Frequency generation by a magnetic vortex-antivortex dipole in spin-polarized current

Komineas, Stavros (2012) Frequency generation by a magnetic vortex-antivortex dipole in spin-polarized current. Europhysics Letters, 98 (5). 57002-p1-57002-p6.

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A vortex-antivortex (VA) dipole may be generated due to a spin-polarized current flowing through a nano-aperture in a magnetic element. We study the vortex dipole dynamics using the Landau-Lifshitz equation in the presence of an in-plane applied magnetic field and a Slonczewski spin-torque term with in-plane polarization. We establish that the vortex dipole is set in steady state rotational motion. The frequency of rotation is due to two independent forces: the interaction between the two vortices and the external magnetic field. The nonzero skyrmion number of the dipole is responsible for both forces giving rise to rotational dynamics. The spin-torque acts to stabilize the vortex dipole motion at a definite vortex-antivortex separation distance. We give analytical and numerical results for the angular frequency of rotation and VA dipole features as functions of the parameters.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Mathematics > Department of Applied Mathematics
Depositing User: Mr Stavros Komineas
Date Deposited: 04 Jun 2012 11:13
Last Modified: 12 Apr 2018 19:14

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