A microwave assisted magnetic recording head with dual spin polarization layer spin torque oscillator

摘要

A microwave assisted magnetic recording head (MAMR) includes a main magnetic pole, a spin torque oscillator (STO) 600 positioned near the main magnetic pole. The STO includes a first perpendicular magnetic layer 606 positioned above the main magnetic pole, where the first perpendicular magnetic layer is a first spin polarization layer having an axis of magnetic anisotropy in a direction perpendicular to a film surface. A first non-magnetic transmission layer 604 is positioned above the first perpendicular magnetic layer and, a field generation layer (FGL) magnetic layer 602 effectively having a plane of easy magnetization in the film surface is positioned above the first non-magnetic transmission layer. A second non-magnetic transmission layer 614 is positioned above the FGL magnetic layer, and a second perpendicular magnetic spin polarization layer 612 having perpendicular magnetic anisotropy is positioned above the second non-magnetic transmission layer. The thickness of the first perpendicular magnetic layer may be greater than the thickness of the second perpendicular magnetic layer.