公开(公告)号：US08012613B2

公开(公告)日：2011-09-06

申请号：US12663350

申请日：2008-06-06

申请人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

发明人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  Y10T428/11

摘要： A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

摘要翻译： 提供了一种磁记录介质，其具有至少一个软磁层，至少一个种子层，至少一个底层和至少一个垂直磁记录层，其特征在于该或每个种子层由共价 粘合材料。 共价键合的材料优选主要包含具有六方晶系结构的氮化物，更优选主要包含具有六方纤锌矿晶体结构的氮化铝。 这种磁记录介质在高密度记录和再现信息方面是优越的。

公开(公告)号：US07989097B2

公开(公告)日：2011-08-02

申请号：US11492809

申请日：2006-07-26

申请人： Tomoyuki Maeda

发明人： Tomoyuki Maeda

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/65 ,  G11B5/8404

摘要： According to one embodiment, a magnetic recording medium includes a substrate, a first underlayer formed on the substrate and including an amorphous alloy containing Ni, a crystalline second underlayer formed on the first underlayer and including simple Cr or an alloy containing Cr, and a magnetic recording layer formed on the second underlayer and including at least one element of Fe and Co and at least one element of Pt and Pd, and containing magnetic crystal grains having an L10 structure. An oxygen amount remaining on the upper surface of the second underlayer is larger than an oxygen amount remaining on the lower surface of the second underlayer, and a normal line to a (001) plane of the magnetic crystal grains in the magnetic recording layer is oriented with a tilt angle in a range of 3 to 25° to a normal line to a medium plane.

摘要翻译： 根据一个实施例，磁记录介质包括基板，形成在基板上的第一底层，并且包括含有Ni的非晶合金，形成在第一底层上的晶体第二底层，并且包括简单的Cr或含有Cr的合金以及磁 记录层，形成在第二底层上，并且包含至少一种Fe和Co元素以及至少一种Pt和Pd元素，并含有具有L10结构的磁性晶粒。 残留在第二底层的上表面上的氧量大于残留在第二底层的下表面上的氧量，并且磁记录层中磁性晶粒的（001）面的法线定向 相对于中等平面的法线为3〜25°的范围的倾斜角。

公开(公告)号：US20110151280A1

公开(公告)日：2011-06-23

申请号：US12675090

申请日：2008-08-28

申请人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

发明人： Migaku Takahashi ,  Shin Saito ,  Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto ,  Akihiko Takeo ,  Tomoyuki Maeda

IPC分类号： G11B5/66 ,  G11B5/127 ,  C23C14/34 ,  C30B23/02

CPC分类号： G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  G11B5/851

摘要： A perpendicular magnetic recording medium including at least a soft under layer, an orientation control layer, a magnetic recording layer and a protective layer on a non-magnetic substrate, wherein the orientation control layer is composed of three or more layers including a seed layer, a first intermediate layer and a second intermediate layer sequentially, formed in that order from the substrate side, the crystal grains that constitute the first intermediate layer are epitaxially grown on the crystal grains of the seed layer, the crystal grains that constitute the second intermediate layer are epitaxially grown on the crystal grains of the first intermediate layer, and the crystal grains that constitute the second intermediate layer are finer than the crystal grains that constitute the first intermediate layer.

摘要翻译： 一种在非磁性基板上至少含有软底层，取向控制层，磁记录层和保护层的垂直磁记录介质，其中所述取向控制层由三层或更多层构成，包括种子层， 从衬底侧依次形成第一中间层和第二中间层，构成第一中间层的晶粒在籽晶层的晶粒上外延生长，构成第二中间层的晶粒 在第一中间层的晶粒上外延生长，构成第二中间层的晶粒比构成第一中间层的晶粒更细。

公开(公告)号：US07781081B2

公开(公告)日：2010-08-24

申请号：US10583951

申请日：2004-12-24

申请人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  C23C14/0688 ,  C23C14/185 ,  G11B5/65 ,  G11B5/656 ,  G11B5/712 ,  G11B5/85

摘要： A magnetic recording medium 62 wherein a substrate 11, undercoating layers 13 and 14 formed on the substrate 11, and a magnetic recording layer 15, which include the magnetic crystal grain and the grain boundary field which encloses magnetic crystal grains, are included. The grain boundary field includes Ti oxide, and the ratio of the substance amount of the Ti oxide in the magnetic recording layer 15 is 5 mol % or more and 15 mol % or less, and the Ti oxide includes at least TiO and/or Ti2O3s.

