction of magnetization varies depending on the direction of the spin-polarization of the electrons. The data recording apparatus includes a light source and a probe. The light source radiates circularly polarized light, and the probe injects electrons spin-polarized by the circularly polarized light into a magnetic medium and changes the direction of the magnetization of the magnetic medium to record data on the magnetic medium. Because the direction of magnetization is adjusted using spin-polarized electrons, fast data recording can be achieved.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: October 8, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sung-dong Kim
  • Patent number: 8537652
    Abstract: An optical recording/reproducing apparatus having a label printer for printing labels on an optical disk and a method for printing labels on an optical disk. The optical recording/reproducing apparatus includes an optical disk drive unit recording and reproducing information on a recording surface of an optical disk, a label printer module printing labels on a label surface of the optical disk using thermal transfer, and a controller controlling a label printing operation of the optical disk drive unit and the label printer module, wherein the label printer module includes a ribbon cartridge in which a thermal transfer ribbon to which dyes are attached is wound and which is disposed to face the label surface of the optical disk mounted in the optical disk drive unit, and a thermal printhead transferring the dyes attached to the thermal transfer ribbon onto the label surface of the optical disk using thermal transfer.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: September 17, 2013
    Assignee: Toshiba Samsung Storage Technology Korea Corporation
    Inventors: Won-Ik Cho, Ki-won Yoon, Young-won Lee
  • Patent number: 8520475
    Abstract: A recording/reproducing apparatus includes an optical source and a near-field light generating unit. The near-field light generating unit includes two conductors facing to each other at a predetermined distance and generating near-field light between the two conductors by irradiation of light from the optical source. These two conductors are arranged so that a direction along which the two conductors face to each other is substantially in parallel with the longitudinal direction of a recording mark region. Here, the recording mark region is prepared from a predetermined recording material and having shape anisotropy when information is recorded on a recording medium on which the recording mark is independently formed.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: August 27, 2013
    Assignee: Sony Corporation
    Inventor: Kazuhiro Hongo
  • Patent number: 8520476
    Abstract: A recording/reproducing apparatus includes an optical source and a near-field light generating unit. The near-field light generating unit includes two conductors facing to each other at a predetermined distance and generating near-field light between the two conductors by irradiation of light from the optical source. These two conductors are arranged so that a direction along which the two conductors face to each other is substantially in parallel with the longitudinal direction of a recording mark region. Here, the recording mark region is prepared from a predetermined recording material and having shape anisotropy when information is recorded on a recording medium on which the recording mark is independently formed.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: August 27, 2013
    Assignee: Sony Corporation
    Inventor: Kazuhiro Hongo
  • Patent number: 8477569
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: July 2, 2013
    Assignee: Seagate Technology LLC
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • 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
  • Patent number: 8456962
    Abstract: A magnetic head that writes information to a recording medium includes a magnetic pole layer that generates a writing magnetic field to the recording medium, a microstripline that is disposed in proximity to the magnetic pole layer and to which high frequency current is applied, and a ferromagnetic thin film that is disposed on a portion of the microstripline that faces the recording medium, and that generates a high frequency alternate-current (AC) magnetic field to be applied to the recording medium, using a current magnetic field generated on the microstripline due to the high frequency current.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: June 4, 2013
    Assignee: TDK Corporation
    Inventors: Takekazu Yamane, Yoshikazu Soeno, Akimasa Kaizu, Naomichi Degawa, Hayato Koike
  • Patent number: 8456961
    Abstract: Systems and methods for mounting and aligning a laser in an electrically assisted magnetic recording (EAMR) assembly are described. In one embodiment, the invention relates to a submount assembly for a laser diode of an EAMR head, the submount assembly including a submount including a block shape including a first surface including a plurality of first conductive pads and a second surface including a second conductive pad, a laser including a main emitter and at least one alignment emitter, the laser having a block shape having a first surface including a plurality of first conductive pads attached to the first pads of the submount, and a slider including a top surface having a conductive pad configured to be attached to the second pad of the submount, wherein the at least one alignment emitter is configured to align the laser and the slider for attachment.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: June 4, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Lei Wang, Jih-Chiou Hser
