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

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2 Author(s)
Jian-Gang Zhu ; Dept. of ECE, Carnegie Mellon Univ., Pittsburgh, PA, USA ; Wang, Yiming

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/in2 can be readily achieved with a medium signal-to-noise ratio above 13 dB (1T-SNR) and thermal stability at KuV = 60 kB T300°K.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 3 )