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- Title
Tuning Resonance Frequency of Spin Wave Localized in an Isolated Skyrmion by Magnetoelectric Couplings.
- Authors
Zhao, Rongzhi; Chen, Wenchao; Hu, Chenglong; Chen, Luyang; Zhang, Jian; Liu, Xianguo; Zhang, Xuefeng; Yan, Mi
- Abstract
Understanding the dynamic behavior of an isolated skyrmion with external perturbations has been obstructed due to the difficulty in experimentally observing such an instantaneous phenomenon within picoseconds. Herein, we theoretically investigated the spin-transfer-torque-induced dynamics of an isolated skyrmion excited by external nanosecond-pulse perturbations. It is found that a redshift of the resonant frequency appears under a pulse polarized current with ∼ 5 0 × 1 0 1 0 A/m2 and > 0. 9 3 GHz, while a blueshift is presented under a combined perturbation of the pulse polarized current and an out-of-plane ac magnetic field. The physic origins of the redshift and the blueshift are ascribed to the increased average energy of system from 1. 6 9 × 1 0 − 1 7 J to 1. 7 8 × 1 0 − 1 7 J and integer multiple (twofold and fourfold) oscillation frequencies of total energy, respectively. The present study could thus provide an insight to the micromagnetic dynamics of skyrmion under the magnetoelectric couplings.
- Subjects
SKYRMIONS; SPIN waves; RESONANCE; MATERIALS science; CURRENT fluctuations; CURRENT density (Electromagnetism)
- Publication
SPIN (2010-3247), 2019, Vol 9, Issue 3, pN.PAG
- ISSN
2010-3247
- Publication type
Article
- DOI
10.1142/S2010324719500097