Patent ID: 6569545
Filing Date: 2003-05-27
Classification: G11B,Y10S

Abstract:
A magnetic recording medium comprising:a single or multiple underlayer formed on a disk substrate, a magnetic layer having a granular structure formed on said underlayer, wherein said granular structure has magnetic grains dispersed in a non-magnetic phase and a c axis of the magnetic grain is randomly oriented, the ratio Hcc/Hcr of said magnetic recording medium is more than 1.0 and less than or equal to 3.0, wherein said Hcc is defined as the coercive force as measured in a circumferential direction of the magnetic recording medium, said Hcr is defined as the coercive force as measured in a radial direction of the magnetic recording medium; and the average magnetic grain size of said magnetic layer is equal or more than 8 nm and equal or less than 14 nm, and the normalized grain size dispersion of said magnetic grain is equal or less than 0.4.