公开(公告)号：US08034471B2

公开(公告)日：2011-10-11

申请号：US12536225

申请日：2009-08-05

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

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

IPC分类号： G11B5/66

CPC分类号： G11B5/82 ,  G11B5/65 ,  G11B5/667 ,  G11B5/732

摘要： In a perpendicular magnetic recording medium in which at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer and a protective layer are formed on a non-magnetic substrate in order from the bottom, the orientation control layer has a laminated structure of two or more layers including an intermediate layer and a seed layer which is disposed closer to the non-magnetic substrate than the intermediate layer. The seed layer includes two or more kinds of elements having a face-centered cubic structure, has face-centered cubic (111) plane crystals oriented in a direction perpendicular to a substrate surface, and has a pseudo-hexagonal structure.

摘要翻译： 在从底部起依次形成至少软磁性底层，取向控制层，磁记录层和保护层的垂直磁记录介质中，取向控制层具有层叠结构 包括比中间层更靠近非磁性基板设置的中间层和种子层的两层以上的层。 种子层包括具有面心立方结构的两种或更多种元件，具有在垂直于衬底表面的方向上取向的面心立方（111）面晶体，并且具有假六边形结构。

公开(公告)号：US20100209741A1

公开(公告)日：2010-08-19

申请号：US12670815

申请日：2008-07-25

申请人： Yuzo Sasaki ,  Atsushi Hashimoto

发明人： Yuzo Sasaki ,  Atsushi Hashimoto

IPC分类号： G11B5/706 ,  C23C14/34

CPC分类号： G11B5/65 ,  G11B5/66

摘要： A perpendicular magnetic recording medium is provided, which has a soft magnetic layer, an under layer, an intermediate layer and a perpendicular magnetic recording layer, and is characterized in that the perpendicular magnetic recording layer is comprised of at least one magnetic layer, which magnetic layer or at least one of which magnetic layers comprises cobalt-based ferromagnetic crystal grains and grain boundaries comprised of an oxide, wherein the ferromagnetic crystal grains further comprise ruthenium. The perpendicular magnetic recording medium has ferromagnetic crystal grains with extremely small grain size and exhibiting enhanced discretion, as well as good perpendicular orientation in the perpendicular magnetic recording layer, and thus, the medium is capable of recording and reproducing information with high density.

摘要翻译： 提供一种具有软磁层，下层，中间层和垂直磁记录层的垂直磁记录介质，其特征在于垂直磁记录层由至少一个磁性层组成，该磁性层 层或其中至少一个磁性层包括钴基铁磁晶粒和由氧化物组成的晶界，其中铁磁晶粒还包含钌。 垂直磁记录介质具有极小的晶粒尺寸的铁磁晶粒，并且在垂直磁记录层中表现出增强的判断力以及良好的垂直取向，因此该介质能够高密度地记录和再现信息。

公开(公告)号：US20100165510A1

公开(公告)日：2010-07-01

申请号：US12601372

申请日：2008-05-21

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： G11B5/82

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/66 ,  G11B5/7379

摘要： A magnetic recording medium comprising a substrate, at least one soft magnetic underlayer formed on the substrate, a perpendicular magnetic recording layer formed on the soft magnetic underlayer, and a protective layer formed on the perpendicular magnetic recording layer, is provided wherein the perpendicular magnetic recording layer is comprised of a primary recording layer, a non-magnetic intermediate layer and an auxiliary layer; the primary recording layer comprises magnetic crystal grains and grain boundary portions surrounding the magnetic crystal grains, and has a perpendicular magnetic anisotropy; the auxiliary layer has a negative magneto crystalline anisotropy; and the non-magnetic intermediate layer is formed between the primary recording layer and the auxiliary layer and comprises at least one metal selected from Ru, Rh and Ir, or at least one alloy thereof. This magnetic recording medium exhibits high heat resistance and good recording/reproducing characteristics, and enables a high recording density.

