| 摘要 |
PURPOSE:To obtain a magnetic recording medium which is suitable for vertical magnetic recording at a high density, has excellent mechanical strength and chemical stability and has a large SN ratio by forming a magnetic layer of a continuous magnetic layer consisting essentially of an iron oxide having a prescribed characteristic. CONSTITUTION:A magnetic field perpendicular to the surface of targets T1, T2 in a vacuum vessel 1 of a sputtering device is formed to form plasma of a high density between the targets T1 and T2, thus forming a continuous magnetic layer 10 on a substrate 6. Fe (contg. 1 atom% Co) is used for the target material and Ar+O2 for the gas to be introduced to form a magnetic layer 10 having >=0.5% the ratio of the residual magnetization in the direction perpendicular to the plane of the layer 10 with respect to the residual magnetization in the direction within the plane of said layer and 0.2mum<R<=2mum surface roughness R. The magnetic layer which is suitable for vertical magnetic recording at a high density, has excellent mechanical strength and chemical stability, etc. and has good running property and a large SN ratio is thus obtd. |
