MAGNETISCHES AUFNAHMEMEDIUM.

摘要

This improved magnetic recording medium comprises a non-magnetisable substrate on which a magnetisable layer (1) is formed. (1) is composed of (a) one or more than one rare earth element chosen from Y, La, Ce, Pr, Nd, Sm, Gd, Tb and Dy(upto 13 wt.%), (b) oxygen (3-13 wt.%), and (c) Co and unavoidable impurities (the remaining wt.%). It may also contain, if necessary Ni (up to 22 wt.%). The unavoidable impurities are at least one of B, C, Al, Si, Sn, S, Cu, Zn, Fe, Ti, Cr. They must be present to less than 1 wt.%. The thickness of (1) is 0.1-1.0 microns. The non-magnetizable substrate is polyester, acetate, polycarbonate, glass or Al. Its thickness is 5-25 microns. (1) is formed by a spattering, ion-plating or vaccum-evapn. method after the surface of the substrate is treated with primer or by a carbon discharge.