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1. 发明申请

US20050037238A1 Perpendicular magnetic recording medium and method for production thereof 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：US20050037238A1
公开(公告)日：2005-02-17
申请号：US10934555
申请日：2004-09-07
申请人： Yasushi Sakai , Akihiro Ohtsuki , Keiji Ohkubo , Kazuo Enomoto , Sadayuki Watanabe , Takahiko Tamaki , Kiyoshi Kuga , Eiichi Miyashita , Ryo Taguchi
发明人： Yasushi Sakai , Akihiro Ohtsuki , Keiji Ohkubo , Kazuo Enomoto , Sadayuki Watanabe , Takahiko Tamaki , Kiyoshi Kuga , Eiichi Miyashita , Ryo Taguchi
IPC分类号： C23C14/14 , C23C14/34 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/851 , H01F10/13 , H01F41/18 , B05D5/12 , B05D1/36 , B05D3/08
CPC分类号： G11B5/667 , G11B5/7325 , G11B5/851
摘要： The present invention provides a method for easily obtaining a perpendicular magnetic recording medium having the desired magnetic properties by sputtering, and a magnetic recording medium obtained by this method. The perpendicular magnetic recording medium of the present invention is a perpendicular magnetic recording medium comprising at least a soft magnetic underlayer, an underlayer, a magnetic recording layer, a protective layer, and a liquid lubricant layer sequentially laminated on a nonmagnetic substrate, wherein the magnetic recording layer is a rare earth-transition metal alloy amorphous film formed by sputtering, and the formation of the magnetic recording layer by sputtering is performed using a film-forming gas incorporating 2% or more, but 60% or less of an H2 gas. The present invention also discloses a method for producing the perpendicular magnetic recording medium.
摘要翻译：本发明提供一种通过溅射容易地获得具有所需磁特性的垂直磁记录介质的方法和通过该方法获得的磁记录介质。本发明的垂直磁记录介质是至少包括依次层压在非磁性基板上的软磁性底层，底层，磁记录层，保护层和液体润滑剂层的垂直磁记录介质，其中磁性记录层是通过溅射形成的稀土 - 过渡金属合金非晶膜，并且通过溅射形成磁记录层是使用包含2％以上但60％以下的H 2气的成膜气体进行的。本发明还公开了一种垂直磁记录介质的制造方法。

2. 发明申请

US20050186358A1 Perpendicular magnetic recording medium and fabrication method thereof 失效
公开(公告)号：US20050186358A1
公开(公告)日：2005-08-25
申请号：US11115312
申请日：2005-04-27
申请人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
发明人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
IPC分类号： G11B5/65 , G11B5/66 , G11B5/667 , G11B5/738 , G11B5/851 , H01F1/00
CPC分类号： G11B5/66 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12778 , Y10T428/12826 , Y10T428/12847 , Y10T428/12854 , Y10T428/12861 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
摘要： A perpendicular magnetic recording medium and method thereof, includes a nonmagnetic substrate; a soft magnetic under layer; an intermediate layer; a bilayer magnetic recording layer; a protective layer; and a liquid lubricant layer. According to a following order, the soft magnetic under layer, the intermediate layer, the bilayer magnetic recording layer, the protective layer, and the liquid lubricant layer are sequentially stacked on the nonmagnetic substrate. The bilayer magnetic recording layer includes a first magnetic layer including a CoCr alloy crystalline film, and a second magnetic layer including a rare earth-transition metal alloy noncrystalline film.

3. 发明授权

US07635498B2 Fabrication method for perpendicular magnetic recording media 失效
标题翻译：垂直磁记录介质的制作方法
公开(公告)号：US07635498B2
公开(公告)日：2009-12-22
申请号：US11115312
申请日：2005-04-27
申请人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
发明人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
IPC分类号： B05D5/12 , H01F1/00 , G11B5/81 , G11B5/84
CPC分类号： G11B5/66 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12778 , Y10T428/12826 , Y10T428/12847 , Y10T428/12854 , Y10T428/12861 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
摘要： A perpendicular magnetic recording medium and method thereof, includes a nonmagnetic substrate; a soft magnetic under layer; an intermediate layer; a bilayer magnetic recording layer; a protective layer; and a liquid lubricant layer. According to a following order, the soft magnetic under layer, the intermediate layer, the bilayer magnetic recording layer, the protective layer, and the liquid lubricant layer are sequentially stacked on the nonmagnetic substrate. The bilayer magnetic recording layer includes a first magnetic layer including a CoCr alloy crystalline film, and a second magnetic layer including a rare earth-transition metal alloy noncrystalline film.
摘要翻译：一种垂直磁记录介质及其方法，包括非磁性基板; 软磁下层; 中间层双层磁记录层; 保护层; 和液体润滑剂层。根据以下顺序，将软磁性层，中间层，双层磁记录层，保护层和液体润滑剂层依次层叠在非磁性基板上。双层磁记录层包括具有CoCr合金结晶膜的第一磁性层和包括稀土 - 过渡金属合金非晶膜的第二磁性层。

