| 摘要 |
PURPOSE:To improve the corrosion resistance of a magnetic recording medium and to provide the large coercive force necessary for the higher density recording and the quantity of magnetization which can deal with the reduction in film thickness by forming the magnetic layer of the magnetic recording medium of a Co alloy contg. Co, Ni, Cr, and Fe. CONSTITUTION:An Ni-P alloy layer is formed as a nonmagnetic substrate layer 2 on a nonmagnetic substrate 1 consisting of an Al-Mg alloy plate, etc., and is finished to a specular surface. A nonmagnetic metallic underlying layer 3 consisting of Cr is formed by sputtering on the nonmagnetic substrate 2. The underlying layer 3 consisting of the Cr increases the crystal magnetic anisotropy in the horizontal direction of the magnetic layer 4 formed thereon by the crystal orientational property thereof and improves the coercive force. A thin film of a Co-Ni alloy contg. Cr and Fe is formed by sputtering as the magnetic layer 4 on the nonmagnetic metallic underlying layer 3. The magnetic characteristics and corrosion resistance are improved by such magnetic layer 4 to a greater extent. A protective lubricating layer 5 is formed on the magnetic layer 4 in order to improve the lubricity with a magnetic head and to improve the wear resistance. |
