-
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.
-
公开(公告)号：US11735217B2
公开(公告)日：2023-08-22
申请号：US17361272
申请日：2021-06-28
Applicant: Western Digital Technologies, Inc.
Inventor： Hua Yuan , Paul Christopher Dorsey
CPC classification number: G11B5/73917 , G11B5/4826 , H01F1/047 , C22C5/04 , C22C2202/02 , G11B2005/0021
Abstract: Aspects of the present disclosure provide a heat assisted magnetic recording HAMR media structure and methods for reducing the Curie temperature distribution to improve the signal-to-noise characteristics of HAMR media. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and a magnetic recording layer on the heat sink layer. The magnetic recording layer includes a plurality of magnetic recording grains configured for recording and comprising a first magnetic alloy. The magnetic recording layer further includes a plurality of segregants disposed to isolate the plurality of magnetic recording grains and comprising a second magnetic alloy. A Curie temperature of the second magnetic alloy is higher than a Curie temperature of the first magnetic alloy.
-
3.发明授权公开(公告)号：US11521648B2
公开(公告)日：2022-12-06
申请号：US17171852
申请日：2021-02-09
Applicant: Western Digital Technologies, Inc.
Inventor： Hoan Cong Ho , Paul Christopher Dorsey , Tomoko Seki
Abstract: A heat-assisted magnetic recording (HAMR) medium has a multilayered underlayer between the heat-sink layer and the recording layer. One embodiment of the underlayer is a multilayer of a thermal barrier layer consisting essentially of MgO and TiO, and a seed layer containing MgO and nitrogen (N) directly on the thermal barrier layer, with the recording layer on and in contact with the seed layer. The interface between the thermal barrier layer and the seed layer contains Ti and N, some of which may be present as TiN to act as a diffusion barrier to prevent diffusion of the Ti into the recording layer. The Ti-containing thermal barrier layer has a higher thermal resistivity than the conventional MgO thermal barrier/seed layer and thus allows for reduced laser power to the recording layer while still achieving a high thermal gradient at the recording layer.
-
4.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.
-
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.
-
Patent Agency Ranking
6.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.
-
公开(公告)号：US20210407543A1
公开(公告)日：2021-12-30
申请号：US17361272
申请日：2021-06-28
Applicant: Western Digital Technologies, Inc.
Inventor： Hua Yuan , Paul Christopher Dorsey
Abstract: Aspects of the present disclosure provide a heat assisted magnetic recording HAMR media structure and methods for reducing the Curie temperature distribution to improve the signal-to-noise characteristics of HAMR media. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and a magnetic recording layer on the heat sink layer. The magnetic recording layer includes a plurality of magnetic recording grains configured for recording and comprising a first magnetic alloy. The magnetic recording layer further includes a plurality of segregants disposed to isolate the plurality of magnetic recording grains and comprising a second magnetic alloy. A Curie temperature of the second magnetic alloy is higher than a Curie temperature of the first magnetic alloy.
-
公开(公告)号：US10650854B1
公开(公告)日：2020-05-12
申请号：US15489167
申请日：2017-04-17
Applicant: Western Digital Technologies, Inc.
Inventor： Hua Yuan , Paul Christopher Dorsey , Fenghua Zong , Shahid Ali Pirzada , Allen Joseph Bourez , Zhaoqiang Bai
Abstract: A heat-assisted magnetic recording (HAMR) medium has a heat-sink layer, a chemically-ordered FePt (or CoPt) alloy magnetic layer and a MgNiO intermediate layer between the heat-sink layer and the magnetic layer. The intermediate layer is a solid substitution crystalline alloy of the form (Mg(100-y)Niy)O, where y is less than 10 and greater than or equal to 0.5. The magnetic layer may be formed directly on the MgNiO intermediate layer, in which case the MgNiO intermediate layer functions as both a seed layer and a thermal barrier layer. The HAMR medium may also include an optional layer of crystalline “pure” MgO directly below or directly above the MgNiO intermediate layer. If the MgO layer is located directly above the MgNiO intermediate layer then the MgNiO intermediate layer functions primarily as a thermal barrier layer. The HAMR medium with the MgNiO intermediate layer provides a substantial improvement in corrosion resistance.
-
9.发明公开公开(公告)号：US20240096368A1
公开(公告)日：2024-03-21
申请号：US17945747
申请日：2022-09-15
Applicant: Western Digital Technologies, Inc.
Inventor： Hua Yuan , Hoan Cong Ho , Paul Christopher Dorsey
CPC classification number: G11B13/08 , G11B5/73917 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and an underlayer on the heat sink layer. The underlayer includes an amount of an electrically conductive material between about 20 mole percent (mol %) and about 100 mol %. The magnetic recording medium further includes the plurality of magnetic recording layers on the underlayer. The plurality of magnetic recording layers includes a first magnetic recording layer that comprises FePt—Ag—X, wherein X is an oxide.
-
公开(公告)号：US11900978B1
公开(公告)日：2024-02-13
申请号：US17886244
申请日：2022-08-11
Applicant: Western Digital Technologies, Inc.
Inventor： Hoan Cong Ho , Hua Yuan , Tomoko Seki , Paul Christopher Dorsey
CPC classification number: G11B5/73917 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a magnetic recording layer on a magnesium oxide-titanium oxide (MTO) underlayer, where the MTO underlayer includes an additive material that chemically bonds with titanium. In some examples, the additive material includes iron-oxide, iron, carbon, or various aluminum oxides. By providing the additive material to the MTO that chemically bonds with the titanium of the MTO, diffusion of titanium from the MTO underlayer into the magnetic recording layer is mitigated to provide an improved recording layer that achieves improved areal densities. In some embodiments, an additional magnesium oxide-nitrogen underlayer is also provided, which may include more of the additive material.
-
-
-
-
-
-
-
-
-
Search Results
19
records
(took 0.04 seconds)
