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1. 发明专利

JP2007272999A Substrate for magnetic recording medium, its manufacturing method and magnetic recording medium 审中-公开
标题翻译：磁记录介质基板及其制造方法及磁记录介质
公开(公告)号：JP2007272999A
公开(公告)日：2007-10-18
申请号：JP2006097603
申请日：2006-03-31
申请人： Shin Etsu Chem Co Ltd , 信越化学工業株式会社
发明人： ITO TAKU , OHASHI TAKESHI
IPC分类号： G11B5/73 , G11B5/667 , G11B5/84 , G11B5/858
CPC分类号： G11B5/667 , G11B5/7325 , G11B5/8404 , G11B5/858
摘要： PROBLEM TO BE SOLVED: To provide a substrate suitable for manufacturing a perpendicular magnetic recording medium having low noise and satisfactory signal reproducing characteristics and to provide its manufacturing method.
SOLUTION: A soft magnetic backing layer 12 is formed on a non-magnetic substrate 11 by an electroless plating method. The soft magnetic backing layer formed by the plating method is subjected to heat treatment in a magnetic field by selecting conditions of 150 to 350°C heat treatment temperature, ≥50 Oersted (Oe) magnetic field intensity applied to the substrate and 5 to 10 hr treatment time. Magnetic anisotropy wherein an absolute value of the difference (δH=H
d -H
c ) between a magnetization saturation magnetic field (H
d ) in an in-plane radial direction of the soft magnetic film and a magnetization saturation magnetic field (H
c ) in an in-plane circumferential direction is 5 Oersted (Oe) or more and which has symmetry with respect to a center axis of the substrate is imparted by the heat treatment in the magnetic field. The soft magnetic backing layer having the magnetic anisotropy is effective for noise reduction and controllability and reproducibility of the degree of the magnetic anisotropy are high.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供适于制造具有低噪声和令人满意的信号再现特性的垂直磁记录介质的基板，并提供其制造方法。解决方案：通过无电镀方法在非磁性基板11上形成软磁性背衬层12。通过选择150〜350℃的热处理温度，施加到基板上的≥50奥斯特（Oe）磁场强度和5〜10小时的条件，通过电镀法形成的软磁性背衬层在磁场中进行热处理治疗时间。磁化各向异性，其中磁化饱和磁场（H d ）之间的差异的绝对值（δH= H H c ）软磁性膜的面内径向方向和面内圆周方向的磁化饱和磁场（H c ）为5奥斯特（Oe）以上，并且相对于通过在磁场中的热处理赋予基板的中心轴。具有磁各向异性的软磁背衬层对于降低噪声和可控性是有效的，并且磁各向异性程度的再现性高。版权所有（C）2008，JPO＆INPIT

2. 发明专利

JP2007280455A Substrate for magnetic recording medium, its manufacturing method, and magnetic recording medium 审中-公开
标题翻译：用于磁记录介质的基板，其制造方法和磁记录介质
公开(公告)号：JP2007280455A
公开(公告)日：2007-10-25
申请号：JP2006102832
申请日：2006-04-04
申请人： Shin Etsu Chem Co Ltd , 信越化学工業株式会社
发明人： OHASHI TAKESHI , ITO TAKU , HAMAGUCHI MASARU
IPC分类号： G11B5/667 , G11B5/73 , G11B5/738 , G11B5/858 , H01F10/16 , H01F41/26
摘要： PROBLEM TO BE SOLVED: To provide a substrate suitable for manufacturing a perpendicular magnetic recording medium having low-noise and satisfactory signal reproduction characteristics.
SOLUTION: A soft magnetic backing layer 12 is formed on a nonmagnetic substrate 11 by electroless plating method. The soft magnetic backing layer formed by the plating is subjected to heat treatment in a magnetic field with conditions selected in a range such that the heat treatment temperature is ≥250°C and ≤350°C and magnetic field intensity applied to the substrate is 10 kOe or more. According to the heat treatment in the magnetic field, the magnetic anisotropy is provided, in which the absolute value difference (δH=H
d -H
c ) between magnetization saturation magnetic field intensity (H
d ) of a soft magnetic film in an in-plane radial direction and magnetization saturation magnetic field intensity (H
c ) in an in-plane circumferential direction is 5 Oe or more, and which has symmetry with respect to substrate central axis, wherein noise of low-frequency region due to a ripple structure of the soft magnetic film at 20 MHz is not more than half of the noise of low-frequency region before the heat treatment. The soft magnetic backing layer having such magnetic anisotropy is effective in reducing noise.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供适于制造具有低噪声和令人满意的信号再现特性的垂直磁记录介质的基板。解决方案：通过无电镀方法在非磁性基板11上形成软磁性背衬层12。通过电镀形成的软磁性背衬层在磁场中进行热处理，所述磁场的条件是在热处理温度为≥250℃和≤350℃的范围内选择，并且施加到基板的磁场强度为10 kOe以上。根据磁场的热处理，提供磁各向异性，其中磁饱和磁场之间的绝对值差（δH= H d -H c ）软磁性膜在面内半径方向上的强度（H d ）和面内周向的磁化饱和磁场强度（H c ）为5 Oe以上，并且对于衬底中心轴具有对称性，其中由于软磁膜在20MHz处的纹波结构引起的低频区域的噪声不超过在20MHz之前的低频区域的噪声的一半热处理。具有这种磁各向异性的软磁背衬层有效降低噪音。版权所有（C）2008，JPO＆INPIT