摘要翻译： 包括磁记录介质62，其中包括形成在基板11上的基板11，底涂层13和14以及磁记录层15，其包括磁晶粒和包围磁晶粒的晶界。 晶界包括Ti氧化物，磁记录层15中的Ti氧化物的物质的比例为5摩尔％以上且15摩尔％以下，Ti氧化物至少包含TiO和/或Ti 2 O 3 。

公开(公告)号：US20100173175A1

公开(公告)日：2010-07-08

申请号：US12663350

申请日：2008-06-06

申请人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

发明人： Migaku Takahashi ,  Shin Saito ,  Tomoyuki Maeda ,  Akihiko Takeo ,  Yuzo Sasaki ,  Ryuji Sakaguchi

IPC分类号： G11B5/33 ,  B05D5/12

CPC分类号： G11B5/732 ,  Y10T428/11

摘要： A magnetic recording medium is provided, which has at least one soft magnetic layer, at least one seed layer, at least one underlayer and at least one perpendicular magnetic recording layer, and is characterized in that the or each seed layer is comprised of a covalently bonded material. The covalently bonded material preferably predominantly comprises a nitride having a hexagonal crystal structure, more preferably, predominantly comprises aluminum nitride having a hexagonal wurtzite crystal structure. This magnetic recording medium is superior in recording and reproducing an information with high density.

摘要翻译： 提供了一种磁记录介质，其具有至少一个软磁层，至少一个种子层，至少一个底层和至少一个垂直磁记录层，其特征在于该或每个种子层由共价 粘合材料。 共价键合的材料优选主要包含具有六方晶系结构的氮化物，更优选主要包含具有六方纤锌矿晶体结构的氮化铝。 这种磁记录介质在高密度记录和再现信息方面是优越的。

公开(公告)号：US20090201607A1

公开(公告)日：2009-08-13

申请号：US12320602

申请日：2009-01-29

申请人： Yousuke Isowaki ,  Tomoyuki Maeda ,  Yoshiyuki Kamata

发明人： Yousuke Isowaki ,  Tomoyuki Maeda ,  Yoshiyuki Kamata

IPC分类号： G11B5/127 ,  G11B5/66

CPC分类号： G11B5/66 ,  B82Y10/00 ,  G11B5/743 ,  G11B5/82 ,  G11B5/855

摘要： It is made possible to provide a patterned perpendicular magnetic recording medium that has smaller write magnetic field and the variation of magnetic characteristics in the bit regions, generates fewer reversed magnetic domains in the position control information regions of the head, and has excellent thermal stability. A patterned perpendicular magnetic recording medium includes: a nonmagnetic substrate; a soft magnetic base layer formed on the nonmagnetic substrate; a nonmagnetic intermediate layer formed on the soft magnetic base layer; and a perpendicular magnetic recording layer formed on the nonmagnetic intermediate layer, and including a stacked structure of a CoPt-based crystalline film having a Pt content in the range of 5 atomic percent to 35 atomic percent and a rare-earth and transition metal alloy amorphous film formed on the CoPt-based crystalline film. The CoPt-based crystalline film and the rare-earth and transition metal alloy amorphous film are exchange-coupled.

摘要翻译： 可以提供具有较小写入磁场和位区域中的磁特性变化的图案化垂直磁记录介质，在头部的位置控制信息区域中产生较少的反向磁畴，并且具有优异的热稳定性。 图案化的垂直磁记录介质包括：非磁性基板; 形成在非磁性基板上的软磁性基层; 形成在软磁性基底层上的非磁性中间层; 以及形成在非磁性中间层上的垂直磁记录层，并且包括Pt含量在5原子％至35原子％范围内的CoPt基结晶膜的堆叠结构和稀土和过渡金属合金无定形 在基于CoPt的结晶膜上形成的膜。 基于CoPt的结晶膜和稀土和过渡金属合金非晶膜是交换耦合的。

公开(公告)号：US20090161255A1

公开(公告)日：2009-06-25

申请号：US12242506

申请日：2008-09-30

申请人： Tomoyuki Maeda

发明人： Tomoyuki Maeda

IPC分类号： G11B5/127 ,  G11B5/667

CPC分类号： G11B5/667 ,  G11B5/7325 ,  G11B5/855

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, soft magnetic underlying layer, nonmagnetic underlying layer, and perpendicular magnetic recording layer. The perpendicular magnetic recording layer has an array of magnetic structures each corresponding to 1 bit of recording information, and includes a crystalline hard magnetic recording layer having perpendicular magnetic anisotropy, and an amorphous soft magnetic recording layer. The hard and soft magnetic recording layers are coupled by exchange coupling.

