Birch, Stewart, Kolasch & Birch, LLP
Magnetic recording medium
The object of the present invention is to provide a magnetic recording medium, particularly, a tape for data backup, which is less in wear of head, small in output deterioration and high in recording density. According to the present invention, there is provided a magnetic recording medium comprising a non-magnetic support having on one side at least one non-magnetic undercoat layer and a magnetic layer in succession and on another side a back coat layer, in which the magnetic layer is an ultra-thin magnetic layer having a thickness of not more than 0.20 &mgr;m provided by adjusting a standard deviation of histogram obtained by measuring the surface roughness of the magnetic layer by a light interference surface roughness meter to not more than 0.56 nm.
Hitachi Maxell, Ltd.
G Y Y
G11B Y10T Y10T
inventional additional additional
Kenichiro Kimihiko
Yoshida Kaneno