3. 发明专利

JP2007164963A Substrate for magnetic recording medium, fabrication method thereof and magnetic recording medium 审中-公开
标题翻译：用于磁记录介质的基板，其制造方法和磁记录介质
公开(公告)号：JP2007164963A
公开(公告)日：2007-06-28
申请号：JP2006304269
申请日：2006-11-09
申请人： Shin Etsu Chem Co Ltd , 信越化学工業株式会社
发明人： ITO TAKU , OHASHI TAKESHI
IPC分类号： G11B5/667 , G11B5/73 , G11B5/82 , G11B5/858
摘要： PROBLEM TO BE SOLVED: To provide a substrate suitable for manufacturing a perpendicular magnetic recording medium having low noise and satisfactory signal reproducing characteristics, and a fabrication method thereof. SOLUTION: Heat treatment is performed on a plated soft magnetic film, so that liquid components and gaseous components having been taken in the film during a plating step are eliminated. The temperature of the heat treatment is preferably set at 100 to 350C°. The heat treatment is effective when being divided into at least two times of heat treatment: a first heat treatment performed before a polishing step and a second heat treatment performed after the polishing step. Since much liquid gaseous components are contained in the film in the first heat treatment, the first heat treatment is performed in a comparatively loose condition so that a structural defect is not generated in the film by the elimination of these components. Accordingly, the first heat treatment temperature is preferably set to be lower than the second heat treatment temperature. It is effective for imparting magnetic anisotropy to the soft magnetic film to perform the first and the second heat treatment under magnetic field applying environment. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供适合于制造具有低噪声和令人满意的信号再现特性的垂直磁记录介质的基板及其制造方法。解决方案：在镀覆的软磁膜上进行热处理，从而消除了在电镀步骤期间已经被吸入到膜中的液体组分和气体组分。热处理的温度优选设定为100〜350℃。热处理在分为至少两次热处理时是有效的：在研磨步骤之前进行的第一热处理和在抛光步骤之后执行的第二热处理。由于在第一热处理中在膜中含有多量液体气体成分，因此在比较松散的条件下进行第一热处理，从而通过消除这些成分而不会在膜中产生结构缺陷。因此，优选将第一热处理温度设定为低于第二热处理温度。赋予软磁性膜的磁各向异性以在磁场施加环境下进行第一和第二热处理是有效的。版权所有（C）2007，JPO＆INPIT

4. 发明专利

JP2007287216A Substrate for magnetic recording medium, its manufacturing method and magnetic recording medium 审中-公开
标题翻译：磁记录介质基板及其制造方法及磁记录介质
公开(公告)号：JP2007287216A
公开(公告)日：2007-11-01
申请号：JP2006111652
申请日：2006-04-14
申请人： Shin Etsu Chem Co Ltd , 信越化学工業株式会社
发明人： ITO TAKU , TSUMORI TOSHIHIRO , HAMAGUCHI MASARU
IPC分类号： G11B5/667 , G11B5/73 , G11B5/738 , G11B5/852 , G11B5/858
摘要： PROBLEM TO BE SOLVED: To provide a substrate suitable for manufacturing a perpendicular magnetic recording medium having low noise and satisfactory signal forming characteristics.
SOLUTION: An under plating layer 16 is formed by subjecting an Si substrate 11 to surface treatment to chemically activate the surface thereof and form an adequate ruggedness (R
a :1 nm to 1 μm). The under plating layer 16 is made of metal or an alloy comprising one or more metal elements selected from the group consisting of Ni, Cu and Ag and has 1 to 500 nm thickness. A soft magnetic backing layer 12 is formed on the under plating layer 16 by an electroplating or electroless plating method. The soft magnetic backing layer 12 is a film having a composition containing 40 to 60 at% Co, 20 to 40 at% Ni and 10 to 40 at% Fe as a main component and 50 to 1,000 nm film thickness. By such film constitution, the soft magnetic backing film capable of suppressing spike noise without using steps for film-depositing an anti-ferromagnetic film and performing thermal treatment in a magnetic field can be formed by the plating method.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供适合于制造具有低噪声和令人满意的信号形成特性的垂直磁记录介质的基板。解决方案：通过对Si衬底11进行表面处理以化学活化其表面并形成足够的耐用性（R SB a 1/1至1μm），形成底镀层16。底镀层16由金属或包含一种或多种选自Ni，Cu和Ag的金属元素的合金制成，厚度为1〜500nm。通过电镀或无电镀方法在下镀层16上形成软磁背衬层12。软磁性背衬层12是具有40〜60at％的Co，20〜40at％的Ni和10〜40at％的Fe作为主要成分，50〜1000nm的膜厚的组成的膜。通过这样的膜结构，可以通过电镀法形成能够抑制尖峰噪声而不用用于沉积反铁磁性膜并进行磁场热处理的步骤的软磁背衬膜。版权所有（C）2008，JPO＆INPIT

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