公开(公告)号：US07687158B2

公开(公告)日：2010-03-30

申请号：US11666309

申请日：2005-10-28

申请人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

发明人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

IPC分类号： G11B5/66

CPC分类号： G11B5/732

摘要： The invention provides a perpendicular magnetic recording medium in which the recording density is greatly increased with little deviation of the crystal structure. A perpendicular magnetic recording medium has at least a soft magnetic under layer, an orientation control layer, a perpendicular magnetic layer, and a protective layer, which are formed on a nonmagnetic substrate, the orientation control layer consisting of a plurality of layers including a seed layer and an intermediate layer from the substrate side. Preferably, the seed layer and the intermediate layer each have a hexagonal close-packed (hcp) structure, and the average grain size of the seed layer is between 8 nm and 20 nm. The main component of the seed layer is preferably Mg, and the main component of the intermediate layer is preferably Ru.

摘要翻译： 本发明提供了一种垂直磁记录介质，其中记录密度大大增加，晶体结构几乎没有偏差。 垂直磁记录介质至少形成在非磁性基板上的软磁下层，取向控制层，垂直磁性层和保护层，所述取向控制层由包括种子的多个层 层和中间层。 优选地，种子层和中间层各自具有六方密堆积（hcp）结构，种子层的平均晶粒尺寸在8nm和20nm之间。 种子层的主要成分优选为Mg，中间层的主要成分优选为Ru。

公开(公告)号：US20090231755A1

公开(公告)日：2009-09-17

申请号：US11917088

申请日：2006-06-09

申请人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

发明人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

IPC分类号： G11B5/127 ,  G11B5/66

CPC分类号： H01F10/3227 ,  G11B5/65 ,  G11B5/66 ,  G11B5/855 ,  H01F10/007 ,  H01F10/16 ,  H01F10/3286

摘要： The invention provides a magnetic recording medium, and a magnetic recording and reproducing apparatus. The magnetic recording medium includes a substrate 11, an under layer 12 formed on the substrate 11, a magnetic recording layer 13 formed on the under layer 12, and a protective layer 14 formed on the magnetic recording layer 13. The magnetic recording layer 13 is composed of a primary recording layer 14 and a secondary recording layer 15 which are mutually exchange-coupled. The primary recording layer 14 has magnetic grains and a nonmagnetic material that surrounds the magnetic grains, and has a perpendicular magnetic anisotropy. The secondary recording layer 15 is made of a material having a negative crystal magnetic anisotropy and its easy plane of the magnetization is a plane of the medium.

摘要翻译： 本发明提供一种磁记录介质和磁记录和重放装置。 磁记录介质包括基板11，形成在基板11上的底层12，形成在下层12上的磁记录层13和形成在磁记录层13上的保护层14。磁记录层13 由相互交换耦合的主记录层14和辅助记录层15组成。 主记录层14具有磁性粒子和围绕磁性粒子的非磁性材料，并且具有垂直的磁各向异性。 辅助记录层15由具有负晶体磁各向异性的材料制成，其易磁化平面是介质的平面。

公开(公告)号：US20080118781A1

公开(公告)日：2008-05-22

申请号：US11795326

申请日：2006-01-31

申请人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

发明人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

IPC分类号： G11B5/667 ,  G11B5/738 ,  G11B5/82 ,  G11B5/84 ,  G11B5/852 ,  H01F10/26

CPC分类号： G11B5/1278 ,  G11B5/667 ,  G11B5/8404 ,  H01F10/30 ,  H01F10/3286

摘要： Perpendicular magnetic recording media enabling high-density recording and reproduction of information, as well as a production process thereof, and a magnetic recording and reproducing apparatus, are provided. Perpendicular magnetic recording media, having at least a soft magnetic underlayer and perpendicular magnetic recording layer on a disc-shaped nonmagnetic substrate, in which the soft magnetic underlayer has at least two soft magnetic layers, and Ru or Re between the two soft magnetic layers, are provided; the easy axis of magnetization of the soft magnetic underlayer has a desired direction; the easy axis of magnetization of the soft magnetic underlayer is substantially distributed in a direction except a radial direction of the nonmagnetic substrate, and, the bias magnetic field of the antiferromagnetic coupling in the direction of the easy axis of magnetization of the soft magnetic underlayer is 10 Oersteds (790 A/m) or greater.

