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    • 12. 发明申请
    • PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH GRAIN BOUNDARY CONTROLLING LAYERS
    • 具有颗粒边界控制层的全磁性记录介质
    • US20130155542A1
    • 2013-06-20
    • US13326213
    • 2011-12-14
    • Shun TonookaKiwamu TanahashiHiroyuki NakagawaIchiro Tamai
    • Shun TonookaKiwamu TanahashiHiroyuki NakagawaIchiro Tamai
    • G11B21/02G11B5/851G11B5/66
    • G11B5/66G11B5/65G11B5/84G11B5/851
    • In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.
    • 在一个实施例中,垂直磁记录介质包括氧化物记录层,该氧化物记录层包括不包含位于氧化物记录层上方的氧化物的氧化物和非氧化物记录层。 氧化物记录层包括区域R1,其中平行于R1的形成平面的方向上的晶界宽度从氧化物记录层的最下部朝向介质表面增加,位于R1上方的区域R3,其中晶界 宽度随着介质表面的增加而增加,其中R2的晶界宽度从R1向R3延伸的区域R2,R2位于R1和R3之间,R4的晶界宽度从R3向R3的边界宽度减小 中间表面,其中R4位于R3上方并且靠近氧化物记录层的最上部。