公开(公告)号：US11250880B2

公开(公告)日：2022-02-15

申请号：US16627600

申请日：2018-04-13

申请人： Sony Corporation

发明人： Toshiaki Miura ,  Satoru Abe ,  Yuuko Kamoshita ,  Riku Yoshida

IPC分类号： G11B5/702 ,  G11B5/706 ,  G11B5/68 ,  G11B5/733 ,  G11B5/73

摘要： A magnetic recording medium includes: a substrate that is long in shape; and a magnetic layer containing magnetic powder and a binder. The glass transition point of the binder is not lower than 75° C. In a case where atomic force microscope observation images in a 10 μm×10 μm rectangular shape are acquired at five locations randomly selected from the surface on the side of the magnetic layer, any linear protrusion that is 3 nm to 20 nm in height, is 0.3 μm to 1.0 μm in width, and extends across two sides of the observation image does not exist in the observation images of four locations among the acquired observation images of the five locations.