Patent ID: 7736766
Filing Date: 2010-06-15
Classification: G11B

Abstract:
1. A magnetic recording medium comprising a substrate and a perpendicular magnetic recording layer on the substrate, wherein the magnetic recording layer comprises the following layers, in order: a first layer comprising an alloy comprising Co, Cr, Pt, and B; a second layer, different from the first layer, wherein the second layer comprises an alloy comprising Co, Cr, Pt, B, and ≦10 at. % but >0 at. %, of at least one of Au and Ag, wherein the second layer comprises ≧16 at. % and ≦30 at. % Cr, ≦30 at. % Pt, and ≦6 at. % B; and a third layer, different from the first and second layers, the third layer comprising an alloy comprising Co, Cr, Pt, B, and ≦10 at. % but >0 at. %, of at least one of Au and Ag, wherein the alloy in the third layer comprises ≦16 at. % Cr, ≦30 at. % Pt, and ≧5 at. % and ≦10 at. % B.