Critical Current Density and Ferromagnetic Resonance Affected by Perpendicular Anisotropy in Spin Valve

Ferromagnetic resonance (FMR) and magnetization-switching-induced spin-transfer torque (STT) in spin valve had been investigated by 3-D micromagnetic simulations. The simulation results show that three resonance peaks attributing to various resonance modes were found. FMR frequencies can be controlled by the perpendicular anisotropy strength. At the same time, the critical current density of STT-induced magnetization switching can be obviously reduced by tuning the perpendicular anisotropy constant too.