公开(公告)号：US5238483A

公开(公告)日：1993-08-24

申请号：US921093

申请日：1992-07-29

申请人： Akio Mishima ,  Mamoru Tanihara ,  Yasutaka Ota ,  Hirofumi Kawasaki ,  Kenji Okinaka ,  Kunio Ikemoto ,  Kousaku Tamari ,  Kohji Mori ,  Norimichi Nagai

发明人： Akio Mishima ,  Mamoru Tanihara ,  Yasutaka Ota ,  Hirofumi Kawasaki ,  Kenji Okinaka ,  Kunio Ikemoto ,  Kousaku Tamari ,  Kohji Mori ,  Norimichi Nagai

IPC分类号： G11B5/706

CPC分类号： G11B5/70615

摘要： Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.

摘要翻译： 本文公开了用于磁记录的针状磁性铁基合金颗粒，其含有1.5至10mol％的基于Fe的B（以B计）和1.5至10mol％的基于Fe（以Co计算）的Co在附近 所述颗粒的表面具有不小于125emu / g的饱和磁化强度和SFD 值不大于0.50，及其制造方法。

公开(公告)号：US5156922A

公开(公告)日：1992-10-20

申请号：US728328

申请日：1991-07-08

申请人： Akio Mishima ,  Mamoru Tanihara ,  Yasutaka Ota ,  Hirofumi Kawasaki ,  Kenji Okinaka ,  Kunio Ikemoto ,  Kousaku Tamari ,  Kohji Mori ,  Norimichi Nagai

发明人： Akio Mishima ,  Mamoru Tanihara ,  Yasutaka Ota ,  Hirofumi Kawasaki ,  Kenji Okinaka ,  Kunio Ikemoto ,  Kousaku Tamari ,  Kohji Mori ,  Norimichi Nagai

IPC分类号： G11B5/706

CPC分类号： G11B5/70615 ,  Y10T428/12181

摘要： Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.

公开(公告)号：US06753077B2

公开(公告)日：2004-06-22

申请号：US09741890

申请日：2000-12-22

申请人： Kenichi Nakata ,  Kousaku Tamari ,  Jun Koujima ,  Teruaki Santoki

发明人： Kenichi Nakata ,  Kousaku Tamari ,  Jun Koujima ,  Teruaki Santoki

IPC分类号： G11B562

CPC分类号： G11B5/653 ,  G11B5/64 ,  G11B5/656 ,  G11B5/84 ,  G11B5/851 ,  Y10T428/265

摘要： A magnetic recording medium including a substrate and formed on the substrate a maghemite thin film having a surface roughness represented by a center line mean roughness Ra of 0.1 to 1.0 nm, and a coercive force squareness S* value of not less than 0.50. This magnetic recording medium exhibits excellent magnetic properties, especially, coercive force squareness S* value and a more enhanced surface smoothness.

摘要翻译： 一种包括基板的磁记录介质，在基板上形成具有中心线平均粗糙度Ra为0.1〜1.0nm，矫顽力矩S *值为0.50以上的表面粗糙度的磁赤铁矿薄膜。 该磁记录介质表现出优异的磁特性，特别是矫顽力矩S *值和更强的表面平滑度。

公开(公告)号：US5628953A

公开(公告)日：1997-05-13

申请号：US568825

申请日：1995-12-07

申请人： Kousaku Tamari

发明人： Kousaku Tamari

IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/85 ,  H01F10/14 ,  H01F10/16 ,  H01F10/20 ,  H01F10/32 ,  H01F41/16 ,  H01F41/18 ,  B29C71/02

CPC分类号： B82Y25/00 ,  G11B5/656 ,  H01F10/16 ,  H01F10/32 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： Disclosed herein is a perpendicular magnetic film comprising a spinel thin film which is formed on a substrate, which contains Fe as the main ingredient and further contains Co and Ni, and which has a coercive force of less than 3000 Oe, the plane (400) thereof being predominantly oriented in parallel with said substrate, the spacing of the plane (400) being not more than 2.082 .ANG., the molar ratio of Co to Fe being 0.005 to 0.32 and the molar ratio of Ni to Co being at least 0.6.

