Micromagnetic prediction strain and current co-mediated spindynamics in skyrmion-based spin-torque nano-oscillator. (28th April 2022)

• Record Type: Journal Article
• Authors: Cui, Shuting; Zhu, Mingmin; Qiu, Yang; Guo, Rongdi; Wu, Guohua; Yu, Guoliang; Zhou, Haomiao
• Is Part Of: Journal of physics. Volume 55:Number 17(2022)
• Publication Date: 2022-04-28
• Subjects: spin-torque nano-oscillator -- skyrmion -- strain -- spintronic device -- micromagnetic simulation; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ac4dcb
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: In this article, we theoretically investigate the influence of strain on the oscillation frequency characteristics of a skyrmion-based spin-torque nano-oscillator (STNO) using micromagnetic simulations. The system consists of an ultrathin nanopillar magnetic film with interfacial Dzyaloshinskii–Moriya interactions and a ring-shaped region to offer a tunable spatial strain source. The applied strain gives rise to an extra effective field in the magnetic film through magnetoelastic coupling and forms a strong confined potential for skyrmion dynamics. Our simulation results show that the operation frequency of the STNO can be effectively modulated by the strain. Furthermore, we introduce a simplified analytical expression of the skyrmion gyration dynamics to explain the micromagnetic simulation results. Our results will be useful in the development of wide-range frequency-tunable microwave emitters and frequency-shift keying for wireless communication.