Magnetic vortex gyration mediated by point-contact position

doi:10.1088/1674-1056/ab4277

Abstract Micromagnetic simulation is employed to study the gyration motion of magnetic vortices in distinct permalloy nanodisks driven by a spin-polarized current. The critical current density for magnetic vortex gyration, eigenfrequency, trajectory, velocity and the time for a magnetic vortex to obtain the steady gyration are analyzed. Simulation results reveal that the magnetic vortices in larger and thinner nanodisks can achieve a lower-frequency gyration at a lower current density in a shorter time. However, the magnetic vortices in thicker nanodisks need a higher current density and longer time to attain steady gyration but with a higher eigenfrequency. We also find that the point-contact position exerts different influences on these parameters in different nanodisks, which contributes to the control of the magnetic vortex gyration. The conclusions of this paper can serve as a theoretical basis for designing nano-oscillators and microwave frequency modulators.

Keywords: magnetic vortex spin-polarized current point-contact micromagnetic simulation

Received: 20 May 2019
Revised: 05 August 2019
Accepted manuscript online:

PACS:	75.75.-c	(Magnetic properties of nanostructures)
	75.78.-n	(Magnetization dynamics)
	72.25.Mk	(Spin transport through interfaces)
	75.78.Cd	(Micromagnetic simulations ?)

Fund: Project supported by the Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province, China (Grant No. JJKH20191007KJ) and the Program for Development of Science and Technology of Siping City, China (Grant No. 2016063).

Corresponding Authors: Hui-Lian Liu
E-mail: huiliannan@126.com

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Hua-Nan Li(李化南), Zi-Wei Fan(笵紫薇), Jia-Xin Li(李佳欣), Yue Hu(胡月), Hui-Lian Liu(刘惠莲) Magnetic vortex gyration mediated by point-contact position 2019 Chin. Phys. B 28 107503

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Magnetic vortex gyration mediated by point-contact position

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