MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To obtain a magnetic recording medium having superior magnetic characteristics by using a ternary amorphous Co alloy contg. Zr and Ta as the material of the 1st magnetic thin film of a vertical magnetic recording medium to improve the affinity of the film for the 2nd magnetic layer of a Co-Cr alloy. CONSTITUTION:A ternary amorphous Co alloy contg. about 5-20wt% in total of >=about 2.5wt% Zr and Ta or a quaternary amorphous Co alloy obtd. by substituting Nb for part of TA in the ternary alloy is deposited on a substrate 1 by sputtering or other method to form the 1st magnetic layer 2. A thin film of a Co-Cr alloy is then formed on the layer 2 as the 2nd magnetic layer 3. The layer 2 has high magnetic permeability and high saturation magnetic flux density, and the vertical anisotropy of the layer 3 is sufficiently shown, so a magnetic recording medium having superior recording and reproducing characteristics is obtd.