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    • 41. 发明授权
    • Thermal-assist magnetic recording medium and magnetic recording and reproducing apparatus
    • 热辅助磁记录介质和磁记录和再现装置
    • US08705207B2
    • 2014-04-22
    • US12627719
    • 2009-11-30
    • Tetsuya KanbeYuzo SasakiAtsushi Hashimoto
    • Tetsuya KanbeYuzo SasakiAtsushi Hashimoto
    • G11B5/82
    • G11B5/66G11B5/65G11B5/82G11B2005/0021
    • 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.
    • 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。
    • 42. 发明授权
    • Manufacturing method of magnetic recording medium and magnetic recording/reproducing apparatus
    • 磁记录介质和磁记录/重放装置的制造方法
    • US08367155B2
    • 2013-02-05
    • US12693779
    • 2010-01-26
    • Atsushi HashimotoYuzo SasakiGohei Kurokawa
    • Atsushi HashimotoYuzo SasakiGohei Kurokawa
    • G11B5/127
    • G11B5/8404G11B5/667G11B5/82
    • There is provided a manufacturing method of a magnetic recording medium that maintains a high level of perpendicular orientation of a perpendicular magnetic layer and enables to further increase high recording density, prepared such that at least on a non-magnetic substrate, there are laminated a soft magnetic base layer, an orientation control layer 11 that controls the orientation of the layer immediately thereabove, and a perpendicular magnetic layer with a magnetization easy axis thereof primarily oriented perpendicular to the non-magnetic substrate. The manufacturing method is characterized in that when configuring the perpendicular magnetic layer with two or more magnetic layers 12 to 14 and crystal-growing each layer so that the crystal grains that constitute the respective magnetic layers 12 to 14, together with the crystal grains that constitute the orientation control layer 11, form column-shaped crystals S1 to S3 in a consecutive manner in the thickness direction, lamination of the orientation control layer 11 is performed while the substrate is being cooled or immediately after the substrate has been cooled.
    • 提供了一种磁记录介质的制造方法,其保持垂直磁性层的垂直取向的高水平,并且能够进一步提高高记录密度,其制备成至少在非磁性基板上层压软 磁性基层,控制其上方的层的取向的取向控制层11和其易磁化轴的垂直磁性层主要垂直于非磁性基板取向。 制造方法的特征在于,在构成具有2层以上的磁性层12〜14的垂直磁性层的情况下,使构成各磁性层12〜14的结晶粒与构成各磁性层12〜14的晶粒一起构成 取向控制层11在厚度方向上连续形成柱状晶体S1〜S3,在进行冷却或基板冷却后立即进行取向控制层11的层叠。
    • 47. 发明申请
    • MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS
    • 磁记录介质和磁记录和再现装置
    • US20110111257A1
    • 2011-05-12
    • US12674602
    • 2008-08-25
    • Gohei KurokawaYuzo SasakiTatsu KomatsudaAtsushi Hashimoto
    • Gohei KurokawaYuzo SasakiTatsu KomatsudaAtsushi Hashimoto
    • G11B5/33
    • G11B5/732G11B5/7325
    • 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.
    • 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。
    • 49. 发明申请
    • Method For Dividing Ceramic Cylindrical Body and Shape of Notched Portions Thereof
    • 陶瓷圆柱体的分割方法及其凹口部分的形状
    • US20080246178A1
    • 2008-10-09
    • US10570251
    • 2004-07-29
    • Atsushi Hashimoto
    • Atsushi Hashimoto
    • C04B41/80
    • F16J15/3488B28D5/0011F16J9/14
    • There are provided a method for dividing a ceramic cylindrical body, involving forming first and second notched portions in an inner periphery surface of the ceramic cylindrical body at positions confronting each other in the diametrical direction and subsequently applying a compressive load in the diametrical direction to divide the cylindrical body along the first and second notches, thereby making it possible to afford divided surfaces having such a concave and a convex as prevent axial displacement when re-joining divided sections, as well as a shape of the notched portions. Bisected cylindrical body portions can be joined together closely without axial displacement of the joined cylindrical body.
    • 提供了一种用于分割陶瓷圆筒体的方法,包括在陶瓷圆筒体的内周面上形成沿直径方向彼此面对的位置处的第一和第二切口部分,并且随后在直径方向上施加压缩载荷以分开 圆筒体沿着第一和第二凹口,从而可以提供具有这种凹凸的分割表面,以防止在重新连接分割部分时的轴向位移以及切口部分的形状。 可分离的圆柱形主体部分可以紧密连接在一起而不会使连接的圆柱体的轴向位移。