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

Abstract

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 Tbits/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> can be readily achieved with a medium signal-to-noise ratio above 13 dB (1T-SNR) and thermal stability at K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</sub> V = 60 k <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">B</sub> T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">300°K</sub> .