Spin torque nano-oscillators based on antiferromagnetic skyrmions

DOI DOI PDF 被引用文献10件 参考文献64件
  • Laichuan Shen
    College of Physics and Electronic Engineering, Sichuan Normal University 1 , Chengdu 610068, China
  • Jing Xia
    School of Science and Engineering, The Chinese University of Hong Kong 2 , Shenzhen, Guangdong 518172, China
  • Guoping Zhao
    College of Physics and Electronic Engineering, Sichuan Normal University 1 , Chengdu 610068, China
  • Xichao Zhang
    School of Science and Engineering, The Chinese University of Hong Kong 2 , Shenzhen, Guangdong 518172, China
  • Motohiko Ezawa
    Department of Applied Physics, The University of Tokyo 4 , 7-3-1 Hongo, Tokyo 113-8656, Japan
  • Oleg A. Tretiakov
    Institute for Materials Research and Center for Science and Innovation in Spintronics, Tohoku University 5 , Sendai 980-8577, Japan
  • Xiaoxi Liu
    Department of Electrical and Computer Engineering, Shinshu University 3 , 4-17-1 Wakasato, Nagano 380-8553, Japan
  • Yan Zhou
    School of Science and Engineering, The Chinese University of Hong Kong 2 , Shenzhen, Guangdong 518172, China

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<jats:p>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 an 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.</jats:p>

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