Patent ID: 6124030
Filing Date: 2000-09-26
Classification: G11B,Y10S,Y10T

Abstract:
A cleaning medium for cleaning a magnetic head of magnetic recording devices, consisting essentially of:i) a non-magnetic substrate,ii) a lower coating layer, which is overlaid upon the non-magnetic substrate and primarily contains a binder and non-magnetic inorganic particles dispersed in the binder, andiii) a cleaning layer, which is overlaid upon the lower coating layer and contains a binder and inorganic particles dispersed in the binder, wherein a portion of the inorganic particles are ferromagnetic particles,wherein at least 50% by weight portion of the non-magnetic inorganic particles, which are contained in the lower coating layer, is constituted of granular inorganic particles, which have a mean particle diameter of at most 0.08 .mu.m, or acicular inorganic particles, which have a mean longer axis length falling within the range of 0.05 .mu.m to 0.3 .mu.m and an acicular ratio falling within the range of 3 to 20,wherein the cleaning medium is for cleaning a magnetic head of magnetic recording devices,wherein the cleaning medium is such that a rate of head wear of a magnetic head cleaned with the cleaning medium is equal to or greater than 0.1 .mu.m/10 min and less than 0.5 .mu.m/10 min, andwherein the non-magnetic inorganic particles, which are contained in the lower coating layer, are constituted of at least a single kind of particle selected from the group consisting of titanium oxide particles, .alpha.-iron oxide particles, barium sulfate particles, zinc oxide particles, and alumina particles.