摘要翻译： 根据一个实施例，垂直磁记录介质包括基底，软磁下层，非磁性下层和垂直磁记录层。 垂直磁记录层具有各自对应于1位记录信息的磁结构阵列，并且包括具有垂直磁各向异性的结晶硬磁记录层和非晶软磁记录层。 硬和软磁记录层通过交换耦合耦合。

公开(公告)号：US20080057348A1

公开(公告)日：2008-03-06

申请号：US10541905

申请日：2004-01-14

申请人： Kenji Shimizu ,  Akira Sakawaki ,  Kazuo Kobayashi ,  Nguyen Tien Duong ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Soichi Oikawa ,  Tomoyuki Maeda ,  Futoshi Nakamura

发明人： Kenji Shimizu ,  Akira Sakawaki ,  Kazuo Kobayashi ,  Nguyen Tien Duong ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Soichi Oikawa ,  Tomoyuki Maeda ,  Futoshi Nakamura

IPC分类号： G11B5/64 ,  B05D5/12 ,  G11B5/33

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/8404

摘要： A soft magnetic undercoat film, a first undercoat film, a second undercoat film, a perpendicular magnetic recording film, and a protective film are provided on a non-magnetic substrate, and the first undercoat film consists of Pt, Pd, or an alloy including at least one among these, and the second undercoat film consists of Ru or an Ru alloy.

摘要翻译： 在非磁性基板上设置软磁性底涂层，第一底涂膜，第二底涂膜，垂直磁记录膜和保护膜，第一底涂层由Pt，Pd或包含 其中至少一个，第二底涂膜由Ru或Ru合金组成。

公开(公告)号：US20070148500A1

公开(公告)日：2007-06-28

申请号：US10583951

申请日：2004-12-24

申请人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/65 ,  G11B5/66 ,  C23C14/00

CPC分类号： G11B5/7325 ,  C23C14/0688 ,  C23C14/185 ,  G11B5/65 ,  G11B5/656 ,  G11B5/712 ,  G11B5/85

摘要： A magnetic recording medium 62 wherein a substrate 11, undercoating layers 13 and 14 formed on the substrate 11, and a magnetic recording layer 15, which include the magnetic crystal grain and the grain boundary field which encloses magnetic crystal grains, are included. The grain boundary field includes Ti oxide, and the ratio of the substance amount of the Ti oxide in the magnetic recording layer 15 is 5 mol % or more and 15 mol % or less, and the Ti oxide includes at least TiO and/or Ti2O3s.

摘要翻译： 包括磁记录介质62，其中包括形成在基板11上的基板11，底涂层13和14以及磁记录层15，其包括磁晶粒和包围磁晶粒的晶界。 晶界包含Ti氧化物，磁记录层15中的Ti氧化物的物质的比例为5摩尔％以上且15摩尔％以下，Ti氧化物至少包含TiO和/或Ti 2＆lt; 3＆gt; 3＆lt; 3＆gt;

公开(公告)号：US20070026262A1

公开(公告)日：2007-02-01

申请号：US11492809

申请日：2006-07-26

申请人： Tomoyuki Maeda

发明人： Tomoyuki Maeda

IPC分类号： G11B5/66 ,  B05D5/12

CPC分类号： G11B5/7325 ,  G11B5/65 ,  G11B5/8404

摘要： According to one embodiment, a magnetic recording medium includes a substrate, a first underlayer formed on the substrate and including an amorphous alloy containing Ni, a crystalline second underlayer formed on the first underlayer and including simple Cr or an alloy containing Cr, and a magnetic recording layer formed on the second underlayer and including at least one element of Fe and Co and at least one element of Pt and Pd, and containing magnetic crystal grains having an L10 structure. An oxygen amount remaining on the upper surface of the second underlayer is larger than an oxygen amount remaining on the lower surface of the second underlayer, and a normal line to a (001) plane of the magnetic crystal grains in the magnetic recording layer is oriented with a tilt angle in a range of 3 to 25° to a normal line to a medium plane.

摘要翻译： 根据一个实施例，磁记录介质包括基板，形成在基板上的第一底层，并且包括含有Ni的非晶合金，形成在第一底层上的晶体第二底层，并且包括简单的Cr或含有Cr的合金以及磁 记录层，形成在所述第二底层上，并且包含至少一种Fe和Co元素以及至少一种Pt和Pd元素，并且包含具有L1 结构的磁性晶粒。 残留在第二底层的上表面上的氧量大于残留在第二底层的下表面上的氧量，并且磁记录层中磁性晶粒的（001）面的法线定向 相对于中等平面的法线为3〜25°的范围的倾斜角。