Patent ID: 7261958
Filing Date: 2007-08-28
Classification: G11B

Abstract:
1. A magnetic recording medium comprising: a substrate; an underlayer formed over said substrate and a magnetic recording layer formed directly on said underlayer, having a first magnetic layer, a non-magnetic intermediate layer directly formed on the first magnetic layer, and a second magnetic layer directly formed on the non-magnetic intermediate layer, wherein said first magnetic layer includes Co, Pt, and Cr, said non-magnetic intermediate layer is made of Ru and has a thickness of 0.4 to 0.8 nm, said second magnetic layer contains Co as a main component, said first magnetic layer and said second magnetic layer are magnetized in the antiparallel direction in the absence of an applied magnetic field and said first magnetic layer is formed to contain an amount of Pt no less than 3 at % and no more than 9 at % so as to improve a signal-to-noise ratio of the magnetic recording medium, and said underlayer comprises Cr and Ti.