Trajectory and frequency of vortex gyration in a multi-nanocontact geometry

doi:10.1088/1674-1056/24/4/047501

中国物理B ›› 2015, Vol. 24 ›› Issue (4): 47501-047501.doi: 10.1088/1674-1056/24/4/047501

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

Trajectory and frequency of vortex gyration in a multi-nanocontact geometry

李化南^{a b}, 柳艳^a, 贾敏^a, 杜安^a

a College of Sciences, Northeastern University, Shenyang 110819, China;
b College of Physics, Jilin Normal University, Siping 136000, China

收稿日期:2014-10-16 修回日期:2014-11-12 出版日期:2015-04-05 发布日期:2015-04-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11404053) and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. n130405011).

Trajectory and frequency of vortex gyration in a multi-nanocontact geometry

Li Hua-Nan (李化南)^{a b}, Liu Yan (柳艳)^a, Jia Min (贾敏)^a, Du An (杜安)^a

a College of Sciences, Northeastern University, Shenyang 110819, China;
b College of Physics, Jilin Normal University, Siping 136000, China

Received:2014-10-16 Revised:2014-11-12 Online:2015-04-05 Published:2015-04-05
Contact: Liu Yan E-mail:liuyanphys@mail.neu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11404053) and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. n130405011).

摘要/Abstract

摘要：

Nonlinear vortex gyrotropic motion in a three-nanocontacts system is investigated by micromagnetic simulations and analytical calculations. Three out-of-plane spin-polarized currents are injected into a nanodisk through a centered nanocontact and two off-centered nanocontacts, respectively. For current combination (i_p1, i_p0, i_p2)=(-1, 1, -1), the trajectory of the vortex core is a peanut-like orbit, but it is an elliptical orbit for (i_p1, i_p0, i_p2)=(1, 1, -1). Moreover, the gyrotropic frequency displays peaks for both current combinations. Analytical calculations based on the Thiele equation show that the changes of frequency can be ascribed mainly to the forces generated by the Oersted field accompanying the currents. We also demonstrate a dependence of eigenfrequency shifts on the direction and distance of the applied currents.

关键词: vortex core, spin-polarized current, Oersted field, Thiele', s equation

Abstract:

Key words: vortex core, spin-polarized current, Oersted field, Thiele', s equation

中图分类号: (Numerical simulation studies)

75.40.Mg

72.25.Dc (Spin polarized transport in semiconductors) 11.40.-q (Currents and their properties) 75.75.-c (Magnetic properties of nanostructures)

李化南, 柳艳, 贾敏, 杜安. Trajectory and frequency of vortex gyration in a multi-nanocontact geometry[J]. 中国物理B, 2015, 24(4): 47501-047501.

Li Hua-Nan (李化南), Liu Yan (柳艳), Jia Min (贾敏), Du An (杜安). Trajectory and frequency of vortex gyration in a multi-nanocontact geometry[J]. Chin. Phys. B, 2015, 24(4): 47501-047501.

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Trajectory and frequency of vortex gyration in a multi-nanocontact geometry

Trajectory and frequency of vortex gyration in a multi-nanocontact geometry

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