  • Patent number: 8451706
    Abstract: A vertical cavity surface emitting laser includes a semiconductor substrate, a first semiconductor multilayer film reflector of a first conductivity type laminated on the semiconductor substrate, a resonator, and a second semiconductor multilayer film reflector of a second conductivity type laminated on the resonator. In each of the first and second semiconductor multilayer film reflectors, a pair of a high-refractive-index layer and a low-refractive-index layer is stacked. The resonator includes an active layer laminated on the first semiconductor multilayer film reflector. The resonator includes a pair of spacer layers and a resonator extending region. A composition of at least a layer included in the resonator extending region is different from any of compositions of the semiconductor substrate, the first semiconductor multilayer film reflector, and the second semiconductor multilayer film reflector.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: May 28, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Takashi Kondo
  • Patent number: 8451695
    Abstract: An apparatus includes an extended cavity vertical cavity surface emitting laser producing light and having an active region, a first reflector position adjacent to a first side of the active region, an extended cavity positioned adjacent to a second side of the active region, and a second reflector reflecting a first portion of the light into the extended cavity and transmitting a second portion of the light, a planar waveguide positioned adjacent to the extended cavity vertical cavity surface emitting laser, and a horizontal coupler structured to couple the second portion of light from the extended cavity vertical cavity surface emitting laser into the waveguide.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: May 28, 2013
    Assignee: Seagate Technology LLC
    Inventor: Scott Eugene Olson
  • Patent number: 8416647
    Abstract: A near field transducer (NFT) that includes a disk, the disk having a top surface, a side surface, and a center; a peg, the peg positioned adjacent the side surface of the disk; and a heat sink, the heat sink positioned on the top surface of the disk, and the heat sink having an effective center, wherein the NFT has a peg axis, which is defined by the location of the peg adjacent the side surface of the disk, and a non-peg axis, which is perpendicular to the peg axis, and wherein the effective center of the heat sink is positioned at about the center of the disk.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: April 9, 2013
    Assignee: Seagate Technology LLC
    Inventors: Yongjun Zhao, Shuaigang Xiao
  • Patent number: 8416646
    Abstract: A thermally-assisted recording (TAR) disk drive uses “shingled” recording and a rectangular waveguide as a “wide-area” heat source. The waveguide generates a generally elliptically-shaped optical spot that heats an area of the recording layer extending across multiple data tracks. The waveguide core has an aspect ratio (cross-track width to along-the track thickness) that achieves the desired size of the heated area while locating the peak optical intensity close to the trailing edge of the write pole tip where writing occurs. The large cross-track width of the waveguide core increases the volume of recording layer heated by the optical spot, which reduces the rate of cooling. This moves the peak temperature point of the heated area closer to the write pole tip and reduces the temperature drop between the peak temperature and the temperature at the trailing edge of the write pole tip where writing occurs.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: April 9, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Fu-Ying Huang, Jia-Yang Juang, Hal J. Rosen, Barry Cushing Stipe, Timothy Carl Strand, Petrus Antonius VanDerHeijden
  • Patent number: 8385157
    Abstract: A method and system for writing data to a media utilizing an energy assisted magnetic recording (EAMR) head are described. The EAMR head includes at least one laser and at least one EAMR transducer. The laser(s) provide energy. The EAMR transducer(s) are coupled with the laser. The EAMR transducer(s) are configured to direct the energy to spot(s) on the media and to write a plurality of tracks of data in a block. The method and system include writing a track of the plurality of tracks on the media within the spot(s) using the EAMR transducer and stepping a track pitch along a particular radial direction on the media. The method and system also include repeating the writing and stepping steps until the plurality of tracks for the block is written.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: February 26, 2013
    Assignee: Western Digital Technologies, Inc.