摘要翻译： 本文公开了一种垂直磁性膜，其包含尖晶石薄膜，该尖晶石薄膜形成在基板上，其以Fe为主成分，并且还含有Co和Ni，并且具有小于3000Oe的矫顽力，平面（400） 其主要与所述基底平行取向，所述平面（400）的间距不大于2.082，Co与Fe的摩尔比为0.005-0.32，Ni与Co的摩尔比至少为0.6。

公开(公告)号：US06221519B1

公开(公告)日：2001-04-24

申请号：US09272622

申请日：1999-03-19

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404 ,  Y10S428/90

摘要： A magnetic recording medium comprising: a plastic substrate; a nickel oxide underlayer formed on said substrate; and a cobalt-containing maghemite thin film formed on said nickel oxide underlayer, containing cobalt at a molar ratio of cobalt to iron of 0.01:1 to 0.1:1, and having either a spacing of a plane (311) of not more than 2.510 Å, a spacing of a plane (222) of not more than 2.415 Å or a spacing of a plane (220) of not more than 2.950 Å, a ratio value of an X-ray diffraction pattern peak intensity of either of the planes (311), (222) and (220) of said cobalt-containing maghemite thin film to an X-ray diffraction pattern peak intensity of the plane (400) thereof being more than 0.5. Such magnetic recording medium suitably applicable to existent magnetic recording systems using a ring-type magnetic head and capable of using a plastic substrate for providing a magnetic recording medium for high-density recording.

摘要翻译： 一种磁记录介质，包括：塑料基板;形成在所述基板上的氧化镍底层; 和在所述氧化镍底层上形成的含钴的磁赤铁矿薄膜，其含有钴与铁的摩尔比为0.01:1至0.1:1的钴，并且具有不大于2.510的平面（311）的间隔 ，平面（222）的间距不大于2.415或平面（220）的间距不大于2.950，任一平面（311）的X射线衍射图峰值强度的比值 ），所述含钴磁赤铁矿薄膜的（222）和（220）相对于所述平面（400）的X射线衍射图峰值强度大于0.5。 这种磁记录介质适用于使用环形磁头的现有磁记录系统，并能够使用塑料基板提供用于高密度记录的磁记录介质。

公开(公告)号：US5580671A

公开(公告)日：1996-12-03

申请号：US110822

申请日：1993-08-24

申请人： Kousaku Tamari ,  Takanori Doi

发明人： Kousaku Tamari ,  Takanori Doi

IPC分类号： H01F10/16 ,  G11B5/64 ,  G11B5/66 ,  H01F10/20 ,  H01F10/30 ,  H01F41/18

CPC分类号： G11B5/653 ,  G11B5/656 ,  G11B5/66 ,  Y10S428/90

摘要： Disclosed herein is a perpendicular magnetic film comprising a Co-containing .gamma.-Fe.sub.2 O.sub.3 film formed on a substrate in which the plane (400) is predominantly oriented in parallel with said substrate, the molar ratio of Co to Fe is between 0.01 and 0.32, the spacing of said plane (400) is not more than 2.084 .ANG., and the optical absorption coefficient at 700 nm is not more than 2.5 .mu.m.sup.-1.

摘要翻译： 本文公开了一种垂直磁性膜，其包含在基板上形成的含Co的γ-Fe 2 O 3膜，其中平面（400）主要与所述基板平行取向，Co与Fe的摩尔比为0.01至0.32， 所述平面（400）的间隔不大于2.084，700nm处的光吸收系数不大于2.5μm-1。

公开(公告)号：US06268024B1

公开(公告)日：2001-07-31

申请号：US09276520

申请日：1999-03-25

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： H05H100

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404

摘要： A magnetic recording medium is prepared by forming on a plastic substrate, a nickel oxide underlayer having a plane (200) which is predominantly oriented in parallel with the surface of the plastic substrate, then forming on the nickel oxide underlayer at a substrate temperature of less 240° C., a cobalt-containing magnetite thin film having a plane (400) which is predominantly oriented in parallel with the surface of the plastic substrate, and finally oxidizing the cobalt-containing magnetite thin film in a plasma-activated oxygen atmosphere containing a rare gas at a substrate temperature of less than 240° C. while incorporating the rare gas into oxygen. This results in a cobalt-containing maghemite thin film as a perpendicular magnetic film having a spacing of a plane (400) of not more than 2.082 Å. The magnetic recording medium so produced is useful for high-density recording using a plastic substrate.

