Patent ID: 6235368
Filing Date: 2001-05-22
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium consisting of a nonmagnetic substrate on which at least one lower layer which contains at least one acicular pigment which is dispersed in a binder and an upper layer which contains a ferromagnetic metal powder which is dispersed in a binder are applied, the thickness of the upper layer being not more than 0.4 .mu.m, wherein the lower layer contains an acicular magnetic chromium oxide of the formula Cr.sup.a O.sub.x nH.sub.2 Owhereina is the average valency of the chromium with 3.1<a.ltoreq.3.7,x is the oxygen equivalent resulting from the valency of the chromium,n is the water content with 0<n<(4-a)/2,with a ratio of the average length to the average diameter of at least 3 and with a coercive force H.sub.c of 5-25 k/Am, and wherein the magnetic recording medium is subjected to a magnetic disorientation treatment immediately after application of the layers while the latter are in the wet state.