Patent ID: 8029651
Filing Date: 2011-10-04
Classification: C23C,G11B,H01F

Abstract:
1. A method of forming a magnetic layer for use in a magnetic recording medium in which a magnetic layer having a granular structure containing at least cobalt and chromium is formed on both sides of a substrate by reactive sputtering, which comprises: placing said substrate in a reaction container; arranging a pair of electrode units comprising sputtering electrodes and targets which are disposed on surfaces of the sputtering electrodes and which contain chromium other than the oxide thereof and cobalt oxide, so that the electrode units respectively face both sides of said substrate while said targets are on the substrate sides; feeding an argon-water mixture gas to vicinities of the respective surfaces on the substrate sides of said pair of electrode units; applying reactive sputtering so that the chromium other than the oxide thereof contained in said targets can be made into chromium oxide as a constituent to form the magnetic layer having the granular structure; and applying reactive sputtering so that the cobalt oxide contained in said targets can be made into cobalt as a constituent to form magnetic grains in the magnetic layer having the granular structure.