摘要翻译： 提供了能够进行信息的高密度记录和再现的垂直磁记录介质及其制造过程以及磁记录和再现装置。 垂直磁记录介质，其中软磁性底层具有至少两个软磁性层，以及两个软磁性层之间的Ru或Re，在至少具有软磁性底层和垂直磁记录层的盘形非磁性基板上， 被提供; 软磁性底层的易磁化轴具有期望的方向; 软磁性底层的易磁化轴基本上分布在除非磁性基板的径向以外的方向上，软磁性底层的易磁化轴方向的反铁磁耦合的偏置磁场为 10奥斯特（790 A / m）或更高。

公开(公告)号：US06878459B2

公开(公告)日：2005-04-12

申请号：US10026709

申请日：2001-12-27

申请人： Migaku Takahashi ,  David Djayaprawira ,  Kazuya Komiyama ,  Satoru Yoshimura

发明人： Migaku Takahashi ,  David Djayaprawira ,  Kazuya Komiyama ,  Satoru Yoshimura

IPC分类号： C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  G11B5/851 ,  G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10T428/12639 ,  Y10T428/12833 ,  Y10T428/12847 ,  Y10T428/12861 ,  Y10T428/12986 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31

摘要： A magnetic recording medium was a high normalized coercive force and superior thermal stability. The magnetic recording medium comprises a non-magnetic base material, and a ferromagnetic metal layer of cobalt based alloy formed on top of this base material with a metal underlayer disposed therebetween, and displays a coercive force Hc of at least 2000 (Oe) and an anisotropic magnetic field Hkgrain of at least 10,000 (Oe). Furthermore, magnetic recording media in which the aforementioned metal underlayer and/or the ferromagnetic metal layer are fabricated in a film fabrication chamber with an ultimate vacuum at the 10−9 Torr level are preferred. A magnetic recording medium according to the present invention can be ideally applied to hard disks, floppy disks, and magnetic tapes and the like.

摘要翻译： 磁记录介质是高归一化矫顽力和优异的热稳定性。 磁记录介质包括非磁性基材，以及形成在该基材顶部上的钴基合金的强磁性金属层，其间设置有金属底层，并显示出至少2000（Oe）的矫顽力Hc和 至少10,000（Oe）的各向异性磁场Hk <颗粒>。 此外，优选在具有10 -9乇级别的极限真空的膜制造室中制造上述金属底层和/或强磁性金属层的磁记录介质。 根据本发明的磁记录介质可以理想地应用于硬盘，软盘和磁带等。

公开(公告)号：US06749956B1

公开(公告)日：2004-06-15

申请号：US09402017

申请日：1999-11-26

申请人： Migaku Takahashi ,  Akira Kikuchi

发明人： Migaku Takahashi ,  Akira Kikuchi

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/64 ,  G11B5/656 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording medium having a high normalized coercive force of a ferromagnetic metal layer and excellent S/N ration and adaptable to high density recording. The magnetic recording medium comprises a substrate body and a Co-based ferromagnetic metal layer formed thereon via a metallic underlying layer. The oxygen concentrations in the metallic underlying layer and in the ferromagnetic metal layer are not larger that 100 wt ppm. Magnetic in version is used for the recording. The value of 4ΠMs/Hkgrain is the saturation magnetization of the ferromagnetic metal layer and Hkgrain is the anisotropic magnetic field of the individual crystalline particles constituting the ferromagnetic metal layer is 1 or less.

摘要翻译： 具有强磁性金属层的高归一化矫顽力的磁记录介质，并且具有优异的S / N比，并适用于高密度记录。 磁记录介质包括经由金属底层在其上形成的基底主体和Co基强磁性金属层。 金属底层和强磁性金属层中的氧浓度不大于100重量ppm。 磁性版本用于录制。 4PiMs / Hk 的值是铁磁性金属层的饱和磁化强度，构成铁磁性金属层的各结晶粒子的各向异性磁场为1以下。

公开(公告)号：US06190763B1

公开(公告)日：2001-02-20

申请号：US08793871

申请日：1997-04-15

申请人： Migaku Takahashi

发明人： Migaku Takahashi

IPC分类号： G11B566

CPC分类号： G11B11/10586 ,  G11B11/10582 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： This invention aims at providing magnetooptic thin film having a high Kerr rotation angle (&thgr;k) in a short wave band, etc., magnetooptic recording medium and a method of providing them. The magnetooptic thin film has an alloy composition is MnxSbyPtz, 45≦x≦56, 40≦y≦48, 2≦z≦15 and x+y+z=100 (where x, y and z are proportions in atomic %), and a ratio &agr;/&bgr; of a diffraction intensity from a (220)-plane of a C1b type crystalline structure of the magnetooptic thin film in X-ray diffraction intensity &bgr; from a (110)-plane of a B81 type crystalline structure in from 0.05 to 1.0. The film thickness of the magnetooptic thin film is from 10 nm to 300 nm. The production method of the magnetooptic thin film is characterized in that the substrate, on which the magnetooptic thin film is to be formed, is heat-treated on a vacuum at most 5×10−6 Torr at a temperature not lower than 100° C. for at least 30 minutes before the thin film is formed.

