Birch, Stewart, Kolasch and Birch
Magnetic recording medium
 A magnetic medium in which the non-magnetic layer comprises nickel-copper-phosphorus film containing 20 to 65 wt % of copper, in which layer is formed by electroless plating. The non-magnetic layer does not become magnetic even after heat treatment at 200.degree. C. or above. 
C. Uyemura and Co.
Y Y Y G Y Y
Y10S Y10T Y10T G11B Y10T Y10S
additional additional additional inventional additional additional
Akira Masahiro
Nakabayashi Saito