公开(公告)号：US20060228588A1

公开(公告)日：2006-10-12

申请号：US11400736

申请日：2006-04-06

申请人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Tatsuya Hinoue ,  Tomoo Yamamoto

发明人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Tatsuya Hinoue ,  Tomoo Yamamoto

IPC分类号： G11B5/66

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

摘要： A magnetic recording material is provided which has high medium S/N, and provides excellent overwriting characteristic, excellent thermal fluctuation and sufficient stability against thermal fluctuation. In one embodiment, a first underlayer comprising one of alloys of a Ti—Co alloy, a Ti—Co—Ni alloy, and an Ni—Ta alloy, a second underlayer comprising a W—Co alloy or Ta, and a third underlayer of a body-centered cubic structure comprising a Cr—Ti—B alloy or a Cr—Ti alloy are disposed over a substrate. A first magnetic layer comprising a Co—Cr—B alloy or a Co—Cr—Ta alloy, a second magnetic layer comprising a Co—Cr—Pt—B—Ta alloy, a third magnetic layer comprising a Co—Cr—Pt—B alloy, and a protective film are disposed further thereover. An intermediate region (Th) is disposed between the second magnetic layer and the third magnetic layer, the intermediate region having a higher oxygen concentration than those of the magnetic layers.

摘要翻译： 提供具有高介质S / N的磁记录材料，并提供优异的重写特性，优异的热波动和对热波动的足够的稳定性。 在一个实施例中，包括Ti-Co合金，Ti-Co-Ni合金和Ni-Ta合金的合金之一的第一底层，包含W-Co合金或Ta的第二底层和第三底层 将包含Cr-Ti-B合金或Cr-Ti合金的体心立方结构设置在基板上。 包含Co-Cr-B合金或Co-Cr-Ta合金的第一磁性层，包含Co-Cr-Pt-B-Ta合金的第二磁性层，包含Co-Cr-Pt- B合金和保护膜进一步配置。 中间区域（Th）设置在第二磁性层和第三磁性层之间，中间区域的氧浓度高于磁性层的氧浓度。

公开(公告)号：US07876530B2

公开(公告)日：2011-01-25

申请号：US12387164

申请日：2009-04-28

申请人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Jo Inagaki ,  Hiroyuki Suzuki ,  Masae Suzuki, legal representative ,  Hidekazu Kashiwase

发明人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Jo Inagaki ,  Hiroyuki Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/66 ,  B32B3/02

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  H01F10/16 ,  H01F10/265

摘要： In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.

摘要翻译： 在一个实施例中，磁记录介质包括在衬底上依次形成的下面的膜，磁性膜和保护膜。 磁性膜是含有铬的钴基合金膜，并且具有堆叠而不插入任何非磁性层的多个磁性层。 多个磁性层包括第一，第二和第三磁性层。 第一磁性层设置在下面的膜和第二磁性层之间。 第二磁性层设置在第一磁性层和第三磁性层之间。 第三磁性层设置在第二磁性层和保护膜之间。 第一磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。 第一磁性层的厚度小于第二磁性层的厚度。 覆盖在第一磁性层上的磁性层还含有铂和硼。 第三磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。

公开(公告)号：US07532436B2

公开(公告)日：2009-05-12

申请号：US11223603

申请日：2005-09-09

申请人： Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

发明人： Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/31 ,  G11B5/656 ,  G11B5/66

摘要： A longitudinal magnetic recording medium having a high medium S/N, with no problems in view of the overwrite characteristic, excellent in the bit error rate and sufficiently stable also to thermal fluctuations is provided. In one embodiment, a first underlayer, second underlayer, and a third underlayer are formed on a substrate and, further, a first magnetic layer, a spacer layer including Ru as a main ingredient, a second magnetic layer, and a third magnetic layer are formed in adjacent with each other in this order. The thickness of the second magnetic layer is made larger than the thickness of the third magnetic layer and the total for the concentrations of cobalt and platinum obtained in the second magnetic layer is not more than the total for the concentrations of cobalt and platinum contained in the third magnetic layer.