摘要翻译： 本发明的目的在于提供一种在短波段等中具有高克耳旋转角（磁铁）的磁光薄膜，磁光记录介质及其提供方法。 磁光薄膜的合金组成为Mn x S比值，45 <= x <= 56，40 <= y = 48,2 x = z = 15，x + y + z = 100（其中x，y和z为 来自（110）面的X射线衍射强度β的来自磁光薄膜的C1b型晶体结构的（220）面的衍射强度的比例α/β B81型晶体结构为0.05〜1.0。 磁光薄膜的膜厚为10nm〜300nm。 磁光薄膜的制造方法的特征在于，要在其上形成磁光薄膜的基板在不低于100℃的温度下在最多5×10 -6乇的真空下进行热处理， 在薄膜形成之前至少30分钟。

公开(公告)号：US6042939A

公开(公告)日：2000-03-28

申请号：US913032

申请日：1997-10-20

申请人： Migaku Takahashi

发明人： Migaku Takahashi

IPC分类号： G11B5/64 ,  G11B5/73 ,  G11B5/84 ,  G11B5/851 ,  G11B5/66

CPC分类号： G11B5/7315 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/8404 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium having a large coercive force independent of the material of the substrate body by employing an .alpha.-rich layer and a .beta.-rich layer. The magnetic recording medium, using magnetic inversion, comprises a substrate body and a ferromagnetic Co-alloy layer on the surface of the substrate body. Between the substrate body and the magnetic layer may be interposed a Cr-containing metallic base layer. The base layer and/or the ferromagnetic alloy layer has an oxygen concentration of not more than 100 wt ppm. An .alpha.-rich layer of nickel, phosphorus, and the oxides thereof, and a .beta.-rich layer containing an ester group are provided between the substrate body and the base layer or the ferromagnetic alloy layer. In the manufacturing process according to the present invention, the .alpha.-rich layer, a .beta.-rich layer, metal base layer, and ferromagnetic metallic layer are formed at pressure below the order of 10.sup.-9 Torr.

摘要翻译： PCT No.PCT / JP95 / 00381 Sec。 371日期：1997年10月20日 102（e）日期1997年10月20日PCT 1995年3月8日PCT PCT。 公开号WO96 / 27878 日期1996年9月12日一种磁记录介质，通过采用富α层和富含β-的层，具有独立于基体的材料的矫顽力。 使用磁性反转的磁记录介质包括基板主体和在基板主体的表面上的铁磁Co合金层。 在基板主体和磁性层之间可以插入含Cr的金属基层。 基底层和/或铁磁性合金层的氧浓度不大于100重量ppm。 在基体和基底层或铁磁性合金层之间设置镍，磷及其氧化物的富Al层，含有酯基的富含β-的层。 在根据本发明的制造方法中，在10 -9乇以下的压力下形成富Al层，富含β-的层，金属基层和强磁性金属层。

公开(公告)号：US20140085023A1

公开(公告)日：2014-03-27

申请号：US14113711

申请日：2012-04-26

申请人： Migaku Takahashi ,  Tomoyuki Ogawa ,  Yasunobu Ogata ,  Naoya Kobayashi ,  Chammika Ruwan Polwatta Gallage ,  Kaori Kohara

发明人： Migaku Takahashi ,  Tomoyuki Ogawa ,  Yasunobu Ogata ,  Naoya Kobayashi ,  Chammika Ruwan Polwatta Gallage ,  Kaori Kohara

IPC分类号： H01F1/01 ,  H01F41/02

CPC分类号： H01F1/01 ,  B22F9/22 ,  C01B21/0622 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2006/12 ,  C01P2006/42 ,  C22C38/001 ,  C22C2202/02 ,  H01F1/065 ,  H01F1/083 ,  H01F41/0266

摘要： The present invention relates to ferromagnetic particles capable of exhibiting a high purity and excellent magnetic properties from the industrial viewpoints and a process for producing the ferromagnetic particles, and also provides an anisotropic magnet, a bonded magnet and a compacted magnet which are obtained by using the ferromagnetic particles. The ferromagnetic particles comprising an Fe16N2 compound phase in an amount of not less than 80% as measured by Mössbauer spectrum and each having an outer shell in which FeO is present in the form of a layer having a thickness of not more than 5 nm according to the present invention can be produced by subjecting aggregated particles of an iron compound as a starting material whose primary particles have a ratio of [(average deviation of major axis lengths of particles)/(average major axis length of particles)] of not more than 50%, Uc of not more than 1.55, Cg of not less than 0.95, Cg2 of not less than 0.40, an average major axis length of 40 to 5000 nm, and an aspect ratio (major axis diameter/minor axis diameter) of 1 to 200, to dispersing treatment; then subjecting the iron compound particles passed through a mesh screen to reducing treatment at a temperature of 160 to 420° C.; and subjecting the resulting particles to nitridation treatment at a temperature of 130 to 170° C.