4. 发明授权

US06913837B2 Perpendicular magnetic recording medium and fabrication method thereof 失效
标题翻译：垂直磁记录介质及其制造方法
公开(公告)号：US06913837B2
公开(公告)日：2005-07-05
申请号：US10189784
申请日：2002-07-08
申请人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
发明人： Yasushi Sakai , Hiroyuki Uwazumi , Kazuo Enomoto , Sadayuki Watanabe
IPC分类号： G11B5/65 , G11B5/66 , G11B5/667 , G11B5/738 , G11B5/851
CPC分类号： G11B5/66 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12778 , Y10T428/12826 , Y10T428/12847 , Y10T428/12854 , Y10T428/12861 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
摘要： A perpendicular magnetic recording medium and method thereof, includes a nonmagnetic substrate; a soft magnetic under layer; an intermediate layer; a bilayer magnetic recording layer; a protective layer; and a liquid lubricant layer. According to a following order, the soft magnetic under layer, the intermediate layer, the bilayer magnetic recording layer, the protective layer, and the liquid lubricant layer are sequentially stacked on the nonmagnetic substrate. The bilayer magnetic recording layer includes a first magnetic layer including a CoCr alloy crystalline film, and a second magnetic layer including a rare earth-transition metal alloy noncrystalline film.
摘要翻译：一种垂直磁记录介质及其方法，包括非磁性基板; 软磁下层; 中间层双层磁记录层; 保护层; 和液体润滑剂层。根据以下顺序，将软磁性层，中间层，双层磁记录层，保护层和液体润滑剂层依次层叠在非磁性基板上。双层磁记录层包括具有CoCr合金结晶膜的第一磁性层和包括稀土 - 过渡金属合金非晶膜的第二磁性层。

5. 发明申请

US20060147760A1 Perpendicular magnetic recording medium 审中-公开
标题翻译：垂直磁记录介质
公开(公告)号：US20060147760A1
公开(公告)日：2006-07-06
申请号：US11293875
申请日：2005-12-02
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Shunji Takenoiri , Sadayuki Watanabe
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Shunji Takenoiri , Sadayuki Watanabe
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/7325
摘要： A perpendicular magnetic recording medium is provided that achieves excellent magnetic performance by suppressing spike noises due to a soft magnetic backing layer, as well as good productivity. The perpendicular magnetic recording medium comprises at least a soft magnetic backing layer, an antiferromagnetic layer, an nonmagnetic underlayer, and a magnetic recording layer sequentially laminated on a nonmagnetic substrate, wherein the magnetic recording layer has a granular structure, the nonmagnetic underlayer is composed of ruthenium or a ruthenium alloy having an hcp structure having a thickness of at least 5 nm, the antiferromagnetic layer is composed of an alloy having an fcc structure and containing at least manganese, and the antiferromagnetic layer is laminated directly on the soft magnetic backing layer. Preferably, the antiferromagnetic layer is composed of an IrMn alloy, and the soft magnetic backing layer has an fcc structure and contains at least nickel and iron. Advantageously, the soft magnetic backing layer consists of two or more directly laminated soft magnetic layers, and a distance between a top surface of the soft magnetic backing layer and a bottom surface of the magnetic recording layer is at most 25 nm.
摘要翻译：提供一种垂直磁记录介质，其通过抑制由于软磁背衬层引起的尖峰噪声以及良好的生产率而实现优异的磁性能。垂直磁记录介质至少包括软磁背衬层，反铁磁层，非磁性底层和依次层压在非磁性基板上的磁记录层，其中磁记录层具有颗粒结构，非磁性底层由钌或具有厚度至少为5nm的hcp结构的钌合金，反铁磁层由具有fcc结构并至少含有锰的合金构成，反铁磁层直接层压在软磁性背衬层上。优选地，反铁磁层由IrMn合金构成，并且软磁背衬层具有fcc结构并且至少包含镍和铁。有利地，软磁背衬层由两个或更多个直接层压的软磁性层组成，并且软磁背衬层的顶表面与磁记录层的底表面之间的距离至多为25nm。

