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

• Published in: IEEE transactions on magnetics Vol. 46; no. 3; pp. 751 - 757
• Main Authors: Zhu, Jian-Gang, Wang, Yiming
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.03.2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC generators; Cross-disciplinary physics: materials science; rheology; Density; Electrodes; Exact sciences and technology; Frequency; Local oscillators; Magnetic recording; Magnetic switching; Magnetism; MAMR; Materials science; Micromagnetics; Microwave generation; Microwave oscillators; Microwaves; Noise levels; Oscillators; Other topics in materials science; Physics; PSTO; Recording; spin transfer torque; STT; STT oscillator; Torque; Electrodes; STT; Microwave radiation; spin transfer torque; STT oscillator; MAMR; PSTO; Oscillators; Magnetic recording; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2009.2036588

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 2 can be readily achieved with a medium signal-to-noise ratio above 13 dB (1T-SNR) and thermal stability at K u V = 60 k B T 300°K .