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arXiv · 1811.02869

Spin torque nano-oscillators based on antiferromagnetic skyrmions

Laichuan Shen·Jing Xia·Guoping Zhao·Xichao Zhang·Motohiko Ezawa·Oleg A. Tretiakov·Xiaoxi Liu·Yan Zhou
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Abstract

Skyrmion-based spin torque nano-oscillators are potential next-generation microwave signal generators. However, ferromagnetic skyrmion-based spin torque nano-oscillators cannot reach high oscillation frequencies. In this work, we propose to use the circular motion of an antiferromagnetic skyrmion to create the oscillation signal in order to overcome this obstacle. Micromagnetic simulations demonstrate that the antiferromagnetic skyrmion-based spin torque nano-oscillators can produce high frequencies (tens of GHz). Furthermore, the speed of the circular motion for an antiferromagnetic skyrmion in a nanodisk is analytically derived, which agrees well with the results of numerical simulations. Our findings are useful for the understanding of the inertial dynamics of an antiferromagnetic skyrmion and the development of future skyrmion-based spin torque nano-oscillators.

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Laichuan Shen, Jing Xia, Guoping Zhao, Xichao Zhang, Motohiko Ezawa, Oleg A. Tretiakov, Xiaoxi Liu, Yan Zhou. 2018-11-07. Spin torque nano-oscillators based on antiferromagnetic skyrmions. https://doi.org/10.1063/1.5080302

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