Metal thin film magnetic recording medium having a Cr Ta Cu underlayer and a copt magnetic layer

摘要

A magnetic recording medium has a magnetic layer of a Co alloy with a Pt content of about 3 to about 6 atomic % and is given a higher coercive force. The medium includes a ground layer formed on a nonmagnetic base plate and having a composition comprising, as expressed in atomic %, 1 to 6% of Ta, 1 to 6% of Cu and the balance substantially Cr, whereby an increased crystal lattice constant is afforded to the Cr.