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。

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。

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.

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.

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：US07005202B2

公开(公告)日：2006-02-28

申请号：US10631768

申请日：2003-08-01

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

摘要： The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US06623874B2

公开(公告)日：2003-09-23

申请号：US09888523

申请日：2001-06-26

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

摘要： The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US06756113B2

公开(公告)日：2004-06-29

申请号：US10077880

申请日：2002-02-20

申请人： Yoshibumi Matsuda ,  Koji Sakamoto ,  Tetsuya Kanbe ,  Yotsuo Yahisa

发明人： Yoshibumi Matsuda ,  Koji Sakamoto ,  Tetsuya Kanbe ,  Yotsuo Yahisa

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/66 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12931 ,  Y10T428/265

摘要： A magnetic recording medium includes a first underlying film of a NiTa alloy having a nonmagnetic amorphous structure and formed on a nonmagnetic substrate, and a second underlying film made of an alloy containing Cr and Ti, further a first magnetic film of a CoCrPt alloy, a nonmagnetic intermediate film of Ru and a second magnetic film of a CoCrPtB alloy that are serially formed over the first underlying film, wherein oxygen locally exists in an interface between the first underlying film and the second underlying film.

摘要翻译： 磁记录介质包括具有非磁性无定形结构并形成在非磁性基底上的NiTa合金的第一底膜，以及由含有Cr和Ti的合金制成的第二底膜，另外还有CoCrPt合金的第一磁性膜， Ru的非磁性中间膜和CoCrPtB合金的第二磁性膜，其顺序地形成在第一底层膜上，其中氧局部存在于第一底层膜和第二底膜之间的界面中。

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：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.