摘要翻译： 提供具有高介质S / N的纵向磁记录介质，考虑到重写特性没有问题，具有优异的误码率和足够稳定的热波动。 在一个实施例中，在基板上形成第一底层，第二底层和第三底层，此外，第一磁性层，包括Ru作为主要成分的间隔层，第二磁性层和第三磁性层是 以这种顺序彼此相邻地形成。 使第二磁性层的厚度大于第三磁性层的厚度，并且在第二磁性层中获得的钴和铂的浓度的总和不超过包含在第二磁性层中的钴和铂的浓度的总和 第三磁性层。

公开(公告)号：US07163756B2

公开(公告)日：2007-01-16

申请号：US10733928

申请日：2003-12-10

申请人： Tomoo Yamamoto ,  Yotsuo Yahisa ,  Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Tetsuya Kanbe ,  Hiroyuki Suzuki

发明人： Tomoo Yamamoto ,  Yotsuo Yahisa ,  Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Tetsuya Kanbe ,  Hiroyuki Suzuki

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/7325

摘要： A large-capacity, low-cost, longitudinal magnetic recording medium capable of ultra-high-density recording of 70 Gigabits or more per square inch is disclosed. The longitudinal magnetic recording medium of the present invention comprises a first seed layer, a second seed layer, a first underlayer, a second underlayer, and a magnetic layer, which are formed on a nonmagnetic substrate in this order. A material containing at least Al and any one of Ru and Re is used to form the second seed layer, and a material containing at least any one of Co and Ni and one or both of Al and Ti is used to form the first underlayer. It is also possible to use Cr or a Cr alloy containing Cr and at least one element selected from the constituent element group A consisting of Ti, Mo, and W for forming the second seed layer.

摘要翻译： 公开了能够以每平方英寸70吉比特或更多的超高密度记录的大容量，低成本的纵向磁记录介质。 本发明的纵向磁记录介质包括依次形成在非磁性基板上的第一种子层，第二籽晶层，第一底层，第二底层和磁性层。 使用至少包含Al和Ru和Re中的任何一种的材料来形成第二种子层，并且使用包含Co和Ni中的至少一种以及Al和Ti中的一种或两种的材料来形成第一底层。 也可以使用含有Cr的Cr或Cr合金和选自由Ti，Mo和W构成的构成元素组A中的至少一种元素来形成第二种子层。

公开(公告)号：US20060057429A1

公开(公告)日：2006-03-16

申请号：US11223603

申请日：2005-09-09

申请人： Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

发明人： Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/31 ,  G11B5/656 ,  G11B5/66

摘要： A longitudinal magnetic recording medium having a high medium S/N, with no problems in view of the overwrite characteristic, excellent in the bit error rate and sufficiently stable also to thermal fluctuations is provided. In one embodiment, a first underlayer, second underlayer, and a third underlayer are formed on a substrate and, further, a first magnetic layer, a spacer layer including Ru as a main ingredient, a second magnetic layer, and a third magnetic layer are formed in adjacent with each other in this order. The thickness of the second magnetic layer is made larger than the thickness of the third magnetic layer and the total for the concentrations of cobalt and platinum obtained in the second magnetic layer is not more than the total for the concentrations of cobalt and platinum contained in the third magnetic layer.

公开(公告)号：US07545604B2

公开(公告)日：2009-06-09

申请号：US11317344

申请日：2005-12-22

申请人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

发明人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/66 ,  B32B3/02

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  H01F10/16 ,  H01F10/265

摘要： In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.

摘要翻译： 在一个实施例中，磁记录介质包括在衬底上依次形成的下面的膜，磁性膜和保护膜。 磁性膜是含有铬的钴基合金膜，并且具有堆叠而不插入任何非磁性层的多个磁性层。 多个磁性层包括第一，第二和第三磁性层。 第一磁性层设置在下面的膜和第二磁性层之间。 第二磁性层设置在第一磁性层和第三磁性层之间。 第三磁性层设置在第二磁性层和保护膜之间。 第一磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。 第一磁性层的厚度小于第二磁性层的厚度。 覆盖在第一磁性层上的磁性层还含有铂和硼。 第三磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。

公开(公告)号：US20090258253A1

公开(公告)日：2009-10-15

申请号：US12387164

申请日：2009-04-28

申请人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

发明人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  H01F10/16 ,  H01F10/265

摘要： In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.

摘要翻译： 在一个实施例中，磁记录介质包括在衬底上依次形成的下面的膜，磁性膜和保护膜。 磁性膜是含有铬的钴基合金膜，并且具有堆叠而不插入任何非磁性层的多个磁性层。 多个磁性层包括第一，第二和第三磁性层。 第一磁性层设置在下面的膜和第二磁性层之间。 第二磁性层设置在第一磁性层和第三磁性层之间。 第三磁性层设置在第二磁性层和保护膜之间。 第一磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。 第一磁性层的厚度小于第二磁性层的厚度。 覆盖在第一磁性层上的磁性层还含有铂和硼。 第三磁性层中含有的铬的浓度低于第二磁性层中含有的铬的浓度。

公开(公告)号：US20060139806A1

公开(公告)日：2006-06-29

申请号：US11317344

申请日：2005-12-22

申请人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

发明人： Tatsuya Hinoue ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Joe Inagaki ,  Hiroyuko Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/82

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  H01F10/16 ,  H01F10/265

摘要： In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.