摘要翻译： 一种磁记录介质，其特征在于，包括基板，形成在基板上的至少一个软磁性底层，形成在软磁性底层上的垂直磁记录层和形成在垂直磁记录层上的保护层，其中垂直磁记录 层由主记录层，非磁性中间层和辅助层构成; 主记录层包括磁晶粒和围绕磁晶粒的晶界部分，并且具有垂直的磁各向异性; 辅助层具有负磁结晶各向异性; 并且非磁性中间层形成在初级记录层和辅助层之间，并且包含至少一种选自Ru，Rh和Ir的金属，或其至少一种合金。 该磁记录介质具有高的耐热性和良好的记录/再现特性，并且能够实现高的记录密度。

公开(公告)号：US20090147401A1

公开(公告)日：2009-06-11

申请号：US12300073

申请日：2007-05-05

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： G11B5/127 ,  G11B5/33

CPC分类号： G11B5/667 ,  G11B5/7325

摘要： The present invention provides a magnetic recording medium capable of recording or reproducing high-density information by reducing the grain size of a perpendicular magnetic recording layer and improving vertical orientation, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. The perpendicular magnetic recording medium includes: a non-magnetic substrate; and at least an soft magnetic layer, an under layer, an intermediate layer, and a perpendicular magnetic recording film that are formed on the non-magnetic substrate. At least one layer of the intermediate layer is made of an alloy material of an element having an fcc structure and an element having a bcc structure or an hcp structure, and has both a crystal structure having (111) orientation and an irregular layer lattice (stacking fault) caused by a mixture of the fcc structure and the bcc structure. The at least one layer of the intermediate layer is made of an alloy material of at least one element that is selected from a group composed of Pt, Ir, Pd, Au, Ni, and Co, which is a main ingredient, and has the fcc structure, and an element having the bcc structure or the hcp structure.

摘要翻译： 本发明提供一种能够通过减小垂直磁记录层的晶粒尺寸并提高垂直取向来记录或再现高密度信息的磁记录介质，其制造方法和磁记录/再现装置。 垂直磁记录介质包括：非磁性基板; 以及形成在非磁性基板上的至少软磁性层，下层，中间层和垂直磁记录膜。 中间层的至少一层由具有fcc结构的元素和具有bcc结构或hcp结构的元素的合金材料制成，并且具有具有（111）取向的晶体结构和不规则层晶格（ 堆叠故障）由fcc结构和bcc结构的混合引起。 中间层的至少一层由选自由作为主要成分的Pt，Ir，Pd，Au，Ni和Co组成的组中的至少一种元素的合金材料制成，并且具有 fcc结构，以及具有bcc结构或hcp结构的元素。

公开(公告)号：US08968526B2

公开(公告)日：2015-03-03

申请号：US12692354

申请日：2010-01-22

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

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

IPC分类号： C23C14/34 ,  G11B5/851 ,  C23C14/14 ,  G11B5/65 ,  G11B5/82

CPC分类号： G11B5/851 ,  C23C14/14 ,  C23C14/34 ,  G11B5/65 ,  G11B5/82 ,  Y02T50/67

摘要： There are provided a method for manufacturing a magnetic recording medium which is excellent in terms of both the recording and reproduction characteristics and the thermal fluctuation characteristics without reducing the density and hardness of the perpendicular magnetic layer; a magnetic recording medium; and a magnetic recording and reproducing apparatus with which an excellent recording density is achieved, wherein, in the method for manufacturing the magnetic recording medium, at least a portion of the perpendicular magnetic layer 4 is formed as a magnetic layer having a granular structure that contains Co as a major component and also contains an oxide of at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg; a target for forming the perpendicular magnetic layer 4 by the sputtering process is prepared so as to include an oxide of Co and a compound of Co and at least one nonmagnetic metal selected from the group consisting of Cr, Si, Ta, Al, Ti, W and Mg, and to make the proportion of oxygen contained in the target higher than the proportion of oxygen contained in the perpendicular magnetic layer 4; and a sputtering gas pressure at the time of forming the perpendicular magnetic layer is set to 1 Pa or less.

摘要翻译： 提供了一种在不降低垂直磁性层的密度和硬度的情况下，在记录和再现特性以及热波动特性方面优异的磁记录介质的制造方法; 磁记录介质; 以及实现了良好的记录密度的磁记录和重放装置，其中在磁记录介质的制造方法中，垂直磁性层4的至少一部分形成为具有粒状结构的磁性层， Co作为主要成分，还含有选自Cr，Si，Ta，Al，Ti，W和Mg中的至少一种非磁性金属的氧化物; 制备通过溅射法形成垂直磁性层4的目标，以便包括Co的氧化物和Co的化合物和选自Cr，Si，Ta，Al，Ti的至少一种非磁性金属， W和Mg，并使靶中含有的氧的比例高于垂直磁性层4中所含的氧的比例; 在形成垂直磁性层时的溅射气体压力设定为1Pa以下。

公开(公告)号：US08529989B2

公开(公告)日：2013-09-10

申请号：US12681270

申请日：2008-10-02

申请人： Gohei Kurokawa ,  Yuzo Sasaki

发明人： Gohei Kurokawa ,  Yuzo Sasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/84

