Yamaha Corporation

Nippon Gakki Seizo Kabushiki Kaisha

Yoshifumi Suzuki

Yukio Wakui

Tadao Tokushima

Toshiro Takahashi

Makoto Shiraki

In construction of a magnetic recording material having overlaid anodic oxide layers and well suited for perpendicular magnetic recording, a substrate is made of a hard material and Al predominant layers of 0.1 to 2 .mu.m thickness and formed on the substrate as a base for the overlaid anodic oxide layers for improvement in mechanical properties with acceptable magnetic recording characteristics.

Magnetic recording material

In production of magnetic recording media by anode oxidation of an Al predominant substrate, deposition of ferromagnetic substance in substrate pores and final grinding, use of a substrate having a surface K-value of 0.5 or larger enables easy production of media with surface roughness well suited for ideal high density magnetic recording. The K-value is the ratio of X-ray reflection intensity of the crystal plane S(1,1,1) and the toal X-ray reflection intensity of all crystal planes.

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Hamamatsu, Japan

Yoshifumi Suzuki