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    • 31. 发明申请
    • PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS
    • 全磁记录介质和磁记录和再现设备
    • US20100246060A1
    • 2010-09-30
    • US12678086
    • 2008-09-30
    • Yuzo Sasaki
    • Yuzo Sasaki
    • G11B5/127G11B5/33
    • G11B5/66G11B5/65
    • 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 two or more layers and includes a first magnetic recording layer and a second magnetic recording layer from the nonmagnetic substrate side and, regarding magnetocrystalline anisotropic energy Ku of each magnetic recording layer, the first magnetic recording layer has 4×106 erg/cc or higher and the second magnetic recording layer has 2×106 erg/cc or lower, wherein the first magnetic recording layer is constituted of CoCrPtRu magnetic alloy crystal grains and grain boundaries made of an oxide and the area of grain boundaries is 30% or more based on the entire area in a planar TEM observation of the first magnetic recording layer. The present invention also relates to a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium.
    • 本发明涉及一种包括非磁性基板的垂直磁记录介质,以及至少形成在非磁性基板上的软磁层(SUL),取向控制层,磁记录层和保护层,其中磁记录层 由两层或更多层组成,并且包括来自非磁性衬底侧的第一磁记录层和第二磁记录层,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4×10 6赫/ 以上,第二磁记录层为2×106erg / cc以下,其中,第一磁记录层由CoCrPtRu磁性合金晶粒和由氧化物构成的晶界构成,晶界面积为30%以上 基于第一磁记录层的平面TEM观察中的整个区域。 本发明还涉及使用垂直磁记录介质的磁记录和重放装置。
    • 32. 发明授权
    • Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus
    • 垂直磁记录介质和磁记录和再现装置
    • US08367229B2
    • 2013-02-05
    • US12678086
    • 2008-09-30
    • Yuzo Sasaki
    • Yuzo Sasaki
    • G11B5/66
    • G11B5/66G11B5/65
    • 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 two or more layers and includes a first magnetic recording layer and a second magnetic recording layer from the nonmagnetic substrate side and, regarding magnetocrystalline anisotropic energy Ku of each magnetic recording layer, the first magnetic recording layer has 4×106 erg/cc or higher and the second magnetic recording layer has 2×106 erg/cc or lower, wherein the first magnetic recording layer is constituted of CoCrPtRu magnetic alloy crystal grains and grain boundaries made of an oxide and the area of grain boundaries is 30% or more based on the entire area in a planar TEM observation of the first magnetic recording layer. The present invention also relates to a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium.
    • 本发明涉及一种包括非磁性基板的垂直磁记录介质,以及至少形成在非磁性基板上的软磁层(SUL),取向控制层,磁记录层和保护层,其中磁记录层 由两层或更多层组成,并且包括来自非磁性衬底侧的第一磁记录层和第二磁记录层,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4×10 6赫/ 以上,第二磁记录层为2×106erg / cc以下,其中,第一磁记录层由CoCrPtRu磁性合金晶粒和由氧化物构成的晶界构成,晶界面积为30%以上 基于第一磁记录层的平面TEM观察中的整个区域。 本发明还涉及使用垂直磁记录介质的磁记录和重放装置。