公开(公告)号：US08705208B2

公开(公告)日：2014-04-22

申请号：US12828073

申请日：2010-06-30

申请人： Hiroyuki Nakagawa ,  Reiko Arai ,  Ichiro Tamai ,  Kiwamu Tanahashi

发明人： Hiroyuki Nakagawa ,  Reiko Arai ,  Ichiro Tamai ,  Kiwamu Tanahashi

IPC分类号： G11B5/82

CPC分类号： G11B5/66 ,  G11B5/1278 ,  G11B5/65

摘要： According to one embodiment, a PMRM includes a substrate, a soft magnetic underlayer above the substrate, an underlayer above the soft magnetic underlayer, an oxide-containing magnetic layer above the underlayer, and a ferromagnetic layer above the magnetic layer having no oxides. The underlayer controls orientation and segregation of the magnetic layer. The oxide-containing magnetic layer comprises at least two or more magnetic layers, a Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer is between about 23 at. % and about 32 at. %, and a difference between the Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer and a magnetic layer having a lowest Cr concentration among the at least three magnetic layers is less than about 25 at. %, the magnetic layer with a lowest Cr concentration has a granular structure, and a nucleation field is greater than about 159.2 kA/m.

摘要翻译： 根据一个实施例，PMRM包括衬底，衬底上方的软磁性底层，软磁性底层上方的底层，底层上方的含氧化物的磁性层以及不含氧化物的磁性层上方的铁磁性层。 底层控制磁性层的取向和偏析。 含氧化物的磁性层包括至少两个或更多个磁性层，与强磁性金属层相邻的磁性层的Cr浓度在约23at。 ％和约32英寸。 ％，并且与所述强磁性金属层相邻的磁性层的Cr浓度与所述至少三个磁性层中具有最低Cr浓度的磁性层之间的差异小于约25at。 ％，具有最低Cr浓度的磁性层具有粒状结构，并且成核场大于约159.2kA / m。

公开(公告)号：US20110002064A1

公开(公告)日：2011-01-06

申请号：US12828073

申请日：2010-06-30

申请人： Hiroyuki Nakagawa ,  Reiko Arai ,  Ichiro Tamai ,  Kiwamu Tanahashi

发明人： Hiroyuki Nakagawa ,  Reiko Arai ,  Ichiro Tamai ,  Kiwamu Tanahashi

IPC分类号： G11B21/02 ,  G11B5/33

CPC分类号： G11B5/66 ,  G11B5/1278 ,  G11B5/65

摘要： According to one embodiment, a PMRM includes a substrate, a soft magnetic underlayer above the substrate, an underlayer above the soft magnetic underlayer, an oxide-containing magnetic layer above the underlayer, and a ferromagnetic layer above the magnetic layer having no oxides. The underlayer controls orientation and segregation of the magnetic layer. The oxide-containing magnetic layer comprises at least two or more magnetic layers, a Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer is between about 23 at. % and about 32 at. %, and a difference between the Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer and a magnetic layer having a lowest Cr concentration among the at least three magnetic layers is less than about 25 at. %, the magnetic layer with a lowest Cr concentration has a granular structure, and a nucleation field is greater than about 159.2 kA/m.

摘要翻译： 根据一个实施例，PMRM包括衬底，衬底上方的软磁性底层，软磁性底层上方的底层，底层上方的含氧化物的磁性层以及不含氧化物的磁性层上方的铁磁性层。 底层控制磁性层的取向和偏析。 含氧化物的磁性层包括至少两个或更多个磁性层，与强磁性金属层相邻的磁性层的Cr浓度在约23at。 ％和约32英寸。 ％，并且与所述强磁性金属层相邻的磁性层的Cr浓度与所述至少三个磁性层中具有最低Cr浓度的磁性层之间的差异小于约25at。 ％，具有最低Cr浓度的磁性层具有粒状结构，并且成核场大于约159.2kA / m。

公开(公告)号：US09058831B2

公开(公告)日：2015-06-16

申请号：US13326213

申请日：2011-12-14

申请人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

发明人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

IPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/851

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/84 ,  G11B5/851

摘要： In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.

摘要翻译： 在一个实施例中，垂直磁记录介质包括氧化物记录层，该氧化物记录层包括不包含位于氧化物记录层上方的氧化物的氧化物和非氧化物记录层。 氧化物记录层包括区域R1，其中平行于R1的形成平面的方向上的晶界宽度从氧化物记录层的最下部朝向介质表面增加，位于R1上方的区域R3，其中晶界 宽度随着介质表面的增加而增加，其中R2的晶界宽度从R1向R3延伸的区域R2，R2位于R1和R3之间，R4的晶界宽度从R3向R3的边界宽度减小 中间表面，其中R4位于R3上方并且靠近氧化物记录层的最上部。

公开(公告)号：US20130155542A1

公开(公告)日：2013-06-20

申请号：US13326213

申请日：2011-12-14

申请人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

发明人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

IPC分类号： G11B21/02 ,  G11B5/851 ,  G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/84 ,  G11B5/851

摘要： In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.

