Patent ID: 6881496

Claim:
A magnetic recording medium comprising: one or a plurality of underlayers; a first magnetic layer having a saturation magnetization Ms 1 and a thickness t 1 disposed above said one or plurality of underlayers; a first nonmagnetic layer provided on said first magnetic layer; a second magnetic layer, provided on said first nonmagnetic layer, having a saturation magnetization Ms 2 and a thickness t 2 ; a second nonmagnetic layer provided on said second magnetic layer; and a third magnetic layer, provided on said second nonmagnetic layer, having a saturation magnetization Ms 3 and a thickness t 3 , said first, second and third magnetic layers having magnetization directions which are alternately antiparallel in a state where no external magnetic field is applied on the magnetic recording medium, wherein Ms 2 ×t 2 <(Ms 1 ×t 1 +Ms 3 ×t 3 ); and wherein relationships t 2 <t 1 and t 2 <t 3 stand, wherein t 1 , t 2 and t 3 respectively denote thicknesses of said first, second and third magnetic layers.