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1.发明公开公开(公告)号：US20240135969A1
公开(公告)日：2024-04-25
申请号：US18226026
申请日：2023-07-24
Applicant: Western Digital Technologies, Inc.
Inventor： Asif Bashir , Pierre-Olivier Jubert , Antony Ajan , Paul Christopher Dorsey
IPC: G11B5/73
CPC classification number: G11B5/7375 , G11B5/7369 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.
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公开(公告)号：US10109309B1
公开(公告)日：2018-10-23
申请号：US15694276
申请日：2017-09-01
Applicant: Western Digital Technologies, Inc.
Inventor： Pierre-Olivier Jubert , Kumar Srinivasan
IPC: G11B5/73 , G11B5/708 , G11B5/706 , G11B13/08 , G11B5/49 , G11B5/738 , H01F10/10 , H01F10/12 , G11B5/00
Abstract: A heat-assisted magnetic recording (HAMR) medium includes a perpendicular magnetic recording layer (typically a chemically-ordered FePt alloy), a seed/thermal barrier layer (typically MgO) below the recording layer, and a heat-sink layer with anisotropic thermal conductivity below the seed/thermal barrier layer. The in-plane thermal conductivity of the heat-sink layer is greater than its out-of-plane thermal conductivity. The heat-sink layer may be selected from hexagonal boron nitride (h-BN), hexagonal graphite, and the 6H polytype of hexagonal silicon carbide (6H-SiC). If the heat-sink layer is h-BN, the h-BN layer is formed on a seed layer and has its c-axis oriented out-of-plane (substantially orthogonal to the surface of the medium substrate).
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3.发明授权公开(公告)号：US11257525B1
公开(公告)日：2022-02-22
申请号：US17176282
申请日：2021-02-16
Applicant: Western Digital Technologies, Inc.
Inventor： Sukumar Rajauria , Pierre-Olivier Jubert , Richard M. Brockie
Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a laser and a near field transducer (NFT). A thermal gradient produced in the magnetic media by the NFT is periodically measured, and a failure of the NFT is predicted based on a slope of the thermal gradient measurements.
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4.发明授权公开(公告)号：US10276202B1
公开(公告)日：2019-04-30
申请号：US15959358
申请日：2018-04-23
Applicant: Western Digital Technologies, Inc.
Inventor： Pierre-Olivier Jubert , Hua Yuan , Paul Christopher Dorsey
Abstract: A heat-assisted magnetic recording (HAMR) medium has a rhodium (Rh) or Rh-based alloy heat-sink layer. The Rh or Rh-based alloy does not roughen when annealed and thus does not require an intermediate layer between it and the MgO seed layer for the recording layer, so the MgO seed layer can be formed directly on and in contact with the Rh or Rh-based alloy heat-sink layer. The Rh or Rh-based alloy heat-sink layer is formed on a seed layer or multilayer that allows the Rh or Rh-based alloy to grow with the desired face-centered-cubic (fcc) crystalline structure.
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公开(公告)号：US12087339B2
公开(公告)日：2024-09-10
申请号：US18226026
申请日：2023-07-25
Applicant: Western Digital Technologies, Inc.
Inventor： Asif Bashir , Pierre-Olivier Jubert , Antony Ajan , Paul Christopher Dorsey
CPC classification number: G11B5/7375 , G11B5/7369 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.
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Patent Agency Ranking
公开(公告)号：US11423939B1
公开(公告)日：2022-08-23
申请号：US17176302
申请日：2021-02-16
Applicant: Western Digital Technologies, Inc.
Inventor： Pierre-Olivier Jubert , Sukumar Rajauria
Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil and a write pole. A test pattern is written to the magnetic media by applying a first current to the write coil. A second current is applied to the write coil while the head passes over the test pattern, wherein the second current has a polarity opposite the first current. After applying the second current to the write coil while the head passes over the test pattern, the test pattern is read from the magnetic media using the head to generate a first read signal, and a first noise power of the first read signal is measured. A degradation of the write pole is detected based on the first noise power measurement.
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公开(公告)号：US11276432B1
公开(公告)日：2022-03-15
申请号：US17176354
申请日：2021-02-16
Applicant: Western Digital Technologies, Inc.
Inventor： Pierre-Olivier Jubert , Andreas Moser , Daniel S. Wolf , Toan Tang , Thien Nguyen , Harold H. Gee
Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write coil, a laser configured to heat the magnetic media during a write operation, and a read element. A test pattern is written to the magnetic media by applying a current to the write coil and a first bias to the laser. A second bias is applied to the laser while the head passes over the test pattern, and then the test pattern is read from the magnetic media using the head to generate a first read signal. A first noise power of the first read signal is measured, and at least one parameter of a noise power function is generated based on the first noise power measurement, wherein the noise power function is a function of at least the bias applied to the laser.
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8.发明公开公开(公告)号：US20240233763A9
公开(公告)日：2024-07-11
申请号：US18226026
申请日：2023-07-25
Applicant: Western Digital Technologies, Inc.
Inventor： Asif Bashir , Pierre-Olivier Jubert , Antony Ajan , Paul Christopher Dorsey
IPC: G11B5/73
CPC classification number: G11B5/7375 , G11B5/7369 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.
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公开(公告)号：US11869556B2
公开(公告)日：2024-01-09
申请号：US17897374
申请日：2022-08-29
Applicant: Western Digital Technologies, Inc.
Inventor： Pierre-Olivier Jubert , Paul Christopher Dorsey , Hoan Cong Ho
CPC classification number: G11B5/70621 , G11B5/1278 , G11B5/653 , G11B5/672 , G11B5/7369 , G11B5/7375 , G11B5/82 , G11B7/1387 , G11B2005/0021
Abstract: A heat-assisted magnetic recording (HAMR) disk has a magnetic recording layer (typically a FePt chemically-ordered alloy), a seed-thermal barrier layer (typically MgO) below the recording layer, a heat-sink layer, and an optical-coupling multilayer of alternating plasmonic and non-plasmonic materials between the heat-sink layer and the seed-thermal barrier layer. Unlike a heat sink layer, the multilayer has very low in-plane and out-of-plane thermal conductivity and thus does not function as a heat sink layer. The multilayer's low thermal conductivity allows the multilayer to also function as a thermal barrier. Due to the plasmonic materials in the multilayer it provides excellent optical coupling with the near-field transducer (NFT) of the HAMR disk drive.
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公开(公告)号：US12159653B1
公开(公告)日：2024-12-03
申请号：US18232458
申请日：2023-08-10
Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
Inventor： Sukumar Rajauria , Pierre-Olivier Jubert , Phillip S. Haralson , Jimmy Zhang , Farzad Novin
IPC: G11B11/105 , G11B5/03 , G11B5/54 , G11B5/00
Abstract: Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position a selected head among one or more heads proximate to a corresponding disk surface among the one or more disks, wherein the selected head comprises a magnetic write element and a laser generating component; and one or more processing devices. The one or more processing devices are configured to measure a magnetic saturation responsiveness of the corresponding disk surface to heat-assisted write operations using a range of values of write laser current applied to the laser generating component. The one or more processing devices are further configured to calibrate a nominal write laser current of the selected head for the corresponding disk surface based on the measured magnetic saturation responsiveness of the corresponding disk surface.
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