公开(公告)号：US20120307398A1

公开(公告)日：2012-12-06

申请号：US13577085

申请日：2011-02-03

申请人： Tetsuya Kanbe ,  Atsushi Hashimoto ,  Takayuki Fukushima

发明人： Tetsuya Kanbe ,  Atsushi Hashimoto ,  Takayuki Fukushima

IPC分类号： G11B21/02 ,  G11B5/706

CPC分类号： G11B5/7325 ,  G11B5/314 ,  G11B5/65 ,  G11B2005/0005 ,  G11B2005/0021

摘要： Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one oxide selected from SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO and ZnO. The thermally assisted magnetic recording medium has a magnetic layer comprised of fine magnetic crystal grains, exhibiting a sufficiently weak exchange coupling between magnetic grains, and having a minimized coercive force dispersion.

摘要翻译： 公开了一种热辅助磁记录介质，其包括基板，形成在基板上的多个底层，以及形成在底层上的主要由具有L10结构的合金组成的磁性层，其特征在于，至少一个 底层主要由MgO组成，并且包括选自SiO 2，TiO 2，Cr 2 O 3，Al 2 O 3，Ta 2 O 5，ZrO 2，Y 2 O 3，CeO 2，MnO，TiO和ZnO中的至少一种氧化物。 热辅助磁记录介质具有由精细的磁性晶粒组成的磁性层，在磁性颗粒之间呈现足够弱的交换耦合，并具有最小的矫顽力分散。

公开(公告)号：US20100182714A1

公开(公告)日：2010-07-22

申请号：US12627719

申请日：2009-11-30

申请人： Tetsuya KANBE ,  Yuzo Sasaki ,  Atsushi Hashimoto

发明人： Tetsuya KANBE ,  Yuzo Sasaki ,  Atsushi Hashimoto

IPC分类号： G11B5/02 ,  G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/82 ,  G11B2005/0021

摘要： A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.

摘要翻译： 提供能够实现1Tbit / inch2的表面记录密度的热辅助磁记录介质。 热辅助磁记录介质包括：基板; 形成在所述基板上的多个下层; 形成在下层上的第一磁性层; 形成在第一磁性层上并由铁磁性合金形成的耦合控制层; 以及形成在耦合控制层上的第二磁性层。 这里，第一磁性层和第二磁性层的居里温度高于耦合控制层的居里温度，第一磁性层的各向异性磁场大于第二磁性层的各向异性磁场， 饱和磁场在350℃以下的温度下具有最小值。

公开(公告)号：US07517597B2

公开(公告)日：2009-04-14

申请号：US11012387

申请日：2004-12-14

申请人： Tatsuya Hinoue ,  Hiroyuki Suzuki ,  Tetsuya Kanbe ,  Koji Sakamoto

发明人： Tatsuya Hinoue ,  Hiroyuki Suzuki ,  Tetsuya Kanbe ,  Koji Sakamoto

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/66

摘要： Embodiments of the present invention provide a magnetic recording medium for use in high-reliable magnetic recording apparatus capable of reading/writing information with high density. In one embodiment, a magnetic recording apparatus includes a magnetic recording medium, a driver for driving the medium in a recording direction, a compound type magnetic head having an electromagnetic induction type magnetic head for recording and a spin-valve type magnetic head for reading in combination, a mechanism to move the head relative to the medium, and a read/write signal processing module for the head. The magnetic recording medium has a magnetic layer formed by way of a first underlayer, a second underlayer and a third underlayer on a substrate. The first underlayer comprises an alloy of an amorphous structure, the second underlayer comprises a W element or a W-containing alloy layer, the third underlayer comprises one or more Cr-based alloy layers of a body-centered cubic structure, and the magnetic layer comprises one or more Co-based alloy layers of a hexagonal close-packed structure.

摘要翻译： 本发明的实施例提供一种用于能够以高密度读取/写入信息的高可靠性磁记录装置的磁记录介质。 在一个实施例中，磁记录装置包括磁记录介质，用于在记录方向上驱动介质的驱动器，具有用于记录的电磁感应型磁头的复合型磁头和用于读取的旋转型磁头 组合，相对于介质移动头的机构，以及用于头部的读/写信号处理模块。 磁记录介质具有通过第一底层，第二底层和第三底层在基底上形成的磁性层。 第一底层包括非晶结构的合金，第二底层包括W元素或含W合金层，第三底层包括一个或多个体心立方结构的Cr基合金层，并且磁性层 包括一个或多个六方密堆积结构的Co基合金层。

公开(公告)号：US06924048B2

公开(公告)日：2005-08-02

申请号：US10413481

申请日：2003-04-15

申请人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

发明人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/70 ,  G11B5/714 ,  G11B5/738

CPC分类号： G11B5/70 ,  G11B5/714 ,  Y10S428/90

摘要： A magnetic storage device has a magnetic layer, the magnetic crystal grains of which are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface or the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force, which is measured in the circumferential direction, to the coercive force, which is measured in the radial direction, (the orientation ratio of the coercive force), is larger than 1.0, but preferably nor greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.