    Inventors: Eric J. Champion, Francis H. Liu, Adam F. Torabi
  • Patent number: 8385158
    Abstract: A method and system for fabricating an energy assisted magnetic recording (EAMR) transducer is described. The EAMR transducer has an air-bearing surface (ABS) and a waveguide. The method includes providing a planarized near field transducer (NFT) for the waveguide and forming a sloped surface on the planarized NFT. The sloped surface has a front edge separated from the ABS by a distance. The method and system also include providing a write pole on the sloped surface.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: February 26, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Yufeng Hu, Ut Tran
  • Patent number: 8379494
    Abstract: An apparatus includes a light source for producing a beam of light, a coupler for coupling the light into a slider waveguide, a beam expander for expanding the beam of light from the waveguide to produce an expanded beam, a collimator for collimating the expanded beam, and a focusing device for concentrating the collimated beam to a focal point. A method of delivering light to a focal point is also described.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: February 19, 2013
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Yongjun Zhao
  • Patent number: 8374060
    Abstract: A thermally-assisted magnetic recording method includes first and second steps. The first step applies heat to part of a hard disk medium and forms a moving high-temperature region in a magnetic recording layer of the hard disk medium. The high-temperature region is higher in temperature than a region therearound and has a temperature equal to or higher than the maximum coercivity vanishing temperature of a plurality of magnetic grains contained in the magnetic recording layer. At least one magnetic grain that is adjacent to the rear end of the high-temperature region in the direction of movement of the high-temperature region has a coercivity of a value other than 0. The second step applies a write magnetic field to the hard disk medium such that the write magnetic field applied to the at least one magnetic grain adjacent to the rear end of the high-temperature region is 3 kOe or smaller in magnitude.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: February 12, 2013
    Assignee: TDK Corporation
    Inventors: Koji Shimazawa, Tomohito Mizuno, Hiroshi Kiyono
  • Patent number: 8374059
    Abstract: A heat-assisted magnetic write head includes a magnetic pole having an end surface exposed at an air bearing surface, a waveguide extending toward the air bearing surface to propagate light, a first pair of clads made of a first dielectric material having a refractive index lower than that of the waveguide, and sandwiching the waveguide in a track width direction, and a second pair of clads made of a second dielectric material having a refractive index lower than that of the first dielectric material, and sandwiching the waveguide in a thickness direction orthogonal to the track width direction. Further, the heat-assisted magnetic write head may include, between the magnetic pole and the waveguide, a plasmon generator generating near-field light from the air bearing surface, based on light propagating through the waveguide.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: February 12, 2013
    Assignee: TDK Corporation
    Inventors: Takahiko Izawa, Tsutomu Chuo, Eiji Komura, Kosuke Tanaka
  • Patent number: 8369189
    Abstract: A TAMR (Thermal Assisted Magnetic Recording) writer has a narrow pole tip with a trailing edge magnetic shield. The narrow pole tipped write head uses the energy of laser generated edge plasmons, formed in a plasmon generating layer, to locally heat a PMR magnetic recording medium below its Curie temperature, Tc. When combined with the effects of the narrow tip, this local heating to a temperature below Tc is sufficient to create good transitions and narrow track widths in the magnetic medium. The write head is capable of writing effectively on state-of-the-art PMR recording media having Hk of 20 kOe or more.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: February 5, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Xuhui Jin, Yuchen Zhou, Kenichi Takano, Joe Smyth
  • Patent number: 8289818
    Abstract: A magneto-optical transducer including a magnetic layer on a transparent, non-magnetic substrate is used to characterize the performance of a write head based on optically detected magnetization in the magnetic layer. The write head sample is held in contact with or near the magnetic layer, which is illuminated through the substrate with linearly polarized light. Magnetization in the write head produces a magnetization in the magnetic layer, which alters the polarization state in reflected light. The reflected light is analyzed and the intensity detected using an optical detector, such as one or more photo-detectors or a camera. The performance of the write head can then be characterized using the detected intensity.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: October 16, 2012
    Assignee: Infinitum Solutions, Inc.
