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1. 发明授权

US10580447B2 Magnetic recording medium with controlled surface characteristics 有权
公开(公告)号：US10580447B2
公开(公告)日：2020-03-03
申请号：US15573374
申请日：2016-05-12
申请人： Sony Corporation
发明人： Noboru Sekiguchi , Tomoe Ozaki , Tetsuo Endo , Takashi Aizawa , Junichi Tachibana , Hikaru Terui , Teruo Sai
IPC分类号： G11B5/667 , G11B5/66 , G11B5/733 , G11B5/65 , G11B5/70 , G11B5/73
摘要： A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.

2. 发明申请

US20170069343A1 MAGNETIC RECORDING MEDIUM 有权
标题翻译：磁记录介质
公开(公告)号：US20170069343A1
公开(公告)日：2017-03-09
申请号：US15208932
申请日：2016-07-13
申请人： Sony Corporation
发明人： Junichi Tachibana , Noboru Sekiguchi , Tomoe Ozaki
IPC分类号： G11B5/65 , G11B5/73 , G11B5/78
摘要： A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·αδ1.5(1−Rs)0.33), Ms, and α satisfy (Ms·α·δ1.5(1−Rs)0.33)≦0.1 [μ·emu·(mm)−1.5], Ms≧450 [emu/cc], and α≧1.2. In the above formulas, Ms indicates a saturated magnetization amount, α indicates the gradient of a M-H loop around a coercive force Hc, δ indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.
摘要翻译：磁记录介质包括基板，种子层，下层和具有颗粒结构的垂直记录层。（Ms·αδ1.5（1-Rs）0.33），Ms和α满足（Ms·α·δ1.5（1-Rs）0.33）≤0.1[μ·emu·（mm）-1.5]，Ms≥ 450 [emu / cc]，α≥1.2。在上式中，Ms表示饱和磁化量，α表示围绕矫顽力Hc的M-H环的梯度，δ表示垂直记录层的厚度，Rs表示矩形比。

3. 发明授权

US11621020B2 Magnetic recording medium 有权
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
IPC分类号： G11B5/667 , G11B5/73 , G11B5/65
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.

4. 发明授权

US11437066B2 Magnetic recording tape and magnetic recording tape cartridge 有权
公开(公告)号：US11437066B2
公开(公告)日：2022-09-06
申请号：US17040611
申请日：2019-02-14
申请人： SONY CORPORATION
发明人： Junichi Tachibana , Sogo Oikawa , Koji Suzuki , Teruo Sai , Tomoe Ozaki
IPC分类号： G11B5/73 , G11B5/65 , G11B5/78 , G11B5/667
摘要： To provide a magnetic recording tape and the like that have excellent magnetic properties and exhibit a favorable SNR. There are provided a magnetic recording tape and the like including at least: a base layer that includes a long film having flexibility; and a magnetic layer formed on a side of one main surface of the base layer, in which an under layer and a seed layer are provided in the stated order from a side of the magnetic layer toward a side of the base layer between the magnetic layer and the base layer, the underlayer contains at least Co and Cr, and has an average atomic number ratio represented by the following formula (1): Co(100-y)Cry (where y is within a range of 37≤y≤45.), and the seed layer formed directly on the base layer has a film thickness of 5 nm or more and 30 nm or less, and contains Ti and O and has an average atomic number ratio represented by the following formula (2): Ti(100-x)Ox (where x≤10.) or contains Ti—Cr—O and has an average atomic number ratio represented by the following formula (3): (TiCr)(100-x)Ox (where x≤10.).

5. 发明授权

US11423936B2 Magnetic recording medium and method of producing the same 有权
公开(公告)号：US11423936B2
公开(公告)日：2022-08-23
申请号：US14273694
申请日：2014-05-09
申请人： Sony Corporation
发明人： Junichi Tachibana , Jota Ito , Tomoe Ozaki , Ryoichi Hiratsuka , Noboru Sekiguchi , Tetsuo Endo
IPC分类号： G11B5/73 , G11B5/65
摘要： There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.

6. 发明授权

US10789979B2 Magnetic recording medium 有权
公开(公告)号：US10789979B2
公开(公告)日：2020-09-29
申请号：US15765600
申请日：2016-11-16
申请人： SONY CORPORATION
发明人： Junichi Tachibana , Tetsuo Endo , Tomoe Ozaki , Takashi Aizawa
IPC分类号： G11B5/667 , G11B5/725 , G11B5/73 , C23C14/00 , G11B5/65
摘要： A magnetic recording medium includes: an elongated substrate having flexibility; a first layer, being provided on the substrate, containing Cr, Ni, and Fe, and having a face-centered cubic lattice structure with a (111) plane preferentially oriented so as to be parallel to a surface of the substrate; a second layer, being provided on the first layer, containing Co and O, having a ratio of an average atomic concentration of O to an average atomic concentration of Co of 1 or more, and having a column structure with an average particle diameter of 3 nm or more and 13 nm or less; a third layer, being provided on the second layer, and containing Ru; and a perpendicular recording layer, being provided on the third layer.