公开(公告)号：US20060292401A1

公开(公告)日：2006-12-28

申请号：US11415604

申请日：2006-05-01

申请人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Akira Morinaga ,  Tatsuya Hinoue

发明人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Akira Morinaga ,  Tatsuya Hinoue

IPC分类号： G11B5/66

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

摘要： A bit error rate is improved and, at the same time, an aging change due to thermal fluctuation is decreased. In one embodiment, a magnetic recording medium has first, second, third, and fourth magnetic layers stacked over the underlayer film on a substrate. The product (Brt2) of the residual magnetic flux density and film thickness of the second magnetic layer is smaller than the product (Brt3) of the residual magnetic flux density and film thickness of the third magnetic layer. The second magnetic layer has a thickness larger than that of the third magnetic layer and is anti-ferromagnetically coupled with the first magnetic layer by way of the first non-magnetic intermediate layer. The fourth magnetic layer is formed by way of a second non-magnetic intermediate layer above the third magnetic layer. The product (Brt4) of the residual magnetic flux density and film thickness of the fourth magnetic layer is from about 47% to 52% of the product (Brt_total) of the residual magnetic flux density and film thickness of the entire magnetic layers in a state of residual magnetization with the external magnetic field removed.

摘要翻译： 改善了误码率，同时由于热波动引起的老化变化也降低。 在一个实施例中，磁记录介质具有层叠在基底上的下层膜上的第一，第二，第三和第四磁性层。 第二磁性层的剩余磁通密度和膜厚的乘积（Brt2）小于第三磁性层的剩余磁通密度和膜厚的乘积（Brt3）。 第二磁性层的厚度大于第三磁性层的厚度，并通过第一非磁性中间层与第一磁性层反铁磁耦合。 第四磁性层通过在第三磁性层上方的第二非磁性中间层形成。 剩余磁通密度和第四磁性层的膜厚的乘积（Brt4）为剩余磁通密度的乘积的约47％至52％（Brt_total）和处于整个状态的整个磁性层的膜厚度 的剩余磁化与外部磁场去除。

公开(公告)号：US07704613B2

公开(公告)日：2010-04-27

申请号：US11415604

申请日：2006-05-01

申请人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Akira Morinaga ,  Tatsuya Hinoue

发明人： Hiroyuki Suzuki ,  Hidekazu Kashiwase ,  Akira Morinaga ,  Tatsuya Hinoue

IPC分类号： G11B5/66

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

摘要： A bit error rate is improved and, at the same time, an aging change due to thermal fluctuation is decreased. In one embodiment, a magnetic recording medium has first, second, third, and fourth magnetic layers stacked over the underlayer film on a substrate. The product (Brt2) of the residual magnetic flux density and film thickness of the second magnetic layer is smaller than the product (Brt3) of the residual magnetic flux density and film thickness of the third magnetic layer. The second magnetic layer has a thickness larger than that of the third magnetic layer and is anti-ferromagnetically coupled with the first magnetic layer by way of the first non-magnetic intermediate layer. The fourth magnetic layer is formed by way of a second non-magnetic intermediate layer above the third magnetic layer. The product (Brt4) of the residual magnetic flux density and film thickness of the fourth magnetic layer is from about 47% to 52% of the product (Brt_total) of the residual magnetic flux density and film thickness of the entire magnetic layers in a state of residual magnetization with the external magnetic field removed.

摘要翻译： 改善了误码率，同时由于热波动引起的老化变化也降低。 在一个实施例中，磁记录介质具有层叠在基底上的下层膜上的第一，第二，第三和第四磁性层。 第二磁性层的剩余磁通密度和膜厚的乘积（Brt2）小于第三磁性层的剩余磁通密度和膜厚的乘积（Brt3）。 第二磁性层的厚度大于第三磁性层的厚度，并通过第一非磁性中间层与第一磁性层反铁磁耦合。 第四磁性层通过在第三磁性层上方的第二非磁性中间层形成。 剩余磁通密度和第四磁性层的膜厚的乘积（Brt4）为剩余磁通密度的乘积的约47％至52％（Brt_total）和处于整个状态的整个磁性层的膜厚度 的剩余磁化与外部磁场去除。