Patent number: 5236791
Abstract: A magnetic recording medium that uses, as a protective coating layer provided on a magnetic layer for magnetically recording signals, a layer made of a nonmagnetic material consisting of two ore more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, and B, or made of a magnetic material consisting of one or more elements of Co, Fe, Ni, and Gd, one or more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, B, and Si is excellent in sliding endurance. When the protective coating layer is made of the nonmagnetic material, the magnetic recording medium is also excellent in corrosion resistance, and when the protective coating layer is made of the magnetic material, the spacing between a magnetic head and the magnetic recording medium can advantageously be made large. Both the cases are high in reliability, and suitable for high density magnetic recording.
Type:
Grant
Filed:
August 28, 1989
Date of Patent:
August 17, 1993
Assignee:
Hitachi, Ltd.
Inventors:
Yotsuo Yahisa, Yoshihiro Shiroishi, Sadao Hishiyama, Tomoyuki Ohno, Shinichiro Saitoh, Suzuki Hiroyuki, Yoshibumi Matsuda, Norikazu Tsumita, Masaki Ohura, Noriyuki Shige, Kazumasa Takagi