6. 发明申请

US20050153169A1 Perpendicular magnetic recording medium and a method for manufacturing the same 有权
标题翻译：垂直磁记录介质及其制造方法
公开(公告)号：US20050153169A1
公开(公告)日：2005-07-14
申请号：US10867568
申请日：2004-06-14
申请人： Sadayuki Watanabe , Yasushi Sakai , Hiroyuki Uwazumi
发明人： Sadayuki Watanabe , Yasushi Sakai , Hiroyuki Uwazumi
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/73 , G11B5/738 , G11B5/84 , G11B5/851 , G11B5/68
CPC分类号： G11B5/732 , G11B5/65 , G11B5/656 , G11B5/66 , G11B5/667 , G11B5/7325 , G11B5/84 , G11B5/851
摘要： A perpendicular magnetic recording medium has a magnetic recording layer and laminated magnetic layers composed of different materials. In a first magnetic layer of the magnetic recording layer, ferromagnetic grains are surrounded by a nonmagnetic grain boundary region composed principally of oxide and/or nitride. In a second magnetic layer of the magnetic recording layer, ferromagnetic grains are surrounded by a nonmagnetic grain boundary region composed principally of chromium. The recording medium has an intermediate layer composed of a material having hcp or fcc structure. Advantageously, a heating process is conducted after forming the first magnetic layer and before forming the second magnetic layer. The medium achieves improvement in electromagnetic conversion characteristics and simultaneously improvement in corrosion resistance to provide a perpendicular magnetic recording medium with high recording density and simultaneously high reliability.
摘要翻译：垂直磁记录介质具有由不同材料组成的磁记录层和层叠磁性层。在磁记录层的第一磁性层中，铁磁颗粒被主要由氧化物和/或氮化物组成的非磁性晶界区包围。在磁记录层的第二磁性层中，铁磁颗粒被主要由铬组成的非磁性晶界区包围。记录介质具有由具有hcp或fcc结构的材料构成的中间层。有利地，在形成第一磁性层之后并在形成第二磁性层之前进行加热过程。该介质实现了电磁转换特性的提高，同时提高了耐腐蚀性，提供了具有高记录密度和同时高可靠性的垂直磁记录介质。

7. 发明申请

US20050123807A1 Magnetic recording medium and the method of manufacturing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20050123807A1
公开(公告)日：2005-06-09
申请号：US11037880
申请日：2005-01-18
申请人： Sadayuki Watanabe , Yasushi Sakai
发明人： Sadayuki Watanabe , Yasushi Sakai
IPC分类号： G11B5/72 , G11B5/64
CPC分类号： G11B5/72
摘要： A method of manufacturing a magnetic recording media includes a magnetic recording layer of a granular magnetic layer that has ferromagnetic crystal grains and an oxide nonmagnetic grain boundary or a nitride nonmagnetic grain boundary surrounding the ferromagnetic crystal grains. It further has an overcoating layer on the granular magnetic recording layer. The overcoating layer contains a nonmagnetic metal or a nonmagnetic alloy that can be diffused into the nonmagnetic grain boundary. The atoms coated on the granular magnetic recording layer diffuse into the nonmagnetic grain boundary even without being annealed, and promote to isolate the ferromagnetic crystal grains from each other. The overcoating can be removed after its formation to reduce the magnetic gap between the magnetic recording layer and the magnetic recording head.
摘要翻译：制造磁记录介质的方法包括具有铁磁晶粒和氧化物非磁性晶界或包围铁磁晶粒的氮化物非磁性晶界的粒状磁性层的磁记录层。在颗粒状磁记录层上还具有外涂层。外涂层包含可以扩散到非磁性晶界中的非磁性金属或非磁性合金。涂覆在颗粒状磁记录层上的原子即使没有退火也扩散到非磁性晶界，并促进铁磁晶粒彼此分离。在其形成之后可以去除外涂层以减小磁记录层和磁记录头之间的磁隙。

