Patent ID: 7273667
Filing Date: 2007-09-25
Classification: G11B,Y10T

Abstract:
1. A magnetic recording medium, comprising: an underlayer, a first magnetic layer, a first intermediate layer, a second magnetic layer, a second intermediate layer, a third magnetic layer, a protection layer and a lubrication layer, which are formed above a substrate; and each of the third magnetic layer and the second magnetic layer comprises a cobalt-based alloy containing at least platinum and chromium, a concentration of platinum contained in the second magnetic layer is not more than that in the third magnetic layer, platinum contained in the third magnetic layer is 15 at % or less, a concentration of chromium contained in the third magnetic layer is 15 at % or more and 18 at % or less, and a concentration of boron contained in the third magnetic layer is 7 at % or more and 10 at % or less.