摘要翻译： 在一个实施例中，垂直磁记录介质包括氧化物记录层，该氧化物记录层包括不包含位于氧化物记录层上方的氧化物的氧化物和非氧化物记录层。 氧化物记录层包括区域R1，其中平行于R1的形成平面的方向上的晶界宽度从氧化物记录层的最下部朝向介质表面增加，位于R1上方的区域R3，其中晶界 宽度随着介质表面的增加而增加，其中R2的晶界宽度从R1向R3延伸的区域R2，R2位于R1和R3之间，R4的晶界宽度从R3向R3的边界宽度减小 中间表面，其中R4位于R3上方并且靠近氧化物记录层的最上部。

公开(公告)号：US20120307395A1

公开(公告)日：2012-12-06

申请号：US13149780

申请日：2011-05-31

申请人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

发明人： Shun Tonooka ,  Kiwamu Tanahashi ,  Hiroyuki Nakagawa ,  Ichiro Tamai

IPC分类号： G11B21/02 ,  G11B5/667 ,  G11B5/66

CPC分类号： G11B5/66

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a first granular recording layer characterized by a magnetic anisotropy Ku1, a second granular recording layer above the first granular recording layer characterized by a magnetic anisotropy Ku2, and a third granular recording layer above the second granular recording layer characterized by a magnetic anisotropy Ku3, wherein Ku3 Ku1. In another embodiment, a magnetic medium includes a first recording layer with a first CoCrPt alloy in a first ratio X1, a second recording layer above the first recording layer and having a second CoCrPt alloy in a second ratio X2, and a third recording layer above the second recording layer having a third CoCrPt alloy in a third ratio X3 with each ratio defined as a concentration of Pt divided by a concentration of Cr in the respective CoCrPt alloy, wherein X3 X1.

摘要翻译： 根据一个实施例，垂直磁记录介质包括第一颗粒记录层，其特征在于磁各向异性Ku1，第一颗粒记录层之上的第二粒状记录层，其特征在于磁各向异性Ku2，第二颗粒记录层位于第二颗粒记录层上方 其特征在于磁各向异性Ku3的粒状记录层，其中Ku3 Ku1。 在另一个实施例中，磁介质包括具有第一比率X1的第一CoCrPt合金的第一记录层，第一记录层上方的第二记录层，并且具有第二比率X2的第二CoCrPt合金，以及第三记录层 所述第二记录层具有第三比例X3的第三CoCrPt合金，其中每个比例定义为各自的CoCrPt合金中的Pt的浓度除以Cr的浓度，其中X3 X1。

公开(公告)号：US08440332B2

公开(公告)日：2013-05-14

申请号：US12384850

申请日：2009-04-08

申请人： Ichiro Tamai ,  Kiwamu Tanahashi

发明人： Ichiro Tamai ,  Kiwamu Tanahashi

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65

摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium that reduces the noise of granular recording layers, obtains sufficient overwrite characteristic that suppresses an increase in the magnetic cluster size, and allows high-density recording. According to one embodiment, a perpendicular magnetic recording medium comprising substrate having thereon at least soft magnetic layer, nonmagnetic intermediate layer, a perpendicular recording layer and protective layer formed in that order. The perpendicular recording layer consists of three or more layers of first recording layer, a second recording layer, and a third recording layer from the side nearer to the substrate. The first recording layer and the second recording layer have a granular structure comprising a grain boundary of an oxide surrounding ferromagnetic crystal grains containing Co and Pt, and the third recording layer has a non-granular structure mainly comprising Co and not containing an oxide. The grain boundary of the first recording layer contains Si, Cr and oxygen, and at least one element selected from Ti, Ta and Nb, and the grain boundary of the second recording layer contains Cr and oxygen, or contains Cr and oxygen and at least one element selected from Si, W and V.

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.

