摘要 |
<p>A magnetic recording medium having a high normalized coercive force of a ferromagnetic metal layer and excellent S/N ratio and adaptable to high density recording. The magnetic recording medium comprises a substrate and a Co-based ferromagnetic metal layer formed thereon via a metallic underlying layer. The oxygen concentrations in the metallic underlying layer and in the ferromagnetic metal layer are not larger that 100 wt. ppm. Magnetic inversion is used for the recording. The value of 4πMs/Hkgrain is smaller than 1, where Ms is the saturation magnetization of the ferromagnetic metal layer and H¿k?grain is the anisotropic magnetic field of the individual crystalline particles. It is preferable that the size of the individual crystalline particles constituting the ferromagnetic metal layer is not larger than 10 nm.</p> |