Magnetic disk

Abstract

Abstract PURPOSE:To obtain high output and high S/N ratio of the disk by providing a magnetic film having an easily magnetizable axis in the circumferential direction, magnetic anisotropy energy between >=3X10<5> erg/cc to <=2X10<6> erg/cc and coercivity between >=1000 Oe and <=1500 Oe. CONSTITUTION:An Al-Mg alloy substrate is subjected to texturing treatment with a common tape polisher to form a textured substrate having fine grooves in the circumferential direction on its surface. This substrate is coaxially faced to a sputtering target and treated by a magnetron-sputtering method at a static and opposite position to form successively and continuously a Cf base film, the magnetic film of Co62.5Ni30Cr7.5, and a carbon protective film. By this method, such a magnetic film can be obtained that has an easily magnetized axis in the circumferential direction of the disk, the magnetic anisotropy energy between >=3X10<5> erg/cc to <=2X10<6> erg/cc and coercivity between >=1000 Oe to <=1500 Oe. Thereby, high S/N ratio and high output can be realized.

Inventors

• 👤 Fuminori Higami
• 👤 樋上　文範
• 👤 Toshiyasu Beppu
• 👤 別府　敏保

Bibliographic Details