公开(公告)号：US06574060B2

公开(公告)日：2003-06-03

申请号：US09799073

申请日：2001-03-06

申请人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

发明人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

IPC分类号： G11B502

CPC分类号： G11B5/7325 ,  C23C14/185 ,  G11B5/00 ,  G11B5/012 ,  G11B2005/001 ,  G11B2005/0016 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/1107 ,  Y10T428/1121 ,  Y10T428/12507 ,  Y10T428/1266 ,  Y10T428/12667 ,  Y10T428/12674 ,  Y10T428/12819 ,  Y10T428/12826 ,  Y10T428/12868 ,  Y10T428/12944 ,  Y10T428/265

摘要： In a magnetic storage apparatus having a magnetic recording medium, a drive unit for driving this medium in a prespecified recording direction, a magnetic head assembly including a recorder section and reproduction section, a way to cause the magnetic head to move relatively with respect to the magnetic record medium, and a record/playback signal processor for performing signal inputting to the magnetic head and for effecting reproduction of an output signal from the magnetic head, the reproduction section of said magnetic head is composed of a magnetic head of the magnetoresistance effect type, while said magnetic record medium is structured including a substrate and a magnetic layer formed thereover with one or several underlayers being sandwiched therebetween, wherein at least one of hte underlayers is a specific layer that is made of amorphous or microcrystalline materials containing therein Ni as the principal or main component thereof and further containing at least one kind of element as selected from the group consisting of Nb and Ta.

摘要翻译： 在具有磁记录介质的磁存储装置中，用于以预先指定的记录方向驱动该介质的驱动单元，包括记录器部分和再现部分的磁头组件，使磁头相对于 磁记录介质和记录/重放信号处理器，用于对磁头进行信号输入并用于实现来自磁头的输出信号的再现，所述磁头的再现部分由磁阻效应型磁头 而所述磁记录介质被构造成包括衬底和形成在其上的一个或多个底层之间的磁性层，其中至少一个底层是由非晶或微晶材料制成的特定层，其中含有Ni作为 其主要成分或主要成分，还含有至少一种e 选自Nb和Ta组成的组。

公开(公告)号：US07182974B2

公开(公告)日：2007-02-27

申请号：US10774371

申请日：2004-02-10

申请人： Yoshio Takahashi ,  Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai

发明人： Yoshio Takahashi ,  Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai

IPC分类号： B05D5/12

CPC分类号： G11B5/64 ,  G11B5/66 ,  G11B5/84 ,  Y10T428/12465 ,  Y10T428/12875 ,  Y10T428/31

摘要： A magnetic recording medium having a high coercive force and being capable of high-density writing/reading has a substrate, a soft magnetic layer, a non-magnetic intermediate layer, a magnetic layer, a protective layer, and a lubricating layer. The magnetic layer is characterized by stacking fault density and dispersion of particle diameters. The stacking fault density should preferably be no larger than 0.05, and the dispersion of particle diameters should preferably be no larger than 0.4. The magnetic recording medium has a coercive force larger than 4000 Oe, is highly stable to thermal decay, and has a recording density in excess of 50 Gbit/in2.

摘要翻译： 具有高矫顽磁力并且能够进行高密度写入/读取的磁记录介质具有基板，软磁层，非磁性中间层，磁性层，保护层和润滑层。 磁性层的特征在于堆垛层错密度和粒径分散。 堆垛层错密度优选为0.05以下，粒径分布优选为0.4以下。 磁记录介质具有大于4000Oe的矫顽力，对热衰减高度稳定，并且具有超过50Gbit / in 2的记录密度。

公开(公告)号：US6001447A

公开(公告)日：1999-12-14

申请号：US4318

申请日：1998-01-08

申请人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

发明人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16

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

摘要： The magnetic storage apparatus has a high reliability at a recording density of 2 gigabits or more per square inch. The longitudinal recording media necessary to realize the apparatus has a low media noise and is immune from the influence of thermal fluctuations. The magnetic storage apparatus has a longitudinal magnetic recording media including a magnetic layer which is formed on a substrate via a multi-layered underlayer; a driver for driving the recording media in a recording direction; a magnetic head including a recording section and a read-back section; a driver for moving the magnetic head relatively with respect to the longitudinal magnetic recording media; and a read/write signal processor for processing input signals to the magnetic head and output signal read-back therefrom. The read-back section of the magnetic head includes a magnetoresistive head. One layer of the multi-layered underlayer in the longitudinal magnetic recording media which is in contact with the magnetic layer has a substantially hexagonal close-packed (hcp) structure and has crystal grains whose c-axes are substantially parallel with the substrate plane.

摘要翻译： 磁记录装置在每平方英寸2吉比特或更高的记录密度下具有高可靠性。 实现该装置所需的纵向记录介质具有低介质噪声并且免受热波动的影响。 磁存储装置具有纵向磁记录介质，其包括通过多层底层形成在基板上的磁性层; 用于在记录方向上驱动记录介质的驱动器; 包括记录部分和回读部分的磁头; 用于相对于纵向磁记录介质移动磁头的驱动器; 以及用于处理对磁头的输入信号和从其读回的输出信号的读/写信号处理器。 磁头的回读部分包括磁阻头。 与磁性层接触的纵向磁记录介质中的多层底层的一层具有大致六边形密堆积（hcp）结构，并且具有c轴与基板平面基本平行的晶粒。