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

Text
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## Abstract

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 |
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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: | 06 May 2017 06:16 |

URI: | http://preprints.acmac.uoc.gr/id/eprint/127 |

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