7. 发明授权

US10529367B2 Magnetic recording medium 有权
公开(公告)号：US10529367B2
公开(公告)日：2020-01-07
申请号：US15521775
申请日：2015-11-16
申请人： Sony Corporation
发明人： Junichi Tachibana , Tetsuo Endo , Tomoe Ozaki , Hikaru Terui
IPC分类号： G11B5/66 , G11B5/78 , G11B5/65 , G11B5/667 , G11B5/725 , G11B5/73
摘要： A magnetic recording medium includes a long-shaped base substrate having flexibility, a soft magnetic layer, and a magnetic recording layer. A squareness ratio in a longitudinal direction of the base substrate is equal to or less than a squareness ratio in a short-side direction of the base substrate. The squareness ratio in the longitudinal direction of the base substrate is 30% or less.

8. 发明授权

US10424329B2 Magnetic recording medium 有权
公开(公告)号：US10424329B2
公开(公告)日：2019-09-24
申请号：US15208932
申请日：2016-07-13
申请人： Sony Corporation
发明人： Junichi Tachibana , Noboru Sekiguchi , Tomoe Ozaki
IPC分类号： G11B5/66 , G11B5/65 , G11B5/73 , G11B5/64 , G11B5/78
摘要： A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·αδ1.5(1−Rs)0.33), Ms, and α satisfy (Ms·α·δ1.5(1−Rs)0.33)≤0.1 [μ·emu·(mm)−1.5], Ms≥450 [emu/cc], and α≥1.2. In the above formulas, Ms indicates a saturated magnetization amount, α indicates the gradient of a M-H loop around a coercive force Hc, δ indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.

9. 发明申请

US20180137887A1 MAGNETIC RECORDING MEDIUM 审中-公开
公开(公告)号：US20180137887A1
公开(公告)日：2018-05-17
申请号：US15573374
申请日：2016-05-12
申请人： Sony Corporation
发明人： Noboru Sekiguchi , Tomoe Ozaki , Tetsuo Endo , Takashi Aizawa , Junichi Tachibana , Hikaru Terui , Teruo Sai
IPC分类号： G11B5/667 , G11B5/65
摘要： A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 μm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.

10. 发明授权

US09542967B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US09542967B2
公开(公告)日：2017-01-10
申请号：US14568423
申请日：2014-12-12
申请人： Sony Corporation
发明人： Noboru Sekiguchi , Tomoe Ozaki , Junichi Tachibana
IPC分类号： G11B5/708 , G11B5/66 , G11B5/65 , G11B5/667 , G11B5/64 , G11B5/73
CPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/656 , G11B5/667 , G11B5/7325
摘要： There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSDMD,short/PSDTD,short, and a ratio PSDMD,long/PSDTD,long on the surface satisfy Ra≦3.0 nm, PSDMD,short/PSDTD,short≦0.65, and 1.3≦PSDMD,long/PSDTD,long≦2.3, in which PSDMD,short is an average value of PSD values in a range from 0.15 μm to 0.4 μm in the longitudinal direction of the surface, PSDTD,short is an average value of PSD values in a range from 0.15 μm to 0.4 μm in the lateral direction of the surface, PSDMD,long is an average value of PSD values in a range from 0.4 μm to 5.0 μm in the longitudinal direction of the surface, and PSDTD,long is an average value of PSD values in a range from 0.4 μm to 5.0 μm in the lateral direction of the surface.
摘要翻译：提供了包括具有纵向和横向的表面的磁记录介质。表面上的算术平均粗糙度Ra，比率PSDMD，短/ PSDTD，短和PSDMD，长/ PSDTD长，满足Ra≤3.0nm，PSDMD，短/ PSDTD，短≤0.65和1.3≤PSDMD，长/ PSDTD，长≤2.3，其中PSDMD是表面纵向方向上0.15μm至0.4μm范围内的PSD值的平均值，PSDTD，short是范围内的PSD值的平均值在表面的横向方向上从0.15μm到0.4μm的PSDMD是在表面的纵向方向上在0.4μm至5.0μm的范围内的PSD值的平均值，PSDD是长度是平均值 PSD值在表面的横向方向上在0.4μm至5.0μm的范围内。

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