MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To improve magnetic characteristics of a magnetic recording medium for a vertical magnetic recording system by a method wherein the 1st magnetic material thin film formed on a surface of a supporting material is composed of a Co-Hf-W 3-component amorhpous alloy. CONSTITUTION:The 1st magnetic material thin film 2 is formed on a surface of a supporting material 1 made of a synthetic resin such as polyester or a polyimide or an anode-oxidized aluminum plate or the like by sputtering of a Co- Hf-W 3-pomponent amorphous alloy which contains 1-5 atomic % of Hf and 5-12 atomic % of W. Then the 2nd magnetic material thin film 3 is formed on the surface of the 1st magnetic material thin film 2 by sputting of a Co-Cr 2- component alloy which contains cobalt as a main component and a small amount of crome. The amorphous alloy of the 1st magnetic material thin film thus formed has a low coercive force and a permeability and high saturate flux density and an excellent magnetic anisotropy. Therefore, a magnetic recording medium with excellent recording and regenerating characteristics can be obtained and the 2nd magnetic material thin film can be made as thin as possible.