Patent ID: 6372367
Filing Date: 2002-04-16
Classification: B32B,G11B

Abstract:
A magnetic recording medium comprising:a base; a first underlayer formed over said base; a second underlayer formed on said first underlayer and having a plurality of protrusions with a predetermined density; a third underlayer formed over said second underlayer and including an alloy containing Ni, at least one element selected from a first group consisting of Cr, Ti, V, Mo and Nb, and at least one element selected from a second group consisting of Zr, Ta, Hf, Y and W, wherein Ni is present in an atomic percent greater than any other element in said third underlayer alloy; a fourth underlayer formed on said third underlayer; and a magnetic layer formed over said fourth underlayer; wherein said first underlayer includes an alloy containing a selected one of Co and Ni, at least one element selected from the first group consisting of Cr, Ti, V, Mo and Nb, and at least one element selected from the second group consisting of Zr, Ta, Hf, Y and W, wherein said selected one of Co and Ni is present in an amount greater than any other element in said first underlayer alloy; and wherein said second underlayer includes a selected one of Al and an alloy containing Al in an amount greater than any other element in said second underlayer alloy.