Vortexes and antivortexes are typical non uniform magnetization configurations that can be achieved in spin-torque oscillators with in-plane materials. Dynamics of a vortex-antivortex pair, namely vortex dipole, were predicted and already observed. In this paper, we present a systematic micromagnetic study on that kind of dynamics in different spin-valves where the current is injected through a nano-aperture. Rotation and translation of vortex dipoles and rotation of vortex quadrupoles are shown depending on the shape and the size of the spin-valve. The origin of the different behaviors is explained within a micromagnetic framework

Micromagnetic study of spin-transfer-driven vortex dipole and vortex quadrupole dynamics

GIORDANO, ANNA;PULIAFITO, VITO;AZZERBONI, Bruno;FINOCCHIO, Giovanni
2014-01-01

Abstract

Vortexes and antivortexes are typical non uniform magnetization configurations that can be achieved in spin-torque oscillators with in-plane materials. Dynamics of a vortex-antivortex pair, namely vortex dipole, were predicted and already observed. In this paper, we present a systematic micromagnetic study on that kind of dynamics in different spin-valves where the current is injected through a nano-aperture. Rotation and translation of vortex dipoles and rotation of vortex quadrupoles are shown depending on the shape and the size of the spin-valve. The origin of the different behaviors is explained within a micromagnetic framework
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/2690169
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