    Inventors: Alexander M. Taratorin, Juergen Heidmann
  • Publication number: 20120250472
    Abstract: A magnetic head that writes information to a recording medium includes a magnetic pole layer that generates a writing magnetic field to the recording medium, a microstripline that is disposed in proximity to the magnetic pole layer and to which high frequency current is applied, and a ferromagnetic thin film that is disposed on a portion of the microstripline that faces the recording medium, and that generates a high frequency alternate-current (AC) magnetic field to be applied to the recording medium, using a current magnetic field generated on the microstripline due to the high frequency current.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 4, 2012
    Applicant: TDK Corporation
    Inventors: Takekazu YAMANE, Yoshikazu Soeno, Akimasa Kaizu, Naomichi Degawa, Hayato Koike
  • Patent number: 8279719
    Abstract: A method and system for providing an energy assisted magnetic recording (EAMR) transducer coupled with a laser are described. The EAMR transducer has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The method and system include providing at least one waveguide, at least one write pole, and at least one coil. The waveguide(s) are for directing the energy from the laser toward the ABS. The write pole(s) each include a write pole tip, a yoke, a back pedestal and a return pole. The write pole tip is coupled to the back pedestal through the yoke. The back pedestal has at least one aperture therein. The aperture(s) are configured to allow the energy from the laser to pass therethrough. The coil(s) are for energizing the at least one write pole.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: October 2, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Yufeng Hu, Yugang Wang
  • Patent number: 8270256
    Abstract: A thermally-assisted recording (TAR) disk drive uses a “wide-area” heater with “shingled” recording. In shingled recording, the write head pole tip is wider than the read head in the cross-track direction and writes magnetic transitions by making a plurality of consecutive circular paths that partially overlap. The non-overlapped portions of adjacent paths form the data tracks, which are thus narrower than the width of the write pole tip. The data tracks are grouped into annular bands and when data is to be rewritten, all of the data tracks in an annular band are also rewritten. The wide-area heater may be a waveguide with an output end that generates a heated area on the disk recording layer which is wider than the cross-track width of the write pole tip. It has been determined that the use of a wide-area heater with shingled recording does not result in any significant adjacent track erasure (ATE).
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: September 18, 2012
    Assignee: Hitachi Global Storage Technologies Netherland B.V.
    Inventors: Jia-Yang Juang, Hal J. Rosen, Barry Cushing Stipe, Timothy Carl Strand, Petrus Antonius VanDerHeijden
  • Publication number: 20120230167
    Abstract: A microwave assisted magnetic head of the present invention includes: at least two or more auxiliary coils that are arranged in a periphery of a writing main pole; and microwave current supply means that applies microwave currents to the at least two or more auxiliary coils. The at least two or more auxiliary coils respectively include linear body parts linearly arranged on an ABS side, two of the linear body parts of the at least two or more auxiliary coils are arranged in a substantially orthogonal positional relationship, and the microwave current supply means is configured such that the microwave current supply means changes phase differences of the microwave currents applied respectively to the at least two or more auxiliary coils. Therefore, the microwave current can be easily controlled, and thus, a circularly polarized magnetic field with high magnetization inversion efficiency can be generated as an assistance magnetic field.
