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Chin. Phys. B, 2015, Vol. 24(4): 047501    DOI: 10.1088/1674-1056/24/4/047501
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
Abstract  

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 (ip1, ip0, ip2)=(-1, 1, -1), the trajectory of the vortex core is a peanut-like orbit, but it is an elliptical orbit for (ip1, ip0, ip2)=(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.

Keywords:  vortex core      spin-polarized current      Oersted field      Thiele'      s equation  
Received:  16 October 2014      Revised:  12 November 2014      Accepted manuscript online: 
PACS:  75.40.Mg (Numerical simulation studies)  
  72.25.Dc (Spin polarized transport in semiconductors)  
  11.40.-q (Currents and their properties)  
  75.75.-c (Magnetic properties of nanostructures)  
Fund: 

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).

Corresponding Authors:  Liu Yan     E-mail:  liuyanphys@mail.neu.edu.cn

Cite this article: 

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 2015 Chin. Phys. B 24 047501

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