Patent ID: 9007721
Filing Date: 2015-04-14
Classification: G11B

Abstract:
1. A magnetic recording head comprising: a main magnetic pole configured to generate a recording field; and a spin torque oscillator, wherein: the spin torque oscillator includes a stacked spin injection layer and a high frequency magnetic field generation layer; the stacked spin injection layer has a stacked structure including a first magnetic layer, a coupling layer, and a second magnetic layer that are stacked in the order mentioned from a far side as viewed from the high frequency magnetic field generation layer; the spin torque oscillator is configured so that magnetization of the first magnetic layer and magnetization of the second magnetic layer are coupled antiparallel to each other; and the following relationship is satisfied:  where Bs where the effective magnetic anisotropy field is defined as the sum of a crystalline magnetic anisotropy magnetic field and a shape magnetic anisotropy magnetic field.