摘要翻译： 本发明涉及从工业观点出发具有高纯度和优异磁特性的铁磁性颗粒以及制造铁磁性颗粒的方法，并且还提供了各向异性磁体，粘结磁体和压实磁体，它们通过使用 铁磁颗粒。 铁磁性颗粒包含通过Mössbauer光谱测量的不小于80％的Fe 16 N 2化合物相，并且每个具有外壳，其中FeO以厚度不大于5nm的层的形式存在，根据 本发明可以通过使铁化合物的凝集颗粒作为起始材料，其一次颗粒具有[（颗粒的长轴长度的平均偏差）/（颗粒的平均长轴长度）]的比例不大于 50％，Uc为1.55以下，Cg为0.95以上，Cg2为0.40以上，平均长轴长为40〜5000nm，纵横比（长轴径/短轴直径）为1 至200，分散处理; 然后使经过筛网的铁化合物粒子在160〜420℃的温度下进行还原处理。 并在130-170℃的温度下对所得颗粒进行氮化处理。

公开(公告)号：US20120244356A1

公开(公告)日：2012-09-27

申请号：US13503215

申请日：2010-10-19

申请人： Migaku Takahashi ,  Tomoyuki Ogawa ,  Yasunobu Ogata ,  Naoya Kobayashi

发明人： Migaku Takahashi ,  Tomoyuki Ogawa ,  Yasunobu Ogata ,  Naoya Kobayashi

IPC分类号： H01F1/11 ,  B05D3/10 ,  C01B21/06 ,  H01F41/00 ,  B82Y40/00 ,  B82Y30/00

CPC分类号： H01F1/0533 ,  B82Y30/00 ,  C01B21/0622 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/42 ,  H01F1/06 ,  H01F1/061 ,  H01F1/08 ,  Y10T428/2982

摘要： The present invention relates to Fe16N2 particles in the form of a single phase which are obtained by subjecting iron oxide or iron oxyhydroxide whose surface may be coated with at least alumina or silica, if required, as a starting material, to reducing treatment and nitridation treatment, a process for producing the Fe16N2 particles in the form of a single phase for a heat treatment time of not more than 36 hr, and further relates to an anisotropic magnet or a bonded magnet which is obtained by magnetically orienting the Fe16N2 particles in the form of a single phase. The Fe16N2 particles according to the present invention can be produced in an industrial scale and have a large BHmax value.

摘要翻译： 本发明涉及单相形式的Fe16N2颗粒，其通过使表面可以至少涂覆氧化铝或二氧化硅的氧化铁或羟基氧化铁（如果需要）作为起始原料来进行还原处理和氮化处理而获得 制造热处理时间不超过36小时的单相形式的Fe 16 N 2颗粒的方法，还涉及通过磁性取向Fe16N2颗粒的形式获得的各向异性磁体或粘结磁体 的单相。 根据本发明的Fe 16 N 2颗粒可以以工业规模生产并具有大的BHmax值。

公开(公告)号：US07943248B2

公开(公告)日：2011-05-17

申请号：US11795326

申请日：2006-01-31

申请人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

发明人： Migaku Takahashi ,  Masahiro Oka ,  Akira Kikitsu

IPC分类号： G11B5/66

CPC分类号： G11B5/1278 ,  G11B5/667 ,  G11B5/8404 ,  H01F10/30 ,  H01F10/3286

摘要： Perpendicular magnetic recording media enabling high-density recording and reproduction of information, as well as a production process thereof, and a magnetic recording and reproducing apparatus, are provided. Perpendicular magnetic recording media, having at least a soft magnetic underlayer and perpendicular magnetic recording layer on a disc-shaped nonmagnetic substrate, in which the soft magnetic underlayer has at least two soft magnetic layers, and Ru or Re between the two soft magnetic layers, are provided; the easy axis of magnetization of the soft magnetic underlayer has a desired direction; the easy axis of magnetization of the soft magnetic underlayer is substantially distributed in a direction except a radial direction of the nonmagnetic substrate, and, the bias magnetic field of the antiferromagnetic coupling in the direction of the easy axis of magnetization of the soft magnetic underlayer is 10 Oersteds (790 A/m) or greater.

摘要翻译： 提供了能够进行信息的高密度记录和再现的垂直磁记录介质及其制造过程以及磁记录和再现装置。 垂直磁记录介质，其中软磁性底层具有至少两个软磁性层，以及两个软磁性层之间的Ru或Re，在至少具有软磁性底层和垂直磁记录层的盘形非磁性基板上， 被提供; 软磁性底层的易磁化轴具有期望的方向; 软磁性底层的易磁化轴基本上分布在除非磁性基板的径向以外的方向上，软磁性底层的易磁化轴方向的反铁磁耦合的偏置磁场为 10奥斯特（790 A / m）或更高。