| 摘要 |
<p>A rare earth-iron-boron magnetic powder comprising a rare earth element, iron and boron, which has a coercive force of 80 to 400 kA/m, a saturation magnetization of 10 to 25 mu W/g, an average particle size of 5 to 200 nm, and a particulate or ellipsoidal particle shape, and a magnetic recording medium having a magnetic layer which contains this magnetic powder and a binder. The magnetic recording medium firstly makes it possible to practically use the very thin magnetic layer of 0.3 mu m or less, which cannot be realized by the coating type magnetic recording media using the conventional acicular magnetic powder. <IMAGE></p> |
