Micromagnetic Study of Spin Transfer driven Vortex Dipole and Vortex Quadrupole Dynamics

Abstract

Vortices and antivortices 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.

4 pages, 4 figures

References in corpus (4)

• Spin torque building blocks
• Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
• Rotating vortex dipoles in ferromagnets
• Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole

Cited by in corpus (1)

• Magnetic radial vortex stabilization and efficient manipulation driven by the Dzyaloshinskii Moriya Interaction and the spin-transfer torque