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1. 发明授权

US06197367B1 Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage 失效
标题翻译：磁记录介质，制造磁记录介质的方法和磁存储
公开(公告)号：US06197367B1
公开(公告)日：2001-03-06
申请号：US08960751
申请日：1997-10-29
申请人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
发明人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/8404 , Y10T428/1266 , Y10T428/12667
摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.
摘要翻译：一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。具有大量氧的簇分散在第一和第二底涂层的边界面上。优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能DELTAG°之间的差异大。

2. 发明授权

US06692843B2 Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage 失效
标题翻译：磁记录介质，制造磁记录介质的方法和磁存储
公开(公告)号：US06692843B2
公开(公告)日：2004-02-17
申请号：US09784078
申请日：2001-02-16
申请人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
发明人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
IPC分类号： G11B573
CPC分类号： G11B5/7325 , G11B5/8404 , Y10T428/1266 , Y10T428/12667
摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.
摘要翻译：一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。具有大量氧的簇分散在第一和第二底涂层的边界面上。优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能的差ΔG°大。

3. 发明授权

US06596420B2 Magnetic recording media and magnetic recording system using the same 失效
公开(公告)号：US06596420B2
公开(公告)日：2003-07-22
申请号：US10101946
申请日：2002-03-21
申请人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/012 , G11B5/39 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12847 , Y10T428/12854 , Y10T428/26
摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

4. 发明授权

US07056604B2 Magnetic recording media and magnetic recording system using the same 失效
公开(公告)号：US07056604B2
公开(公告)日：2006-06-06
申请号：US10452723
申请日：2003-06-03
申请人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/7325 , G11B5/012 , G11B5/39 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12847 , Y10T428/12854 , Y10T428/26
摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

5. 发明授权

US06403240B1 Magnetic recording media and magnetic recording system using the same 失效
公开(公告)号：US06403240B1
公开(公告)日：2002-06-11
申请号：US08849414
申请日：1997-05-19
申请人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
IPC分类号： B32B1504
CPC分类号： G11B5/7325 , G11B5/012 , G11B5/39 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12847 , Y10T428/12854 , Y10T428/26
摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

6. 发明授权

US6057021A Magnetic recording media and magnetic recording system using the same 失效
标题翻译：磁记录介质和使用磁记录系统的磁记录系统
公开(公告)号：US6057021A
公开(公告)日：2000-05-02
申请号：US944472
申请日：1997-10-06
申请人： Akira Ishikawa , Yuzuru Hosoe , Yoshihiro Shiroishi , Masatoshi Takeshita , Yotsuo Yahisa , Tomoo Yamamoto , Akira Osaki , Kiwamu Tanahashi , Jun Fumioka , Yoshiki Kato , Masaki Ohura , Yukio Katoh
发明人： Akira Ishikawa , Yuzuru Hosoe , Yoshihiro Shiroishi , Masatoshi Takeshita , Yotsuo Yahisa , Tomoo Yamamoto , Akira Osaki , Kiwamu Tanahashi , Jun Fumioka , Yoshiki Kato , Masaki Ohura , Yukio Katoh
IPC分类号： G11B5/64 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/60
CPC分类号： G11B5/7325 , G11B5/64 , G11B5/66 , G11B5/8404 , Y10S428/90 , Y10T428/24355 , Y10T428/265
摘要： In a magnetic recording medium having a non-magnetic disk substrate and a magnetic film formed on the surface of the non-magnetic disk substrate, a surface average roughness factor Ra(r) on the surface of the medium being from 0.3 nm to 3 nm, an orientation ratio of coercivity being from 0.1 to 0.7, and an in-plane magnetic anisotropic energy being from 3.times.10.sup.4 J/m.sup.3 to 5.times.10.sup.5 J/m.sup.3. By using such a medium, it is possible to provide a magnetic recording apparatus in which the magnetic head is capable of flying in a low position and high-density recording is achieved.
摘要翻译：在具有非磁盘基板和形成在非磁盘基板的表面上的磁性膜的磁记录介质中，介质表面的表面平均粗糙度Ra（r）为0.3nm〜3nm 矫顽力的取向比为0.1〜0.7，面内磁各向异性能为3×104J / m3〜5×105J / m3。通过使用这种介质，可以提供磁头能够在低位置飞行的磁记录装置，并且实现高密度记录。

7. 发明授权

US5750230A Magnetic recording media and magnetic recording system using the same 失效
标题翻译：磁记录介质和使用磁记录系统的磁记录系统
公开(公告)号：US5750230A
公开(公告)日：1998-05-12
申请号：US155515
申请日：1993-11-22
申请人： Akira Ishikawa , Yuzuru Hosoe , Yoshihiro Shiroishi , Masatoshi Takeshita , Yotsuo Yahisa , Tomoo Yamamoto , Akira Osaki , Kiwamu Tanahashi , Jun Fumioka , Yoshiki Kato , Masaki Ohura , Yukio Katoh
发明人： Akira Ishikawa , Yuzuru Hosoe , Yoshihiro Shiroishi , Masatoshi Takeshita , Yotsuo Yahisa , Tomoo Yamamoto , Akira Osaki , Kiwamu Tanahashi , Jun Fumioka , Yoshiki Kato , Masaki Ohura , Yukio Katoh
IPC分类号： G11B5/64 , G11B5/66 , G11B5/73 , G11B5/84
CPC分类号： G11B5/7325 , G11B5/64 , G11B5/66 , G11B5/8404 , Y10S428/90 , Y10T428/24355 , Y10T428/265
摘要： In a magnetic recording medium having a nonmagnetic disk substrate and a magnetic film formed on the surface of the non-magnetic disk substrate, a surface average roughness factor Ra(r) on the surface of the medium being from 0.3 nm to 3 nm, an orientation ratio of coercivity being from 0.1 to 0.7, and an in-plane magnetic anisotropic energy being from 3.times.10.sup.4 J/m.sup.3 to 5.times.10.sup.5 J/m.sup.3. By using such a medium, it is possible to provide a magnetic recording apparatus in which the magnetic head is capable of flying in a low position and high-density recording is achieved.
摘要翻译：在具有非磁性盘基片和形成在非磁盘基片的表面上的磁性膜的磁记录介质中，介质表面的表面平均粗糙系数Ra（r）为0.3nm至3nm，矫顽力取向比为0.1〜0.7，面内磁各向异性能为3×104J / m3〜5×105J / m3。通过使用这种介质，可以提供磁头能够在低位置飞行的磁记录装置，并且实现高密度记录。

