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公开(公告)号：US12236987B2
公开(公告)日：2025-02-25
申请号：US17472415
申请日：2021-09-10
Applicant: Western Digital Technologies, Inc.
Inventor： Yoshihiro Ikeda
Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a magnetic recording medium that capping layer doped with an effective amount of metal to control grain-to-grain exchange coupling in a capping layer. A magnetic recording medium includes a substrate, a magnetic recording layer (MRL) on the substrate, and a capping layer on the MRL. The capping layer include Co and is doped with a metal (e.g., Ru or Ta) in a range from 1 atomic percent to 5 atomic percent, inclusive.
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公开(公告)号：US20250037739A1
公开(公告)日：2025-01-30
申请号：US18782557
申请日：2024-07-24
Applicant: Resonac Corporation
Inventor： Takayuki FUKUSHIMA , Takehiro YAMAGUCHI , Yuki SATO
Abstract: A magnetic recording medium includes a substrate, an underlayer, a first magnetic layer, and a second magnetic layer in this order. The first magnetic layer includes magnetic grains having a L10 structure, and the second magnetic layer has a granular structure including magnetic grains having a L10 structure, and a grain boundary portion including hexagonal boron nitride. A (111) plane of the magnetic grains included in the first magnetic layer is covered with boron nitride at an interface with the second magnetic layer. The magnetic grains included in the second magnetic layer are epitaxially grown from a (001) plane of the magnetic grains included in the first magnetic layer. The magnetic grains included in the first magnetic layer and the magnetic grains included in the second magnetic layer are columnar crystals penetrating the first magnetic layer and the second magnetic layer, respectively.
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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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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.
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5.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：US20220165302A1
公开(公告)日：2022-05-26
申请号：US16649482
申请日：2019-10-03
Applicant: Sony Corporation
Inventor： Minoru YAMAGA , Takanobu IWAMA , Jun TAKAHASHI
IPC: G11B5/71 , G11B5/66 , G11B5/714 , G11B5/78 , G11B5/735 , G11B5/73 , G11B5/706 , C10M129/70 , C10M129/40 , G11B5/65
Abstract: An object is to provide a magnetic recording medium having excellent traveling stability and a thin total thickness.
The present technology provides a tape-shaped magnetic recording medium including: a magnetic layer; an underlayer; a base layer; and a back layer, in which a surface on a side of the magnetic layer has a kurtosis of 3.0 or more, a surface on a side of the back layer has a kurtosis of 2.0 or more, the surface on the magnetic layer side has arithmetic average roughness Ra of 2.5 nm or less, the base layer includes a polyester as a main component, the magnetic recording medium has an average thickness tT of 5.6 μm or less, the magnetic recording medium includes a lubricant, the lubricant includes a fatty acid and a fatty acid ester, and a mass ratio between the fatty acid and the fatty acid ester extracted with hexane satisfies fatty acid/fatty acid ester ≤0.6, and the magnetic recording medium has pores, and the pores have an average diameter of 6 nm or more and 11 nm or less when the diameters of the pores are measured in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.-
公开(公告)号：US11315596B2
公开(公告)日：2022-04-26
申请号：US16573912
申请日：2019-09-17
Applicant: International Business Machines Corporation
Inventor： Richard Bradshaw
Abstract: A method for making a magnetic recording tape, in accordance with one approach, includes coupling an underlayer to a substrate, the substrate comprising a poly ether ether ketone (PEEK). A method for making a magnetic recording tape in accordance with another approach includes coupling an underlayer to a substrate via radiation-induced grafting, the substrate comprising a poly ether ether ketone (PEEK). A recording layer is coupled to the underlayer.
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8.发明授权公开(公告)号：US11276428B2
公开(公告)日：2022-03-15
申请号：US16904400
申请日：2020-06-17
Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
Inventor： Yoshihiro Ikeda
Abstract: A magnetic recording medium is provided that includes a recording layer structure including a first magnetic recording layer, a second magnetic recording layer, a third magnetic recording layer, a fourth magnetic recording layer, and a plurality of nonmagnetic exchange coupling layers. The first magnetic recording layer is closest to a substrate and the fourth magnetic recording layer is farthest from the substrate. An amount of Co in the first magnetic recording layer is greater than or equal to the amount of Co in the second magnetic recording layer, the third magnetic recording layer, and the fourth magnetic recording layer.
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公开(公告)号：US10984829B2
公开(公告)日：2021-04-20
申请号：US16279143
申请日：2019-02-19
Applicant: SHOWA DENKO K.K.
Inventor： Kota Hasegawa , Katsuaki To
Abstract: A magnetic recording medium includes a nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protection layer that are arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer that are arranged in this order on the orientation control layer. The first magnetic layer has a granular structure including an oxide at grain boundary parts of magnetic grains, and the second magnetic layer is closest to the protection layer among layers within the perpendicular magnetic layer, and includes magnetic grains made of a CoCrPt alloy, and a nitride of carbon or a hydride of carbon.
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公开(公告)号：US20210082462A1
公开(公告)日：2021-03-18
申请号：US16573902
申请日：2019-09-17
Applicant: International Business Machines Corporation
Inventor： Richard Bradshaw
Abstract: A magnetic recording tape, in accordance with one approach, includes a substrate comprising a poly ether ether ketone (PEEK). An underlayer is positioned above the substrate. A recording layer is positioned above the underlayer.
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