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1. 再颁专利

USRE41282E1 Perpendicular magnetic recording medium and a method of 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：USRE41282E1
公开(公告)日：2010-04-27
申请号：US11945854
申请日：2007-11-27
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
IPC分类号： G11B5/71 , G11B5/66 , C23C20/00
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/851
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译：垂直磁记录介质具有颗粒磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。即使在未预热基板的情况下也能获得良好的磁特性。因此，可以采用塑料树脂等非磁性基板来降低制造成本。

2. 发明授权

US06794028B2 Perpendicular magnetic recording medium and a method of 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：US06794028B2
公开(公告)日：2004-09-21
申请号：US10227621
申请日：2002-08-23
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
IPC分类号： G11B566
CPC分类号： G11B5/851 , G11B5/66 , Y10S428/90 , Y10T428/24975
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal closest-packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译：垂直磁记录介质具有颗粒状磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。即使在未预热基板的情况下也能获得良好的磁特性。因此，可以采用塑料树脂等非磁性基板来降低制造成本。

3. 发明授权

US08252152B2 Perpendicular magnetic recording medium and method of manufacturing the same and product thereof 有权
标题翻译：垂直磁记录介质及其制造方法及其制造方法
公开(公告)号：US08252152B2
公开(公告)日：2012-08-28
申请号：US12245317
申请日：2008-10-03
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
IPC分类号： C23C14/34
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851
摘要： The quantity of oxide contained in a magnetic layer is controlled to control the crystal grains and the segregation structure for ensuring low noise characteristic in a granular magnetic layer of a perpendicular magnetic recording medium. The granular magnetic layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary region mainly of an oxide surrounding the ferromagnetic crystal grains. The perpendicular magnetic recording medium has a nonmagnetic underlayer composed of a metal or alloy having hexagonal closest-packed crystal structure. The ferromagnetic crystal grain is composed of an alloy containing at least cobalt and platinum. The volume proportion of the nonmagnetic grain boundary region mainly of the oxide falls within a range of 15% to 40% of the volume of the total magnetic layer.
摘要翻译：控制包含在磁性层中的氧化物的量以控制晶粒和隔离结构，以确保垂直磁记录介质的粒状磁性层中的低噪声特性。粒状磁性层由铁磁晶粒和主要由铁磁晶粒周围的氧化物构成的非磁性晶界区域构成。垂直磁记录介质具有由具有六方最密堆积晶体结构的金属或合金构成的非磁性底层。铁磁晶粒由至少含有钴和铂的合金构成。主要是氧化物的非磁性晶界区域的体积比例落在总磁性层的体积的15〜40％的范围内。

4. 发明授权

US07147942B2 Perpendicular magnetic recording medium and method of manufacturing the same and product thereof 有权
公开(公告)号：US07147942B2
公开(公告)日：2006-12-12
申请号：US10314907
申请日：2002-12-09
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851
摘要： The quantity of oxide contained in a magnetic layer is controlled to control the crystal grains and the segregation structure for ensuring low noise characteristic in a granular magnetic layer of a perpendicular magnetic recording medium. The granular magnetic layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary region mainly of an oxide surrounding the ferromagnetic crystal grains. The perpendicular magnetic recording medium has a nonmagnetic underlayer composed of a metal or alloy having hexagonal closest-packed crystal structure. The ferromagnetic crystal grain is composed of an alloy containing at least cobalt and platinum. The volume proportion of the nonmagnetic grain boundary region mainly of the oxide falls within a range of 15% to 40% of the volume of the total magnetic layer.

5. 发明授权

US07067206B2 Perpendicular magnetic recording medium and a method of 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：US07067206B2
公开(公告)日：2006-06-27
申请号：US10227622
申请日：2002-08-23
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
IPC分类号： G11B5/66 , G11B5/76
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/851
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译：垂直磁记录介质具有颗粒磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。即使在未预热基板的情况下也能获得良好的磁特性。因此，可以采用塑料树脂等非磁性基板来降低制造成本。

6. 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.

7. 发明授权

US08105707B2 Perpendicular magnetic recording medium 有权
标题翻译：垂直磁记录介质
公开(公告)号：US08105707B2
公开(公告)日：2012-01-31
申请号：US12595618
申请日：2008-04-11
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Shunji Takenoiri
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Shunji Takenoiri
IPC分类号： G11B5/66
CPC分类号： G11B5/7325 , G11B5/65
摘要： A perpendicular magnetic recording medium, which includes a nonmagnetic substrate, and a soft magnetic layer, a first orientation control layer, a nonmagnetic intermediate layer, and a perpendicular magnetic recording layer formed sequentially on the nonmagnetic substrate. The perpendicular magnetic recording medium further includes a second orientation control layer provided between the first orientation control layer and the nonmagnetic intermediate layer. The nonmagnetic intermediate layer has hexagonal close-packed (hcp) structure. The first orientation control layer has a face-centered cubic (fcc) structure. The second orientation control layer includes Co and Cr, and has the hcp structure.
摘要翻译：包括非磁性基板的垂直磁记录介质和顺序地形成在非磁性基板上的软磁性层，第一取向控制层，非磁性中间层和垂直磁记录层。垂直磁记录介质还包括设置在第一取向控制层和非磁性中间层之间的第二取向控制层。非磁性中间层具有六方密堆积（hcp）结构。第一取向控制层具有面心立方（fcc）结构。第二取向控制层包括Co和Cr，具有hcp结构。

8. 发明授权

US07311983B2 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：US07311983B2
公开(公告)日：2007-12-25
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： G11B5/66
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。

9. 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。

10. 发明授权

US06667117B2 Perpendicular magnetic recording medium and a manufacturing method for 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：US06667117B2
公开(公告)日：2003-12-23
申请号：US09802176
申请日：2001-03-08
申请人： Hiroyuki Uwazumi , Yasushi Sakai , Toyoji Ataka
发明人： Hiroyuki Uwazumi , Yasushi Sakai , Toyoji Ataka
IPC分类号： G11B5667
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12861
摘要： A perpendicular magnetic recording medium is formed of a soft magnetic layer, an anti-ferromagnetic layer, a magnetic recording layer, a protective layer, and a liquid lubricant layer deposited in that order on a non-magnetic substrate. The anti-ferromagnetic layer is a Mn alloy containing at least Co at 10 atomic % or greater and 50 atomic % or less or a Mn alloy containing at least Ir at 10 atomic % or greater and 30 atomic % or less. A radial magnetic field is applied during formation of the anti-ferromagnetic layer and the soft magnetic layer. Exchange coupling with the anti-ferromagnetic layer controls magnetic domain walls of the soft magnetic layer. The need for heat treatment after film formation is eliminated.
摘要翻译：垂直磁记录介质由在非磁性基板上依次沉积的软磁性层，抗铁磁层，磁记录层，保护层和液体润滑剂层形成。反铁磁层是至少含有10原子％以上且50原子％以下的Co的Mn合金或至少含有10原子％以上且30原子％以下的Ir的Mn合金。在形成反铁磁层和软磁层期间施加径向磁场。与反铁磁层的交换耦合控制软磁层的磁畴壁。消除了成膜后对热处理的需要。

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