Patent ID: 6251532
Filing Date: 2001-06-26
Classification: C22C,G11B,Y10S

Abstract:
A magnetic recording medium comprising:a nonmagnetic substrate;a magnetic layer formed on the surface of said nonmagnetic substrate directly or on a nonmagnetic underlayer which is formed directly on the surface of the nonmagnetic substrate; anda protective layer formed on said magnetic layer;wherein said magnetic recording medium satisfies the following relationships:-0.5.ltoreq.{Hc(1)-Hc(p)}/Hc(1).ltoreq.0.3Hc(1).gtoreq.2 kOe20 G.times..mu.m.ltoreq.Br(1).times.t.ltoreq.100 G.times..mu.mKu.gtoreq.3.times.10.sup.6 erg/cm.sup.3t.ltoreq.20 nmwherein Hc(1) is a coercivity of said magnetic layer measured in the longitudinal direction; Hc(p) is a coercivity of said magnetic layer measured in the perpendicular direction; Br(1) is a remanent magnetization of said magnetic layer measured in the longitudinal direction; Ku is a magnetic anisotropy energy of said magnetic layer; and ""t"" is a layer thickness of said magnetic layer.