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公开(公告)号：US20170249966A1
公开(公告)日：2017-08-31
申请号：US15521775
申请日：2015-11-16
Applicant: Sony Corporation
Inventor： Junichi TACHIBANA , Tetsuo ENDO , Tomoe OZAKI , Hikaru TERUI
Abstract: 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.
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公开(公告)号：US20150194174A1
公开(公告)日：2015-07-09
申请号：US14568423
申请日：2014-12-12
Applicant: Sony Corporation
Inventor： Noboru SEKIGUCHI , Tomoe OZAKI , Junichi TACHIBANA
Abstract: 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.
Abstract translation: 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，短和比PSDID，长/ PSDTD长，满足Ra＆nlE; 3.0nm，PSDMD，short / PSDTD，short＆nlE; 0.65和1.3＆nlE; PSDMD 长/ PSDTD，long＆nlE; 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PSDTD中PSD值的平均值 在表面的横向方向为0.15μm〜0.4μm的范围，PSDMD长为在表面的长度方向上的0.4μm〜5.0μm的范围内的PSD值的平均值，PSDTD，long是平均值 的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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公开(公告)号：US20150279402A1
公开(公告)日：2015-10-01
申请号：US14666581
申请日：2015-03-24
Applicant: Sony Corporation
Inventor： Noboru SEKIGUCHI , Junichi TACHIBANA , Tetsuo ENDO , Tomoe OZAKI , Hikaru TERUI
CPC classification number: G11B5/667 , G11B5/64 , G11B5/7325 , G11B5/738 , G11B5/851
Abstract: A magnetic recording medium includes a base material which has flexibility, a lower coating layer, and a recording layer, in which, in X-ray diffraction peaks, a value of Δθ50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method is 5° or more to less than 10°.
Abstract translation: 磁记录介质包括具有柔性的基材，下涂层和记录层，其中在X射线衍射峰中具有包含的磁性原子的衍射峰值 在记录层中通过锁定曲线法测量的是5°以上至小于10°。
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公开(公告)号：US20190080712A1
公开(公告)日：2019-03-14
申请号：US15765600
申请日：2016-11-16
Applicant: SONY CORPORATION
Inventor： Junichi TACHIBANA , Tetsuo ENDO , Tomoe OZAKI , Takashi AIZAWA
Abstract: 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.
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