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：US20120044595A1

公开(公告)日：2012-02-23

申请号：US12861725

申请日：2010-08-23

申请人： Yotsuo Yahisa ,  Ichiro Tamai ,  Akemi Hirotsune

发明人： Yotsuo Yahisa ,  Ichiro Tamai ,  Akemi Hirotsune

IPC分类号： G11B21/02 ,  G11B5/66

CPC分类号： G11B5/7325

摘要： In one embodiment, a perpendicular magnetic recording medium (PMRM) includes a first interlayer comprising Ru or a Ru alloy, a second interlayer above the first interlayer comprising Ru or a Ru alloy, and a third interlayer formed between the first interlayer and the second interlayer that reduces an average cluster size of the second interlayer. In another embodiment, a PMRM includes a first interlayer comprising Ru or a Ru alloy, a second interlayer above the first interlayer comprising Ru or a Ru alloy, and a third interlayer formed between the first interlayer and the second interlayer that reduces an average cluster size of the second interlayer. The third interlayer has a thickness of between about 1.0 nm and about 3.0 nm and has a structure selected from a group consisting of: BCC, B2, C11b, L21, and D03. Other PMRMs and methods of fabrication are presented as well.

摘要翻译： 在一个实施方案中，垂直磁记录介质（PMRM）包括包含Ru或Ru合金的第一中间层，包含Ru或Ru合金的第一中间层上的第二中间层，以及在第一中间层和第二中间层之间形成的第三中间层 这降低了第二夹层的平均簇尺寸。 在另一个实施方案中，PMRM包括包含Ru或Ru合金的第一中间层，包含Ru或Ru合金的第一中间层上的第二中间层，以及形成在第一中间层和第二中间层之间的第三中间层，其降低平均簇尺寸 的第二中间层。 第三中间层的厚度为约1.0nm至约3.0nm，并且具有选自由BCC，B2，C11b，L21和D03组成的组的结构。 还提出了其他PMRM和制造方法。

公开(公告)号：US07510789B2

公开(公告)日：2009-03-31

申请号：US11148164

申请日：2005-06-09

申请人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

发明人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

IPC分类号： G11B5/66

CPC分类号： B82Y10/00 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/743 ,  Y10T428/24802

摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.

摘要翻译： 垂直磁记录介质包括由软磁膜和垂直磁化膜之间的多层形成的中间膜。 中间膜包括至少两层，即含氧层或含有氮，硅或碳的非金属元素层，以及在含氧层或非金属元素的表面侧上形成的金属层 包含层。 金属层包括多个孤立的岛状结构。 垂直磁化膜的晶粒形成为对应于孤立的岛状结构。 结果，获得高记录密度。

公开(公告)号：US20080186627A1

公开(公告)日：2008-08-07

申请号：US12061518

申请日：2008-04-02

申请人： Yoshiyuki Hirayama ,  Ikuko Takekuma ,  Ichiro Tamai

发明人： Yoshiyuki Hirayama ,  Ikuko Takekuma ,  Ichiro Tamai

IPC分类号： G11B5/33 ,  G11B5/66 ,  C23C14/34

CPC分类号： G11B5/7325 ,  C23C14/06 ,  C23C14/3492 ,  G11B5/65 ,  G11B5/851 ,  Y02T50/67

摘要： Embodiments of the invention provide a perpendicular magnetic recording medium having a granular structured magnetic recording layer including many columnar grains, and grain boundary layers containing oxide, wherein a high medium S/N ratio is obtained while securing head flyability and durability. In an embodiment, the perpendicular magnetic recording medium includes a granular structured magnetic recording layer having many columnar grains, as well as grain boundary layers including oxide respectively. Assuming that the columnar grains are divided equally in the film thickness direction into a protective layer side portion and an intermediate layer side portion, and the diameter of the protective layer side portion is larger than that of the intermediate layer side portion.

摘要翻译： 本发明的实施例提供一种垂直磁记录介质，其具有包括许多柱状颗粒的粒状结构磁记录层和含有氧化物的晶界层，其中在确保磁头可飞行性和耐久性的同时获得高介质S / N比。 在一个实施例中，垂直磁记录介质包括具有许多柱状晶粒的颗粒结构磁记录层以及分别包括氧化物的晶界层。 假设柱状晶粒在膜厚度方向上被均等地分割成保护层侧部分和中间层侧部分，并且保护层侧部分的直径大于中间层侧部分的直径。

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：US06916557B2

公开(公告)日：2005-07-12

申请号：US10372335

申请日：2003-02-25

申请人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

发明人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

IPC分类号： G11B5/65 ,  B32B3/00 ,  G11B5/147 ,  G11B5/64 ,  G11B5/66 ,  G11B5/667 ,  G11B5/70 ,  G11B5/73 ,  G11B5/851

CPC分类号： B82Y10/00 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/743 ,  Y10T428/24802

摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.

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：US07875373B2

公开(公告)日：2011-01-25

申请号：US11985310

申请日：2007-11-13

申请人： Yoshiyuki Hirayama ,  Ichiro Tamai ,  Reiko Arai

发明人： Yoshiyuki Hirayama ,  Ichiro Tamai ,  Reiko Arai

IPC分类号： G11B5/65

CPC分类号： G11B5/65 ,  G11B5/7325 ,  G11B5/851 ,  Y10T428/11

摘要： Embodiments in accordance with the present invention help to obtain a perpendicular magnetic recording medium having a granular structure, excellent recording/reproducing properties, and excellent durability. According to one embodiment, a recording layer includes a layer which has crystal grains mainly composed of cobalt and crystal grain boundaries mainly composed of the oxide; the oxygen content of the recoding layer is changed in the film thickness direction; the oxygen content in the area in the vicinity of the interface between the recording layer and the intermediate layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer; and the oxygen content in the area in the vicinity of the interface between the recording layer and the protective layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer.

摘要翻译： 根据本发明的实施例有助于获得具有颗粒结构的良好的记录/再现性能和优异的耐久性的垂直磁记录介质。 根据一个实施例，记录层包括主要由钴构成的晶粒和主要由氧化物构成的晶界的层; 记录层的氧含量在膜厚方向上变化; 记录层和中间层之间的界面附近的区域中的氧含量低于记录层中心附近的区域中的氧含量; 并且将记录层和保护层之间的界面附近的区域中的氧含量设定得低于记录层中心附近的区域中的氧含量。

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：US07701667B2

公开(公告)日：2010-04-20

申请号：US11651922

申请日：2007-01-09

申请人： Ichiro Tamai ,  Ikuko Takekuma ,  Hiroaki Nemoto ,  Yoshiyuki Hirayama

发明人： Ichiro Tamai ,  Ikuko Takekuma ,  Hiroaki Nemoto ,  Yoshiyuki Hirayama

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/656 ,  G11B5/667

摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1(emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2(emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).

摘要翻译： 根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质 在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。 在钌或钌合金的中间层上依次形成第一记录层和第二记录层。 第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。 第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。 当第一记录层的饱和磁化强度设定为Ms1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms2（emu /立方厘米），第一记录层膜厚设定为t1（nm） 那么（Ms2-Ms1）×t1将大于0（每平方厘米的记忆），小于0.15（每平方厘米的记忆）。