Patent ID: 6395412
Filing Date: 2002-05-28
Classification: G11B,Y10T

Abstract:
A magnetic recording medium having a field of writing and reading by a magnetic head, said medium comprising:a substrate; a magnetic layer; a protective layer; said substrate having a two-dimensional square average square root roughness Rq that is 5 nm or less; said magnetic layer having a two-dimensional square average square root roughness Rq that is less than the two-dimensional square average square root roughness Rq of said substrate in the field of writing and reading; an underlayer selected from the group consisting of Cr and CrTi; said substrate being a Niâ€”P/Al substrate; said magnetic layer being selected from the group consisting of CoCrTa and CoCrPt on said underlayer; said underlayer being on said substrate; and said protective layer being selected from the group consisting of C and DLC.