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1.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.
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Patent Agency Ranking
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.
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公开(公告)号：US20230005503A1
公开(公告)日：2023-01-05
申请号：US17365863
申请日：2021-07-01
Applicant: Western Digital Technologies, Inc.
Inventor： Takashi Iwanami , Kouji Matsuda , Junguo Xu , Kenji Tasaka , Hoan Cong Ho , Tomoko Seki , Paul Christopher Dorsey , Masayoshi Shimokoshi
Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a magnesium (Mg) trapping layer that is configured to mitigate Mg migration in the HAMR medium so as to prevent near field transducer (NFT) damage caused by dissociated Mg reacting with a compound used in the NFT. In one example, the HAMR medium can include a substrate, a seed layer on the substrate and including MgO, a magnetic recording layer on the seed layer, and a Mg trapping layer on the substrate and configured to mitigate Mg migration from the seed layer to a surface of the HAMR medium above the magnetic recording layer.
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4.发明公开公开(公告)号：US20240071416A1
公开(公告)日：2024-02-29
申请号：US17895566
申请日：2022-08-25
Applicant: Western Digital Technologies, Inc.
Inventor： Hoan Cong Ho , Tomoko Seki , Paul Christopher Dorsey
CPC classification number: G11B5/66 , G11B5/7369 , G11B5/851 , G11B2005/0021
Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium. The HAMR medium includes a substrate, a heat sink layer on the substrate, and a plurality of magnetic recording layers on the heat sink layer. The plurality of magnetic recording layers includes a first magnetic layer and a second magnetic layer disposed on the first magnetic layer. The second magnetic layer includes FePt—Ag—Cu—X, wherein X is a segregant comprising BN. The HAMR medium can use BN-based segregants to improve a thermal gradient of the HAMR medium for better areal density capability (ADC) and enable the use of a MgO underlayer with reduced thickness.
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5.发明公开公开(公告)号：US20240055019A1
公开(公告)日：2024-02-15
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
IPC: G11B5/73
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.
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6.发明申请公开(公告)号：US20220139422A1
公开(公告)日：2022-05-05
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.
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