摘要翻译： 通过在塑料基板上形成氧化镍底层制备磁记录介质，所述氧化镍底层具有主要与塑料基板的表面平行取向的平面（200），然后在较低的基板温度下在氧化镍底层上形成 240℃的含钴磁铁矿薄膜，其具有主要与塑料基板的表面平行取向的平面（400），最后在等离子体激活的氧气氛中氧化含钴磁铁矿薄膜，其中含有 在低于240℃的衬底温度下的稀有气体，同时将稀有气体并入氧气中。 这导致含有钴的磁赤铁矿薄膜作为垂直磁性膜，其平面（400）的间隔不大于2.082。 所制造的磁记录介质对于使用塑料基板的高密度记录是有用的。

公开(公告)号：US5589261A

公开(公告)日：1996-12-31

申请号：US328135

申请日：1994-10-24

申请人： Kousaku Tamari

发明人： Kousaku Tamari

IPC分类号： G11B11/10 ,  G11B5/127 ,  G11B5/64 ,  G11B5/66 ,  G11B5/673 ,  G11B5/85 ,  G11B5/851 ,  G11B11/105 ,  H01F10/18 ,  H01F10/20 ,  H01F10/32 ,  B05D5/12 ,  B32B5/16 ,  C23C14/00

CPC分类号： B82Y25/00 ,  G11B11/10586 ,  G11B5/66 ,  H01F10/3218 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： Disclosed herein is a perpendicular magnetic film comprising at least two of a (A)/(B) unit or (B)/(A) unit obtained by disposing a spinel type crystal layer (A) represented by the following general formula:A.sub.x Fe.sub.3-x O.sub.4(wherein A is a transition metal, and x is not more than 1), anda spinel type crystal layer (B) represented by the following general formula:B.sub.y Co.sub.3-y O.sub.4(wherein B is a transition metal, and y is not more than 1), in the order of (A) and (B) or (B) and (A).

摘要翻译： 本文公开了一种垂直磁性膜，其包括通过将由以下通式表示的尖晶石型晶体层（A）：AxFe3-（A）/（A）/（B））或（B）/（A） xO4（其中A是过渡金属，x不大于1），以及由以下通式表示的尖晶石型晶体层（B）：ByCo3-yO4（其中B是过渡金属，y不更大 （A）和（B）或（B）和（A）的顺序。

公开(公告)号：US06187462B1

公开(公告)日：2001-02-13

申请号：US09272618

申请日：1999-03-19

申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/656 ,  G11B5/84 ,  G11B5/851 ,  Y10S428/90

摘要： A magnetic recording medium of the present invention comprises: a plastic substrate; and a cobalt-containing maghemite thin film formed on said substrate, containing cobalt at a molar ratio of cobalt to iron of not more than 0.06:1, and having either a spacing of a plane (311) of not more than 2.510 Å, a spacing of a plane (222) of not more than 2.415 Å or a spacing of a plane (220) of not more than 2.950 Å; and has a coercive force of not less than 2,000 Oe. Such magnetic recording medium suitably applicable to existent magnetic recording systems using a ring-type magnetic head and capable of using a plastic substrate for providing a magnetic recording medium for high-density recording.

摘要翻译： 本发明的磁记录介质包括：塑料基板; 以及在所述基板上形成的含有钴与铁的摩尔比为0.06：1以下且具有不大于2.51的平面（311）间隔的钴的磁赤铁矿薄膜， 平面（222）的间距不大于2.415埃或平面（220）的间距不大于2.950埃; 并具有不低于2000 Oe的矫顽力。 这种磁记录介质适用于使用环形磁头的现有磁记录系统，并能够使用塑料基板提供用于高密度记录的磁记录介质。

公开(公告)号：US6165608A

公开(公告)日：2000-12-26

申请号：US161999

申请日：1998-09-29

申请人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

发明人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

IPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/851 ,  H01F10/16

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

摘要： A magnetic recording medium of the present invention comprises:a substrate; anda cobalt-containing maghemite thin film formed on said substrate, containing cobalt at a molar ratio of cobalt to iron of not more than 0.06:1, having either a spacing of a (311) plane of not more than 2.510 .ANG., a spacing of a (222) plane of not more than 2.415 .ANG. or a spacing of a (220) plane of not more than 2.950 .ANG., and having a coercive force of not less than 1,800 Oe.Such a magnetic recording medium has as high a coercive force as possible, specifically not less than 1,800 Oe, and exhibits an excellent stability independent to change in passage of time and a large output in a high recording frequency region.

摘要翻译： 本发明的磁记录介质包括：基板; 和在所述基板上形成的含钴磁赤铁矿薄膜，其含有钴与铁的摩尔比不大于0.06:1的钴，其间隔（311）面不大于2.510安培，间距 （222）平面的不大于2.415安培的平面或（220）平面间距不大于2.950安培，并具有不小于1,800 Oe的矫顽力。 这样的磁记录介质具有尽可能高的矫顽力，特别是不低于1,800Oe，并且表现出与在高记录频率区域中随时间变化和大输出无关的优异的稳定性。