Magnetic vortex gyration mediated by point-contact position

doi:10.1088/1674-1056/ab4277

中国物理B ›› 2019, Vol. 28 ›› Issue (10): 107503-107503.doi: 10.1088/1674-1056/ab4277

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Magnetic vortex gyration mediated by point-contact position

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)

College of Physics, Jilin Normal University, National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, China

收稿日期:2019-05-20 修回日期:2019-08-05 出版日期:2019-10-05 发布日期:2019-10-05
通讯作者: Hui-Lian Liu E-mail:huiliannan@126.com
基金资助:
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).

Magnetic vortex gyration mediated by point-contact position

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)

College of Physics, Jilin Normal University, National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, China

Received:2019-05-20 Revised:2019-08-05 Online:2019-10-05 Published:2019-10-05
Contact: Hui-Lian Liu E-mail:huiliannan@126.com
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: magnetic vortex, spin-polarized current, point-contact, micromagnetic simulation

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.

Key words: magnetic vortex, spin-polarized current, point-contact, micromagnetic simulation

中图分类号: (Magnetic properties of nanostructures)

75.75.-c

75.78.-n (Magnetization dynamics) 72.25.Mk (Spin transport through interfaces) 75.78.Cd (Micromagnetic simulations ?)

李化南, 笵紫薇, 李佳欣, 胡月, 刘惠莲. Magnetic vortex gyration mediated by point-contact position[J]. 中国物理B, 2019, 28(10): 107503-107503.

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[J]. Chin. Phys. B, 2019, 28(10): 107503-107503.

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Magnetic vortex gyration mediated by point-contact position

Magnetic vortex gyration mediated by point-contact position

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