公开(公告)号：US20140044992A1

公开(公告)日：2014-02-13

申请号：US14051414

申请日：2013-10-10

Applicant: WD Media (Singapore) Pte. Ltd.

Inventor： Takahiro ONOUE

IPC: G11B5/85 ,  G11B5/66

CPC classification number: G11B5/85 ,  G11B5/65 ,  G11B5/66

Abstract: A perpendicular magnetic recording medium 100 having a magnetic recording layer 122, wherein a particle diameter of crystal grains in layer 122 improves a SNR while a high coercive force is maintained. There also is at least a ground layer 118, a first magnetic recording layer 122a, and a second magnetic recording layer 122b in this order on a disk base 110. The first layer 122a and the second layer 122b are ferromagnetic layers, each having a granular structure in which a grain boundary part made of a non-magnetic substance is formed between crystal grains each grown in a columnar shape, and A

Abstract translation: 具有磁记录层122的垂直磁记录介质100，其中层122中的晶粒的粒径提高SNR，同时保持高的矫顽力。 在盘基座110上依次还有至少一个接地层118，第一磁记录层122a和第二磁记录层122b。第一层122a和第二层122b是铁磁性层，每层具有颗粒状 其中在以柱状形成的晶粒之间形成由非磁性物质制成的晶界部分的结构，并且当第一磁记录层122a中的晶粒的平均粒径为A时，A