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51. 发明申请

US20060014051A1 Perpendicular magnetic recording medium and method of manufacturing the same 审中-公开
标题翻译：垂直磁记录介质及其制造方法
公开(公告)号：US20060014051A1
公开(公告)日：2006-01-19
申请号：US11155017
申请日：2005-06-16
申请人： Akiro Iso , Hiroyuki Uwazumi
发明人： Akiro Iso , Hiroyuki Uwazumi
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/65 , G11B5/7325 , G11B5/851
摘要： A perpendicular magnetic recording medium and a method of manufacturing the same include a nonmagnetic substrate, a nonmagnetic underlayer, and a magnetic layer disposed directly on the nonmagnetic underlayer. The magnetic layer is composed of ferromagnetic crystal grains having a hexagonal close-packed structure and nonmagnetic grain boundaries composed of oxide or nitride surrounding each of the ferromagnetic crystal grains. The surface energy of the nonmagnetic underlayer is made to be at least 70 mN/m. The nonmagnetic underlayer can be composed of a metal selected from rhenium, ruthenium, and osmium, or an alloy containing at least an element selected from rhenium, ruthenium, and osmium, and can have a thickness of 30 nm or less.
摘要翻译：垂直磁记录介质及其制造方法包括非磁性基板，非磁性底层和直接设置在非磁性底层上的磁性层。磁性层由具有六方密堆积结构的铁磁晶粒和围绕每个铁磁晶粒的氧化物或氮化物构成的非磁性晶界构成。非磁性底层的表面能为70mN / m以上。非磁性底层可以由选自铼，钌和锇的金属或至少含有选自铼，钌和锇的元素的合金构成，并且可以具有30nm以下的厚度。

52. 发明申请

US20050238926A1 Substrate for a perpendicular magnetic recording medium and a perpendicular magnetic recording medium using the substrate 审中-公开
标题翻译：用于垂直磁记录介质的基板和使用该基板的垂直磁记录介质
公开(公告)号：US20050238926A1
公开(公告)日：2005-10-27
申请号：US11078199
申请日：2005-03-11
申请人： Hiroyuki Uwazumi , Norihiko Nakajima , Tatsumi Kawata , Kazuhito Higuchi
发明人： Hiroyuki Uwazumi , Norihiko Nakajima , Tatsumi Kawata , Kazuhito Higuchi
IPC分类号： G11B5/667 , A61B6/00 , G01N23/00 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/84 , G21K1/12 , H04N5/325 , H05G1/60
CPC分类号： G11B5/667
摘要： A substrate for a perpendicular magnetic recording medium and a perpendicular magnetic recording medium using such a substrate are disclosed. The substrate exhibits sufficient productivity and functions as a soft magnetic backing layer of a perpendicular magnetic recording medium based on the substrate, ensuring surface hardness. The substrate comprises a nonmagnetic base plate composed of an aluminum alloy, an adhesion layer formed on the nonmagnetic base plate and composed of a material containing at least nickel, and a soft magnetic underlayer formed on the adhesion layer by means of an electroless plating method. The soft magnetic underlayer contains phosphorus in a range of 3 at % to 20 at %, and at least 25 at % of cobalt in proportion to the number of atoms of cobalt and nickel excluding the phosphorus (Co/(Co+Ni)). Thickness of the adhesion layer is at least 0.1 μm. Thickness of the soft magnetic underlayer is at least 0.2 μm, and a sum of the thickness of the adhesion layer and the thickness of the soft magnetic underlayer is at least 3 μm.
摘要翻译：公开了一种用于垂直磁记录介质的基板和使用这种基板的垂直磁记录介质。该基材表现出足够的生产率并且作为基于该基材的垂直磁记录介质的软磁背衬层起着保证表面硬度的作用。基板包括由铝合金构成的非磁性基板，形成在非磁性基板上的由至少含有镍的材料构成的粘合层，以及通过无电镀法形成在粘合层上的软磁性底层。软磁性底层的磷含量（Co /（Co + Ni））不包括钴和镍的原子数的比例为3原子％至20原子％，至少25原子％的磷。粘合层的厚度为0.1μm以上。软磁性底层的厚度为0.2μm以上，粘着层的厚度与软磁性底层的厚度之和为3μm以上。

53. 发明授权

US06770388B2 Perpendicular magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：US06770388B2
公开(公告)日：2004-08-03
申请号：US10209674
申请日：2002-07-31
申请人： Hiroyuki Uwazumi , Teruhisa Yokosawa
发明人： Hiroyuki Uwazumi , Teruhisa Yokosawa
IPC分类号： G11B566
CPC分类号： G11B5/82 , B82Y10/00 , G11B5/667 , G11B5/743 , Y10T428/24355
摘要： A perpendicular magnetic recording medium has a nonmagnetic substrate having concave portions and a soft magnetic layer on the nonmagnetic substrate. The depth of the concave portion and the thickness of the soft magnetic layer are larger than at least the length and the width of the concave portion such that the easy axis of magnetization in the regions of the soft magnetic layer in the concave portions is oriented perpendicular to the soft magnetic layer due to shape magnetic anisotropy. The easy axis of magnetization oriented perpendicular to the soft magnetic layer facilitates signal generation. The recording medium does not use the magnetization of the magnetic recording layer for such signal generation, which can be head positioning signals or other signals, such as copyright data. Instead, it uses the magnetization in the concave regions of the soft magnetic layer for such signal generation.
摘要翻译：垂直磁记录介质具有在非磁性基底上具有凹陷部分和软磁性层的非磁性基底。凹部的深度和软磁性层的厚度至少大于凹部的长度和宽度，使得凹部中的软磁性层的区域中的易磁化轴取向垂直由于形状磁各向异性而导致软磁性层。垂直于软磁层的易磁化轴有助于信号产生。记录介质不会使用用于这种信号生成的磁记录层的磁化，其可以是头定位信号或诸如版权数据的其它信号。相反，它使用软磁层的凹区域中的磁化来产生这种信号。

54. 发明授权

US5843561A Magnetic recording medium and method for manufacturing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5843561A
公开(公告)日：1998-12-01
申请号：US639676
申请日：1996-04-29
申请人： Hiroyuki Uwazumi , Naoki Takizawa , Noboru Kurata
发明人： Hiroyuki Uwazumi , Naoki Takizawa , Noboru Kurata
IPC分类号： G11B5/66 , G11B5/73 , G11B5/84
CPC分类号： G11B5/7325 , G11B5/66 , G11B5/8404 , Y10S428/90 , Y10T428/24355 , Y10T428/265
摘要： A magnetic recording medium includes an uneven layer, a non-magnetic metal base layer, a magnetic layer and a protective layer which are laminated on a non-magnetic base in the order of description. The uneven layer includes non-magnetic metal deposits containing nitrogen or oxygen, and consists of mutually isolated protrusions having a crystalline phase, which are discretely dispersed on the surface of the non-magnetic base, and a connecting layer having an amorphous phase for filling spaces between the protrusions so as to connect the protrusions with each other.
摘要翻译：按照说明书的顺序，磁记录介质包括层叠在非磁性基底上的不平坦层，非磁性金属基层，磁性层和保护层。不均匀层包括含有氮或氧的非磁性金属沉积物，并且由离散地分散在非磁性基底的表面上的具有结晶相的相互隔离的突起组成，并且具有用于填充空间的非晶相的连接层在所述突起之间，以使所述突起彼此连接。

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