-
公开(公告)号：US12087341B2
公开(公告)日：2024-09-10
申请号：US16862809
申请日：2020-04-30
申请人： SHOWA DENKO K.K.
发明人： Chen Xu , Lei Zhang , Takayuki Fukushima , Hisato Shibata , Takehiro Yamaguchi , Kazuya Niwa , Tomoo Shige , Hiroaki Nemoto , Yuji Umemoto , Hiroshi Koyanagi
CPC分类号： G11B5/73919 , G11B5/657 , G11B5/658
摘要： A magnetic recording medium includes a substrate, an underlayer formed on the substrate, and a magnetic layer formed on the underlayer. The magnetic layer includes an alloy having a L10 structure. The underlayer includes a first underlayer and a second underlayer. The first underlayer includes Mo and Ru, the content of Ru in the first underlayer is in a range of 5 atom % to 30 atom %, and the second underlayer includes a material having a body-centered cubic (BCC) structure. The second underlayer is formed between the first underlayer and the substrate.
-
公开(公告)号：US11862214B2
公开(公告)日：2024-01-02
申请号：US17953149
申请日：2022-09-26
申请人： FUJIFILM Corporation
发明人： Yujin Shibata , Norihito Kasada , Takuto Kurokawa , So Matsuyama
CPC分类号： G11B5/653 , G11B5/00813 , G11B5/584 , G11B5/733 , G11B5/78 , G11B23/107
摘要： The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.
-
公开(公告)号：US11763845B2
公开(公告)日：2023-09-19
申请号：US17554341
申请日：2021-12-17
CPC分类号： G11B5/716 , G11B5/657 , G11B5/7369 , G11B5/7379
摘要： A magnetic stack includes a substrate and a soft magnetic underlayer deposited on a top surface of the substrate. A heat sink layer is disposed on top of the soft magnetic underlayer, and an interlayer is deposited on top of the heat sink layer. A non-magnetic seed layer is deposited on top of the interlayer. A magnetic recording structure which includes more than one magnetic recording layer is deposited on the top surface of the non-magnetic seed layer.
-
公开(公告)号：US11688425B2
公开(公告)日：2023-06-27
申请号：US17046375
申请日：2020-06-17
发明人： Minoru Yamaga , Tooru Sato , Kanako Hashimoto
摘要： It is an object to provide a magnetic recording medium that enables good reproduction even after long-term preservation and that has a small overall thickness.
The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, a ground layer, a base layer, and a back layer, in which an average thickness tT of the magnetic recording medium is equal to or less than 5.3 μm, and, when the magnetic recording medium is subjected to dynamic viscoelasticity measurement at a frequency of 10 Hz and a temperature rise rate of 2° C./min, a difference between a maximum and a minimum of a viscosity term E″ in a temperature range of 0° C. to 80° C. is equal to or less than 0.18 GPa. In addition, the present technology also provides a tape cartridge including the tape-shaped magnetic recording medium.-
公开(公告)号：US11621020B2
公开(公告)日：2023-04-04
申请号：US16490279
申请日：2018-04-06
申请人： SONY CORPORATION
发明人： Junichi Tachibana , Takashi Aizawa , Teruo Sai , Noboru Sekiguchi , Tetsuo Endo , Tomoe Ozaki , Ryoichi Hiratsuka
摘要： A magnetic recording medium includes a flexible and elongated substrate, a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less, and a recording layer. The soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.
-
公开(公告)号：US11618944B2
公开(公告)日：2023-04-04
申请号：US17266896
申请日：2019-05-23
IPC分类号： H01J37/34 , C23C14/34 , C22C19/07 , G11B5/706 , H01F1/10 , H01F41/18 , G11B5/65 , C04B35/01 , C23C14/08 , C23C14/14 , C22C32/00 , C22C1/04
摘要： Provided is a sputtering target, the sputtering target containing 0.05 at % or more of Bi and having a total content of metal oxides of from 10 vol % to 60 vol %, the balance containing at least Co and Pt.
-
公开(公告)号：US11615812B2
公开(公告)日：2023-03-28
申请号：US16649482
申请日：2019-10-03
申请人： Sony Corporation
发明人： Minoru Yamaga , Takanobu Iwama , Jun Takahashi
IPC分类号： G11B5/71 , G11B5/706 , G11B5/735 , G11B5/73 , G11B5/65 , G11B5/66 , C10M129/40 , C10M129/70 , G11B5/714 , G11B5/78
摘要： 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：US20230078748A1
公开(公告)日：2023-03-16
申请号：US17472415
申请日：2021-09-10
发明人： Yoshihiro Ikeda
摘要： 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.
-
公开(公告)号：US20230005503A1
公开(公告)日：2023-01-05
申请号：US17365863
申请日：2021-07-01
发明人： Takashi Iwanami , Kouji Matsuda , Junguo Xu , Kenji Tasaka , Hoan Cong Ho , Tomoko Seki , Paul Christopher Dorsey , Masayoshi Shimokoshi
摘要： 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.
-
10.发明授权公开(公告)号：US11495256B2
公开(公告)日：2022-11-08
申请号：US17185106
申请日：2021-02-25
申请人： FUJIFILM Corporation
发明人： Yoshihiro Sawayashiki , Gen Omura
摘要： The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. The ferromagnetic powder is a ferromagnetic powder selected from the group consisting of a hexagonal strontium ferrite powder and an ε-iron oxide powder. The standard deviation of a height of the magnetic projection portion on a surface of the magnetic layer is in a range of 0.5 to 2.5 nm.
-
-
-
-
-
-
-
-
-
搜索结果
1004 条记录 (耗时 0.019 秒)
