公开(公告)号：US06509108B2

公开(公告)日：2003-01-21

申请号：US09812187

申请日：2001-03-19

申请人： Chiaki Okuyama ,  Yuki Yoshida ,  Kenji Sato ,  Kiyoshi Yamaguchi ,  Yoshita Kitamoto

发明人： Chiaki Okuyama ,  Yuki Yoshida ,  Kenji Sato ,  Kiyoshi Yamaguchi ,  Yoshita Kitamoto

IPC分类号： G11B5738

CPC分类号： G11B5/7315 ,  Y10T428/12833 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/12944 ,  Y10T428/24355 ,  Y10T428/24479 ,  Y10T428/24537 ,  Y10T428/265 ,  Y10T428/31

摘要： A magnetic recording medium has a nonmagnetic substrate having applied thereon through a nonmagnetic underlayer a magnetic recording layer composed of a magnetic metal material. The nonmagnetic substrate has a smooth surface with an average surface roughness Ra of not more than 20 Å, a recesses-and protrusions-forming layer having stripe-like protrusions and recesses in the circumferential direction, formed on the substrate. A CrP or CrMoP reinforcing coat layer having a hardness higher than that of the recesses-and protrusions-forming layer is sandwiched between the substrate and the recesses-and-protrusions-forming layer.

摘要翻译： 磁记录介质具有通过非磁性底层涂覆有由磁性金属材料构成的磁记录层的非磁性基底。 非磁性基板具有平坦表面粗糙度Ra不大于20μm的平滑表面，在基板上形成有在圆周方向上具有条状突起和凹陷的凹凸形成层。 具有高于凹凸形成层的硬度的CrP或CrMoP增强涂层夹在基板和凹凸形成层之间。