摘要： The present invention relates to a method for manufacturing a perpendicular magnetic recording medium including a nonmagnetic substrate, and at least a soft magnetic under layer, an orientation control layer, a magnetic recording layer constituted of two or more layers and a protective layer formed on the nonmagnetic substrate, the method including a step of forming a first magnetic recording layer having a granular structure constituted of ferromagnetic crystal grains and crystal grain boundaries made of a nonmagnetic oxide or nitride on the nonmagnetic substrate side, a step of forming a second magnetic recording layer constituted only of ferromagnetic crystal grains, a step of forming a surface unevenness control layer for decreasing surface unevenness of the first magnetic recording layer located between the first magnetic recording layer and the second magnetic recording layer, and a step of heating the nonmagnetic substrate so as to decrease a surface roughness Ra of the second magnetic recording layer to less than 2 nm. The present invention also relates to a magnetic recording and reproducing apparatus using the magnetic recording medium.

摘要翻译： 本发明涉及一种用于制造包括非磁性基板的垂直磁记录介质的方法，至少包括软磁下层，取向控制层，由两层或多层构成的磁记录层和形成在其上的保护层 非磁性基板，该方法包括在非磁性基板侧上形成具有由铁磁性晶粒构成的粒状结构和由非磁性氧化物或氮化物构成的晶粒边界的第一磁记录层的步骤，形成第二磁记录层 仅由铁磁性晶粒构成的步骤，形成用于减小位于第一磁记录层和第二磁记录层之间的第一磁记录层的表面凹凸的表面凹凸控制层的步骤，以及加热非磁性基板的步骤，以便 以减小第二m的表面粗糙度Ra agnetic记录层到小于2nm。 本发明还涉及使用该磁记录介质的磁记录和重放装置。

公开(公告)号：US08247094B2

公开(公告)日：2012-08-21

申请号：US12681061

申请日：2008-10-02

申请人： Yuzo Sasaki

发明人： Yuzo Sasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/66

摘要： The present invention relates to a perpendicular magnetic recording medium including a nonmagnetic substrate, and at least a soft magnetic layer (SUL), an alignment control layer, a magnetic recording layer and a protective layer formed on the nonmagnetic substrate; wherein the magnetic recording layer is constituted of three or more layers and includes a first magnetic recording layer, a second magnetic recording layer and a third magnetic recording layer from the substrate side, and also includes an exchange coupling reduction layer for reducing exchange coupling of both layers between the second magnetic recording layer and the third magnetic recording layer and, regarding magnetocrystalline anisotropic energy Ku of each magnetic recording layer, the first magnetic recording layer has 4×106 erg/cc or higher, the second magnetic recording layer has 2×106 erg/cc or lower and the third magnetic recording layer has 1×106 erg/cc or lower. The present invention also relates to a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium.

摘要翻译： 本发明涉及一种包括非磁性基板的垂直磁记录介质，以及形成在非磁性基板上的至少软磁性层（SUL），取向控制层，磁记录层和保护层。 其中所述磁记录层由三层或更多层构成，并且包括从所述衬底侧的第一磁记录层，第二磁记录层和第三磁记录层，并且还包括用于减少两者的交换耦合的交换耦合减少层 第二磁记录层和第三磁记录层之间的层，并且关于每个磁记录层的磁晶各向异性Ku，第一磁记录层具有4×106erg / cc或更高，第二磁记录层具有2×106 erg / cc以下，第三磁记录层为1×106erg / cc以下。 本发明还涉及使用垂直磁记录介质的磁记录和重放装置。

公开(公告)号：US08133601B2

公开(公告)日：2012-03-13

申请号：US12674602

申请日：2008-08-25

申请人： Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto

发明人： Gohei Kurokawa ,  Yuzo Sasaki ,  Tatsu Komatsuda ,  Atsushi Hashimoto

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/7325

摘要： A magnetic recording medium is provided which can record and reproduce high-density information by maintaining perpendicular orientation of a magnetic recording layer even with a decrease in thickness of nonmagnetic layers from an intermediate layer to a seed layer while decreasing the grain size of magnetic crystal grains to be consistent with an increase in recording density. A manufacturing method thereof and a magnetic recording and reproducing apparatus are also provided. The magnetic recording medium is a perpendicular magnetic recording medium including at least an underlying layer, an orientation control layer, a magnetic recording layer, and a protective layer formed on a nonmagnetic substrate. Here, the orientation control layer includes two or more layers of a seed layer and an intermediate layer from the substrate side. Materials of the seed layer and the intermediate layer are selected so that a contact angle of the intermediate layer material with respect to the seed layer material, which is amorphous, is in the range of 10 to 100 degrees.

