公开(公告)号：US20110111257A1

公开(公告)日：2011-05-12

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： G11B5/33

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：US20100182714A1

公开(公告)日：2010-07-22

申请号：US12627719

申请日：2009-11-30

申请人： Tetsuya KANBE ,  Yuzo Sasaki ,  Atsushi Hashimoto

发明人： Tetsuya KANBE ,  Yuzo Sasaki ,  Atsushi Hashimoto

IPC分类号： G11B5/02 ,  G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/82 ,  G11B2005/0021

摘要： A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.

摘要翻译： 提供能够实现1Tbit / inch2的表面记录密度的热辅助磁记录介质。 热辅助磁记录介质包括：基板; 形成在所述基板上的多个下层; 形成在下层上的第一磁性层; 形成在第一磁性层上并由铁磁性合金形成的耦合控制层; 以及形成在耦合控制层上的第二磁性层。 这里，第一磁性层和第二磁性层的居里温度高于耦合控制层的居里温度，第一磁性层的各向异性磁场大于第二磁性层的各向异性磁场， 饱和磁场在350℃以下的温度下具有最小值。

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。