    Type: Application
    Filed: March 11, 2011
    Publication date: September 13, 2012
    Applicant: TDK CORPORATION
    Inventors: Tsutomu AOYAMA, Tetsuya Roppongi, Yoshikazu Soeno, Kiyoshi Noguchi, Isamu Sato
  • Patent number: 8228764
    Abstract: A recording/reproducing apparatus includes an optical source and a near-field light generating unit. The near-field light generating unit includes two conductors facing to each other at a predetermined distance and generating near-field light between the two conductors by irradiation of light from the optical source. These two conductors are arranged so that a direction along which the two conductors face to each other is substantially in parallel with the longitudinal direction of a recording mark region. Here, the recording mark region is prepared from a predetermined recording material and having shape anisotropy when information is recorded on a recording medium on which the recording mark is independently formed.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: July 24, 2012
    Assignee: Sony Corporation
    Inventor: Kazuhiro Hongo
  • Patent number: 8203913
    Abstract: A recording/reproduction apparatus includes: a light source; and a near-field light production section that includes two conductor sections disposed opposite each other with a predetermined gap therebetween and that produces near-field light between the two conductor sections upon light irradiation from the light source, the two conductor sections being disposed such that when information is recorded on a recording medium using the near-field light, a direction from one of the two conductor sections to the other of the two conductor sections is generally perpendicular to a line direction of the recording medium.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: June 19, 2012
    Assignee: Sony Corporation
    Inventors: Kazuhiro Hongo, Tetsu Watanabe
  • Patent number: 8194508
    Abstract: The presently disclosed technology teaches a transducer head with a read sensor, a write pole, and one or more waveform sensors attached to the transducer head. Further, a waveform propagates in the direction of a BPM and the waveform sensor is configured to detect the waveform after it is reflected from the BPM. Additionally, a spin-polarized current is influenced by the BPM and a spin angular momentum sensor detects changes in spin angular momentum of the current. Further, a processor relates at least one property of the reflected waveform and/or current with positions of patterned bits on the BPM. The processor may then modify a timing signal and/or transducer head position to ensure that data bits are accurately written to the BPM. The end result is the ability to more quickly and accurately detect the patterned bits and synchronize a position of the transducer head with the patterned bits.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: June 5, 2012
    Assignee: Seagate Technology LLC
    Inventors: Alan Biggar Johnston, Dieter Klaus Weller, Mark Anthony Gubbins
  • Patent number: 8164610
    Abstract: A surface-condition-information obtaining unit obtains information on a surface condition of a rewritable display medium on which information is reversely displayed visually. A write-laser output unit outputs a write laser to irradiate the rewritable display medium with the write laser, to perform a drawing on the rewritable display medium. A control unit performs a write process for displaying an image on the rewritable display medium by adjusting a laser output condition based on the information obtained by the surface-condition-information obtaining unit and controlling the write-laser output unit based on an adjustment of the laser output condition.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: April 24, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiko Nakata, Tsutomu Nakajima, Noriyuki Ochiai, Yukiko Sahashi, Yoshihiko Hotta, Shinya Kawahara, Hiroshi Uenishi, Tomomi Ishimi
  • Patent number: 8164986
    Abstract: A magnetic recording head capable of a satisfying thermally-assisted magnetic recording without depending on the use of a near-field light generator is provided. The head comprises a waveguide and a main magnetic pole having a main pole tip. Further, at least a portion of the main pole tip is embedded in a groove provided in the upper surface of the waveguide. Further, a second clad layer is provided on the first clad layer and on a rear side from the main pole tip. This configuration of the first and second clad layers suppresses the absorption of the light propagating through the waveguide by the main magnetic pole. Further, the configuration in which at least a portion of the main pole tip is embedded in the groove can cause the distance between the light spot center of the waveguide and the main magnetic pole to be sufficiently small.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: April 24, 2012
    Assignee: TDK Corporation
    Inventors: Susumu Aoki, Daisuke Miyauchi, Seiichi Takayama, Koji Shimazawa, Tetsuya Roppongi
  • Patent number: 8159769
    Abstract: Devices and methods are provided for heat-assisted magnetic recording (HAMR). In an illustrative example, a device includes a magnetic write pole having a convex pole tip; a magnetic opposing pole longitudinally displaced from the magnetic write pole; and a thermal-source component disposed proximate to the magnetic write pole and comprising a laterally elongated thermal-source peg disposed proximate to the convex pole tip.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: April 17, 2012
    Assignee: Seagate Technology LLC
    Inventors: Sharat Batra, Amit Vasant Itagi, Ganping Ju, Xuhui Jin