Microwave Assisted Magnetic Recording Utilizing Perpendicular Spin Torque Oscillator With Switchable Perpendicular Electrodes

In this paper, we present a systematic micromagnetic modeling study on microwave assisted magnetic recording (MAMR) utilizing a perpendicular spin torque oscillator (PSTO) to generate localized circular ac field. The PSTO at narrow track width naturally produces a circular field rotating at desired high frequency within the plane of the media, resulting in a substantially enhanced effective write field gradient. With the STT oscillator generated ac field waveform, recording simulations show that area recording density exceeding 3 $\hbox{Tbits/in}^{2}$ can be readily achieved with a medium signal-to-noise ratio above 13 dB (1T-SNR) and thermal stability at ${\rm K}_{\rm u}{\rm V}=60{\rm k}_{\rm B}{\rm T}_{300^{\circ}{\rm K}}$.