| 摘要 |
PURPOSE:To obtain a magnetic recording medium which has an axis of easy magnetization in the vertical direction of a magnetic field and superior magnetic characteristics of residual magnetism and coercive force by forming a continuous magnetic film principally of iron oxide as the magnetic film, and setting the ratio Mv/Mh of residual magnetism Mh in the in-face direction of the magnetic film and residual magnetism Mv in the vertical direction above a specific value. CONSTITUTION:The magnetic moment of the medium rises vertically at about 30 deg. from a film surface to obtain an effect on vertical magnetic recording when the ratio (Mv/Mh) of the residual magnetism (Mh) in the in-face direction of the magnetic film and residual magnetism (Mv) before the effect of a diamagnetic field originating from the vertical shape of the magnetic film is corrected is >=0.5. Preferably, Mv/Mh>1. When a magnetic material is adhered onto a base body, a method of scattering atoms constituting the magnetic film in a vacuum chamber, etc., are employed. In a figure, 1 is the vacuum chamber, 2 is an evacuation system consisting of a vacuum pump, etc., which evacuates the vacuum chamber, and 3 is a gas introduction system which admits specific gas into the vacuum chamber and sets the gas pressure to about 10<-1>-10<-4>Torr. |
