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公开(公告)号：US11468910B2
公开(公告)日：2022-10-11
申请号：US17275578
申请日：2019-08-29
申请人： Sony Corporation
发明人： Hiroto Atagi , Noboru Sekiguchi , Takashi Aizawa , Tomoe Ozaki , Koji Suzuki , Yoichi Kanemaki , Teruo Sai , Ryoichi Hiratsuka , Kazuya Hashimoto
摘要： A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 μm or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 μm or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.
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公开(公告)号：US11574651B2
公开(公告)日：2023-02-07
申请号：US16477687
申请日：2017-12-28
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
摘要： A magnetic recording medium, which is used in a recording and playback device in which the shortest recording wavelength is 75 nm or less, in which the magnetic recording medium has a recording layer including powder of ε-iron oxide-containing particles, the average particle size of the particles is 22 nm or less, the coercive force He is 220 kA/m or more and 320 kA/m or less, and the non linear transition shift is 20% or less.
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公开(公告)号：US11217277B2
公开(公告)日：2022-01-04
申请号：US16609993
申请日：2018-04-13
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
摘要： Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ε iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.
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公开(公告)号：US11798588B2
公开(公告)日：2023-10-24
申请号：US16609135
申请日：2018-04-24
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
CPC分类号： G11B5/667 , G11B5/653 , G11B5/70642 , G11B5/712 , G11B5/73919 , H01F1/147
摘要： Provided is a magnetic recording medium having a recording track width of 2 μm or less, including: a recording layer containing a powder of particles containing ε iron oxide, in which a squareness ratio measured in a transport direction is 30% or less, a squareness ratio S1 measured in the transport direction and a squareness ratio S2 measured in a width direction satisfy a relationship S1≥S2, a coercive force is 220 kA/m or greater and 310 kA/m or less, an activation volume is 8000 nm3 or less, and in a switching field distribution (SFD) curve, a peak ratio X/Y of a main peak height X and a height Y of a sub-peak near zero magnetic field is 3.0 or greater.
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公开(公告)号：US11355145B2
公开(公告)日：2022-06-07
申请号：US16070140
申请日：2016-12-14
申请人： Sony Corporation
发明人： Eiji Nakashio , Masaru Terakawa , Yoichi Kanemaki , Tomoe Sato , Katsunori Maeshima , Nobuyuki Sasaki
摘要： The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more.
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公开(公告)号：US10803897B2
公开(公告)日：2020-10-13
申请号：US15928684
申请日：2018-03-22
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
摘要： A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ε:Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
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公开(公告)号：US20150111066A1
公开(公告)日：2015-04-23
申请号：US14514518
申请日：2014-10-15
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
IPC分类号： G11B5/706
CPC分类号： G11B5/70642 , G11B5/70
摘要： A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ε-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
摘要翻译： 磁记录介质包括非磁性支撑体和含有磁性粉末的磁性层，其中磁性粉末含有Fe-Fe 2 O 3晶体（包括用金属元素M代替Fe部位的情况），产物为 剩余磁化强度和磁性层的厚度为0.5mA〜6.0mA，在磁性层的长度方向上测定的矩形比为0.3以下。
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公开(公告)号：US11430477B2
公开(公告)日：2022-08-30
申请号：US16945582
申请日：2020-07-31
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
摘要： A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ε-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
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公开(公告)号：US11031034B2
公开(公告)日：2021-06-08
申请号：US16321291
申请日：2017-11-17
申请人： Sony Corporation
发明人： Masaru Terakawa , Yoichi Kanemaki , Minoru Yamaga
摘要： A magnetic recording medium is used in a recording/reproduction apparatus having a shortest recording wavelength of not more than 75 nm, the magnetic recording medium including a recording layer that contains a powder of particles containing ε-iron oxide, in which a squareness ratio measured in a traveling direction of the magnetic recording medium is not more than 30%, a ratio (Dmax/Dmin) of an average longest diameter Dmax of the particles to an average shortest diameter Dmin of the particles satisfies a relationship of 1.0≤(Dmax/Dmin)≤1.1, an average thickness δmag of the recording layer is not more than 100 nm, and a ratio (δmag/Dmin) of the average thickness δmag of the recording layer to the average shortest diameter Dmin of the particles satisfies a relationship of δmag/Dmin≤5.
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公开(公告)号：US10204651B2
公开(公告)日：2019-02-12
申请号：US15316436
申请日：2015-04-10
申请人： Sony Corporation
发明人： Eiji Nakashio , Minoru Yamaga , Masaru Terakawa , Yoichi Kanemaki , Katsunori Maeshima , Jun Hashimoto
摘要： The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ε-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.
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