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1. 发明专利

JP2004079043A Perpendicular magnetic recording medium 审中-公开
公开(公告)号：JP2004079043A
公开(公告)日：2004-03-11
申请号：JP2002235777
申请日：2002-08-13
申请人： Fuji Electric Holdings Co Ltd , 富士電機ホールディングス株式会社
发明人： UWAZUMI HIROYUKI , SAKAI YASUSHI , TAKENOIRI SHUNJI , SHIMAZU TAKEHITO , MURAOKA HIROAKI , NAKAMURA YOSHIHISA
IPC分类号： G11B5/667 , G11B5/673 , G11B5/73 , G11B5/738
CPC分类号： G11B5/667
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having an excellent spike noise suppression effect.
SOLUTION: A soft magnetic lining layer is formed in a three or five-layer stacked structure in which a nonmagnetic metal layer made of a metal selected from Cu, Ru, Rh, Pd, Re, Os, Ir, Pt, Au or an alloy thereof, and having a film thickness of 5 nm or more, and a soft magnetic layer having a film thickness of 10 nm or higher so that uppermost and lowermost layers become soft magnetic layers, and magnetization directions are set parallel to a film surface so that the magetization directions of the upper and lower soft magnetic layers sandwiching the nonmagnetic metal layer are different from each other by 180°, whereby mutual antiferromagnetic coupling is realized. Thus, no magnetic wall is formed against a magnetic field applied from the outside and, as a result, a soft magnetic lining layer in which no spike noise is generated is formed.
COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2005149603A Magnetic disk substrate for vertical recording, and its grinding method 有权
标题翻译：用于垂直记录的磁盘基板及其研磨方法
公开(公告)号：JP2005149603A
公开(公告)日：2005-06-09
申请号：JP2003384292
申请日：2003-11-13
申请人： Fuji Electric Holdings Co Ltd , 富士電機ホールディングス株式会社
发明人： KAWADA TATSUMI , NAKAJIMA NORIHIKO , MASUDA MITSUO , UWAZUMI HIROYUKI
IPC分类号： B24B1/00 , B24B37/00 , G11B5/667 , G11B5/82 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To excellently grind a Ni-low-P-layer formed on a substrate in a short time. SOLUTION: A surface of the substrate is ground by supplying successively slurry 61 including abrasive materials in which pH is adjusted to acidity of 4 or less and slurry 63 including abrasive materials in which pH is adjusted to alkalinity of 8 or more between the substrate and the abrasive members in a state in which the substrate 59 is pressed by the abrasive members 53, 55 while relatively moving the substrate 59 for vertical magnetic recording medium in which a soft magnetic substrate layer consisting of Ni-P group alloy including P of 0.5 wt% or more 6 wt% or less on a nonmagnetic substrate and the abrasive members 53, 55. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：在短时间内优良地研磨在基板上形成的Ni-low-P层。解决方案：通过依次供应浆料61研磨基材的表面，浆料61包括其中pH调节至4或更低的酸度的研磨材料，以及包括研磨材料的浆料63，其中将pH调节至碱度为8以上衬底和研磨构件，其中衬底59被研磨构件53,55挤压，同时相对移动用于垂直磁记录介质的衬底59，其中由Ni-P族合金组成的软磁性衬底层包括P 0.5重量％以上6重量％以下的非磁性基材和研磨部件53,55。（C）2005，JPO＆NCIPI

3. 发明专利

JP2008065879A Perpendicular magnetic recording medium 有权
标题翻译：全能磁记录介质
公开(公告)号：JP2008065879A
公开(公告)日：2008-03-21
申请号：JP2006240161
申请日：2006-09-05
申请人： Fuji Electric Holdings Co Ltd , Tohoku Univ , 国立大学法人東北大学 , 富士電機ホールディングス株式会社
发明人： SHIMAZU TAKEHITO , AOI MOTOI , KITAGAMI OSAMU , WATANABE SADAYUKI , UWAZUMI HIROYUKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , H01F10/16 , H01F10/32
摘要： PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having high recording resolution, high signal stability, high writing performance and excellent characteristic uniformity.
SOLUTION: In the perpendicular magnetic recording medium formed by sequentially layering at least an underlayer 4, a magnetic recording layer 5 and a protective layer 6 on a non-magnetic base body 1, the magnetic recording layer 5 includes at least a structure formed by sequentially layering a first magnetic layer (5-1), an exchange coupling control layer (5-2) and a second magnetic layer (5-3), the first and the second magnetic layers have constants (Ku) of perpendicular magnetic anisotropy different from each other, at least the magnetic layer having a higher Ku value in both magnetic layers includes a non-magnetic oxide, the exchange coupling control layer (5-2) includes a crystalline metal or an alloy and an oxide and the crystalline metal or the alloy is Pt or Pd or an alloy containing those or an alloy comprising an element selected from Co, Ni and Fe and a non-magnetic metal.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供具有高记录分辨率，高信号稳定性，高写入性能和优异特性均匀性的垂直磁记录介质。解决方案：在通过在非磁性基体1上顺序分层至少底层4，磁记录层5和保护层6而形成的垂直磁记录介质中，磁记录层5至少包括结构通过顺序层叠第一磁性层（5-1），交换耦合控制层（5-2）和第二磁性层（5-3）形成，第一和第二磁性层具有垂直磁性的常数（Ku）各向异性彼此不同，至少在两个磁性层中具有较高Ku值的磁性层包括非磁性氧化物，交换耦合控制层（5-2）包括结晶金属或合金和氧化物，并且结晶金属或合金是Pt或Pd或包含那些或包含选自Co，Ni和Fe的元素的合金和非磁性金属的合金。版权所有（C）2008，JPO＆INPIT

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