Patent ID: 8722212

Claim:
A magnetic recording medium comprising: a non-magnetic granular layer; and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and wherein a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer, wherein an oxide material having a maximum content in each of the non-magnetic granular layer, the first granular layer, and the second granular layer magnetic layer are all different, and wherein a non-magnetic material used for magnetic separation in each of the non-magnetic granular layer, the first granular magnetic layer, and the second granular magnetic layer consists of a single oxide selected from the group consisting of SiO 2 , TiO 2 , and Cr 2 O 3 .