Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 491, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2019.165610
Keywords
Skyrmion; Spin-torque nano-oscillator; Spintronics; Micromagnetics
Funding
- National Natural Science Foundation of China of China [51771127, 51571126, 51772004]
- Scientific Research Fund of Sichuan Provincial Education Department [18TD0010, 16CZ0006]
- Chinese University of Hong Kong, Shenzhen (CUHKSZ)
- National Natural Science Foundation of China [11574137]
- Shenzhen Fundamental Research Fund [JCYJ20160331164412545, JCYJ20170410171958839]
- CUHKSZ
- Longgang Key Laboratory of Applied Spintronics
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The oscillation frequency of the circular skyrmion motion in a nanodisk increases with the driving current density. However, the skyrmion may be destroyed at the nanodisk edge when the driving current density is larger than a threshold, which leads to a maximum oscillation frequency that may not be enough for ultrahigh frequency applications based on skyrmions. In this work, a modified nanodisk structure, in which a skyrmion can be driven by a large current density, is proposed. Numerical simulations demonstrate that when the edge of a ferromagnetic nanodisk has enhanced perpendicular magnetic anisotropy, the upper threshold of the skyrmion oscillation frequency can be increased by 75% compared to the original structure without enhanced edge. Our results may be useful for overcoming the frequency limit of the skyrmion-based spin-torque oscillator, which utilizes the current-induced oscillation of a skyrmion as the source of microwave power.
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