8. 发明授权

US5723198A Multi-layered magnetic recording medium and magnetic recording system employing the same 失效
标题翻译：多层磁记录介质和采用该磁记录介质的磁记录系统
公开(公告)号：US5723198A
公开(公告)日：1998-03-03
申请号：US258923
申请日：1994-06-13
申请人： Yuzuru Hosoe , Yoshihiro Shiroishi , Akira Ishikawa , Futoshi Tomiyama , Kazuetsu Yoshida , Tomoo Yamamoto , Yotsuo Yahisa , Akira Osaki , Katsuo Abe , Shinji Narishige , Naoki Kodama , Kiwamu Tanahashi , Emi Mangyo
发明人： Yuzuru Hosoe , Yoshihiro Shiroishi , Akira Ishikawa , Futoshi Tomiyama , Kazuetsu Yoshida , Tomoo Yamamoto , Yotsuo Yahisa , Akira Osaki , Katsuo Abe , Shinji Narishige , Naoki Kodama , Kiwamu Tanahashi , Emi Mangyo
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , Y10S428/90 , Y10T428/24355 , Y10T428/24942 , Y10T428/265
摘要： In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.
摘要翻译：在包括磁记录介质的磁记录系统中，用于驱动这些磁记录介质的旋转驱动单元，读/写磁头，用于驱动这些读/写磁头的驱动装置以及读/写信号处理装置，读/ 相应的磁头由磁阻头安排。磁记录介质由具有直接制造的多个磁性层或通过非磁盘基板上的底层以及布置在这些非磁性层之间的非磁性中间层的多层磁性介质构成。此外，通过沿着磁记录介质的圆周方向施加磁场来测量的一个矫顽力被选择为大于通过沿着磁记录介质的径向方向施加磁场而测量的其他矫顽力，因此，与常规磁记录系统相比，实现了更高的信噪比。由于非磁性中间层的厚度小于或等于5nm，并且总层小于或等于5nm，并且多个磁性层的总层数也被选择为奇数，可以实现更好的特性。因此，由于MTBF（平均故障间隔时间）长于或等于0.15万小时，具有高记录密度，并且盘基板和磁头滑块可以以高封装密度安装，紧凑且高容量的磁记录系统可以得到。

9. 发明授权

US5815343A Magnetic recording medium, process for producing the same and magnetic recording system 失效
标题翻译：磁记录介质，制造过程及磁记录系统
公开(公告)号：US5815343A
公开(公告)日：1998-09-29
申请号：US967346
申请日：1997-10-27
申请人： Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
发明人： Akira Ishikawa , Yoshihiro Shiroishi , Yuzuru Hosoe , Yotsuo Yahisa , Tomoo Yamamoto , Masukazu Igarashi , Akira Osaki , Yoshiki Kato , Jun Fumioka
IPC分类号： G11B5/012 , G11B5/39 , G11B5/62 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/78 , G11B5/82 , G11B17/00
CPC分类号： G11B5/012 , G11B5/39 , G11B5/64 , G11B5/656 , G11B5/66 , G11B5/7315 , G11B5/7325 , G11B5/8404
摘要： A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.
摘要翻译：磁记录介质包括非磁性衬底和设置在非磁性衬底上的磁性层。在记录方向上确定的磁性层的剩余磁通密度Br1和磁性层的厚度δ的乘积Br1δ的值不小于5Gm且不大于180Gm; 在平行于基板平面并垂直于记录方向Br1 / Br2的方向上确定的Br1与剩余通量密度Br2的比值不小于1.3且不大于3; 非磁性基板的表面具有主要在记录方向上延伸的织构槽; 并且在垂直于基板平面并垂直于记录方向的方向上确定的磁性层的表面的平均粗糙度Ra不小于0.3nm且不大于1.9nm。或者，在记录方向上确定的磁性层的剩余磁通密度Br和磁性层的厚度δ的乘积Br delta的值不小于5Gm且不大于80Gm; 并且磁记录介质的各向异性磁场Hk的值不小于7kOe且不大于20kOe。

10. 发明授权

US06605374B2 Magnetic recording medium and magnetic recording system using such a magnetic recording medium 失效
公开(公告)号：US06605374B2
公开(公告)日：2003-08-12
申请号：US10137398
申请日：2002-05-03
申请人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
IPC分类号： G11B566
CPC分类号： G11B5/65 , G11B5/64 , G11B5/653 , Y10S428/90 , Y10T428/12465 , Y10T428/12854 , Y10T428/26 , Y10T428/265
摘要： The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku·v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

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