摘要翻译： 磁存储装置具有磁性层，其磁性晶粒由非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 磁性晶粒的与表面或膜垂直的方向的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与径向测定的矫顽力（矫顽力的取向比）的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

公开(公告)号：US20050142389A1

公开(公告)日：2005-06-30

申请号：US11012387

申请日：2004-12-14

申请人： Tatsuya Hinoue ,  Hiroyuki Suzuki ,  Tetsuya Kanbe ,  Koji Sakamoto

发明人： Tatsuya Hinoue ,  Hiroyuki Suzuki ,  Tetsuya Kanbe ,  Koji Sakamoto

IPC分类号： G11B5/738 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/66

摘要： Embodiments of the present invention provide a magnetic recording medium for use in high-reliable magnetic recording apparatus capable of reading/writing information with high density. In one embodiment, a magnetic recording apparatus includes a magnetic recording medium, a driver for driving the medium in a recording direction, a compound type magnetic head having an electromagnetic induction type magnetic head for recording and a spin-valve type magnetic head for reading in combination, a mechanism to move the head relative to the medium, and a read/write signal processing module for the head. The magnetic recording medium has a magnetic layer formed by way of a first underlayer, a second underlayer and a third underlayer on a substrate. The first underlayer comprises an alloy of an amorphous structure, the second underlayer comprises a W element or a W-containing alloy layer, the third underlayer comprises one or more Cr-based alloy layers of a body-centered cubic structure, and the magnetic layer comprises one or more Co-based alloy layers of a hexagonal close-packed structure.

摘要翻译： 本发明的实施例提供一种用于能够以高密度读取/写入信息的高可靠性磁记录装置的磁记录介质。 在一个实施例中，磁记录装置包括磁记录介质，用于在记录方向上驱动介质的驱动器，具有用于记录的电磁感应型磁头的复合型磁头和用于读取的自旋阀型磁头 组合，相对于介质移动头的机构，以及用于头部的读/写信号处理模块。 磁记录介质具有通过第一底层，第二底层和第三底层在基底上形成的磁性层。 第一底层包括非晶结构的合金，第二底层包括W元素或含W合金层，第三底层包括一个或多个体心立方结构的Cr基合金层，并且磁性层 包括一个或多个六方密堆积结构的Co基合金层。

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.

公开(公告)号：US06569545B1

公开(公告)日：2003-05-27

申请号：US09343721

申请日：1999-06-30

申请人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

发明人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

IPC分类号： G11B566

CPC分类号： G11B5/70 ,  G11B5/714 ,  Y10S428/90

摘要： A magnetic storage device has a recording density of over 5 gigabits per square inch. In the magnetic layer, the magnetic crystal grains of the granular structure are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface of the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force which is measured in the circumferential direction to the coercive force which is measured in the radial direction, which is the orientation ratio of the coercive force, is larger than 1.0, but preferably not greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.

摘要翻译： 磁存储装置具有超过5千兆比特每平方英寸的记录密度。 在磁性层中，粒状结构的磁性晶粒被非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 在与膜表面垂直的方向上的磁性晶粒的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与作为矫顽力的取向比的径向测定的矫顽力的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

公开(公告)号：US06403242B1

公开(公告)日：2002-06-11

申请号：US09524914

申请日：2000-03-14

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.

公开(公告)号：US5922456A

公开(公告)日：1999-07-13

申请号：US922277

申请日：1997-09-03

申请人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto

发明人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto

IPC分类号： G11B5/66 ,  G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  G11B5/7325 ,  G11B2005/3996 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A longitudinal magnetic recording medium and a magnetic storage apparatus using the longitudinal magnetic recording medium. The recording medium has a multi-layered underlayer and a magnetic layer formed on it. The underlayer has a first layer of a body-centered cubic structure, a second layer of a hexagonal-close packed structure formed on the first layer, and a third layer of a bcc structure formed on the second layer. The underlayer may further have a fourth layer of an hcp structure layer formed on the third layer.

摘要翻译： 纵向磁记录介质和使用纵向磁记录介质的磁存储装置。 记录介质具有形成在其上的多层底层和磁性层。 底层具有体心立方结构的第一层，形成在第一层上的六方密堆积结构的第二层和形成在第二层上的bcc结构的第三层。 底层可以进一步具有形成在第三层上的第四层hcp结构层。

公开(公告)号：US08542569B2

公开(公告)日：2013-09-24

申请号：US13396234

申请日：2012-02-14

申请人： Tetsuya Kanbe ,  Kazuya Niwa ,  Katsuya Hara

发明人： Tetsuya Kanbe ,  Kazuya Niwa ,  Katsuya Hara

IPC分类号： G11B3/70

CPC分类号： G11B5/7325 ,  G11B5/65 ,  G11B2005/0021

摘要： A heat-assisted magnetic recording medium includes a substrate, a plurality of foundation layers, and a magnetic layer. The plurality of foundation layers are provided on the substrate and include a first layer containing MnO. The magnetic layer is provided on the plurality of layers and includes an alloy as a main ingredient. The alloy has an L10 structure.

摘要翻译： 热辅助磁记录介质包括基板，多个基础层和磁性层。 多个基础层设置在基底上并且包括含有MnO的第一层。 磁性层设置在多个层上，并且包括合金作为主要成分。 该合金具有L10结构。