8. 发明申请

US20070082414A1 Perpendicular magnetic recording medium, method for production of the same, and magnetic recording apparatus 审中-公开
标题翻译：垂直磁记录介质，其制造方法和磁记录装置
公开(公告)号：US20070082414A1
公开(公告)日：2007-04-12
申请号：US10578681
申请日：2005-03-14
申请人： Sadayuki Watanabe , Yasushi Sakai
发明人： Sadayuki Watanabe , Yasushi Sakai
IPC分类号： H01L21/00
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/667 , G11B5/7379
摘要： A perpendicular magnetic recording medium having compatibility between low noises and high thermal stability is provided. In the present medium having at least an underlayer, a magnetic recording layer, a protective layer and a lubricant layer sequentially stacked on a nonmagnetic substrate, the underlayer is composed from at least one element selected from Ru, Rh, Os, Ir and Pt, the magnetic recording layer has a granular structure, and its composition is Co100-a-b-cPtaCrbBc)100-dMd (M is an oxide or a nitride of at least one element of Cr, Al, Ti, Si, Ta, Hf, Zr, Y and Ce, and a, b, c and d meet the condition of 0
摘要翻译：提供了具有低噪声和高热稳定性的兼容性的垂直磁记录介质。在至少具有下层，磁记录层，保护层和顺序层叠在非磁性基板上的润滑剂层的介质中，底层由选自Ru，Rh，Os，Ir和Pt中的至少一种元素构成，磁记录层具有颗粒状结构，其组成为100％以上的碳酸钡。（M是Cr，Al，Ti，Si，Ta，Hf，Zr，Y的至少一种元素的氧化物或氮化物）和Ce，a，b，c和d满足0

9. 发明申请

US20060154113A1 Perpendicular magnetic recording medium and magnetic recording device 审中-公开
公开(公告)号：US20060154113A1
公开(公告)日：2006-07-13
申请号：US11297792
申请日：2005-12-08
申请人： Sadayuki Watanabe , Yasushi Sakai
发明人： Sadayuki Watanabe , Yasushi Sakai
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/656 , G11B5/667 , G11B5/7325 , G11B5/7379
摘要： A perpendicular magnetic recording medium and a magnetic recording device with the medium are disclosed. Ferromagnetic crystal grains in a granular magnetic recording layer are grown with a constant grain diameter in a columnar shape, and the nonmagnetic grain boundaries comprise at least two types of oxides or nitrides, preferably of elements selected from Cr, Si, Al, Ti, Ta, Hf, Zr, Y, Ce, and B. The maximum G1 of absolute values of standard Gibbs free energy of formation for oxidation of ferromagnetic elements composing the ferromagnetic crystal grains, the minimum G2 and the second smallest G3 of absolute values of standard Gibbs free energy of formation per 1 mol of oxygen molecules for oxidation of elements composing the nonmagnetic grain boundaries satisfy inequalities G1 (G3−G2) and G3−G2 is preferably smaller than 200 kJ/mol. The oxides can be replaced by nitrides, in which case the maximum G11 of absolute values of standard Gibbs free energy of formation per one mole of nitrogen molecules in nitridation of ferromagnetic elements composing the ferromagnetic crystal grain, and the minimum G12 and the second smallest G13 of absolute values of standard Gibbs free energy of formation per one mole of nitrogen molecules in nitridation of elements composing the nonmagnetic grain boundary satisfy the following inequalities G11 (G13−G12), and G13−G12 is preferably smaller than 200 kJ/mol.

10. 发明申请

US20060014052A1 Perpendicular magnetic recording medium, method of manufacturing same, and magnetic recording device 有权
公开(公告)号：US20060014052A1
公开(公告)日：2006-01-19
申请号：US11174286
申请日：2005-07-01
申请人： Sadayuki Watanabe , Yasushi Sakai
发明人： Sadayuki Watanabe , Yasushi Sakai
IPC分类号： G11B5/708
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/85
摘要： A perpendicular medium is disclosed in which an isolation structure of an underlayer is formed using a simple method as in a conventional manufacturing process for a medium of continuous films. The method suppresses dispersion of alignment and reduced magnetic cluster size in a magnetic recording layer. The perpendicular medium exhibits high recording density owing to thin film thickness of the underlayer. A perpendicular magnetic recording medium includes at least an underlayer and a magnetic recording layer sequentially laminated on a nonmagnetic substrate. The underlayer consists of crystal grains and an amorphous grain boundary, and the crystal grain has a shape holding a relation (an area of a bottom region at an initial stage of growth)>(an area of a top region).

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