摘要翻译： 提供了一种磁记录介质，其可以通过保持磁记录层的垂直取向来记录和再现高密度信息，即使随着磁性晶粒的晶粒尺寸的减小，非磁性层从中间层到种晶层的厚度减小 与记录密度的增加一致。 还提供了其制造方法和磁记录和再现装置。 磁记录介质是至少包括下层，取向控制层，磁记录层和形成在非磁性基板上的保护层的垂直磁记录介质。 这里，取向控制层包括两层以上的种子层和从基板侧的中间层。 选择种子层和中间层的材料，使得中间层材料相对于无定形的种子层材料的接触角在10至100度的范围内。

公开(公告)号：US08034472B2

公开(公告)日：2011-10-11

申请号：US12542372

申请日：2009-08-17

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

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

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  B82Y25/00 ,  B82Y40/00 ,  G11B5/65 ,  G11B5/667 ,  H01F10/3272 ,  H01F41/306

摘要： The present invention provides a magnetic recording medium which is capable of improving the perpendicular orientation of a perpendicular magnetic recording layer while maintaining a writing performance during recording and obtaining both an improvement in the perpendicular orientation and fine magnetic crystal particles with a uniform diameter, and which enables information to be recorded or reproduced at high density, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. A magnetic recording medium 10 according to the present invention includes at least a soft magnetic underlayer 2, an orientation control layer 3, a magnetic recording layer 4, and a protective layer 5 formed on a non-magnetic substrate 1. The orientation control layer 3 has a seed layer 6 and an intermediate layer 7. The seed layer 6 is made of a Cu—Ti alloy that has a face-centered cubic structure and includes Cu as a main component. The Cu—Ti alloy has a (111) crystal plane oriented substantially perpendicular to the surface of the non-magnetic substrate 1 and has a pseudo-hexagonal structure.

摘要翻译： 本发明提供一种磁记录介质，其能够在记录期间保持写入性能并且获得具有均匀直径的垂直取向和精细磁性结晶颗粒的改善的同时改善垂直磁记录层的垂直取向，并且其中 能够以高密度记录或再现信息，其制造方法和磁记录/再现装置。 根据本发明的磁记录介质10至少包括形成在非磁性基板1上的软磁性底层2，取向控制层3，磁记录层4和保护层5.取向控制层3 具有种子层6和中间层7.种子层6由具有面心立方结构并且包括Cu作为主要成分的Cu-Ti合金制成。 Cu-Ti合金具有大致垂直于非磁性基板1的表面定向的（111）晶面，并且具有假六边形结构。

公开(公告)号：US20100247962A1

公开(公告)日：2010-09-30

申请号：US12681061

申请日：2008-10-02

申请人： Yuzo Sasaki

发明人： Yuzo Sasaki

IPC分类号： G11B5/33

CPC分类号： G11B5/66

摘要： The present invention relates to a perpendicular magnetic recording medium including a nonmagnetic substrate, and at least a soft magnetic layer (SUL), an alignment control layer, a magnetic recording layer and a protective layer formed on the nonmagnetic substrate; wherein the magnetic recording layer is constituted of three or more layers and includes a first magnetic recording layer, a second magnetic recording layer and a third magnetic recording layer from the substrate side, and also includes an exchange coupling reduction layer for reducing exchange coupling of both layers between the second magnetic recording layer and the third magnetic recording layer and, regarding magnetocrystalline anisotropic energy Ku of each magnetic recording layer, the first magnetic recording layer has 4×106 erg/cc or higher, the second magnetic recording layer has 2×106 erg/cc or lower and the third magnetic recording layer has 1×106 erg/cc or lower. The present invention also relates to a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium.

摘要翻译： 本发明涉及一种包括非磁性基板的垂直磁记录介质，以及形成在非磁性基板上的至少软磁性层（SUL），取向控制层，磁记录层和保护层。 其中所述磁记录层由三层或更多层构成，并且包括从所述衬底侧的第一磁记录层，第二磁记录层和第三磁记录层，并且还包括用于减少两者的交换耦合的交换耦合减少层 第二磁记录层和第三磁记录层之间的层，并且关于每个磁记录层的磁晶各向异性Ku，第一磁记录层具有4×106erg / cc或更高，第二磁记录层具有2×106 erg / cc以下，第三磁记录层为1×106erg / cc以下。 本发明还涉及使用垂直磁记录介质的磁记录和重放装置。