Magnetization dynamics in spin-torque oscillator with negative Ku for microwave assisted magnetic recording

The paper discusses the magnetization dynamics of spin-torque oscillator with negative K_u under alternative head field for microwave assisted magnetic recording. Magnetization switching of spin-injection layer (SIL) is essential to have the same precession mode of the field generation layer before and after the head field change directions. The SIL needs to be properly chosen in order to have short switching time. The layer stack and material selection of spin torque oscillator (STO) is also discussed in terms of stability against the stray field. The results discussed in this paper helps to understand the design fundamentals of STO for microwave assisted magnetic recording.