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Frequency generation by a magnetic vortex-antivortex dipole in spin-polarized current- Prof. Stavros Komineas from the Dept. of Applied Mathematics, Univ. of Crete, Greece

A rotating vortex-antivortex dipole may be generated due to spin-polarized current flowing through a nano-aperture in a magnetic element. The vortex dipole dynamics is analyzed using the Landau-Lifshitz equation including a Slonczewski spin-torque term for in-plane spin-current polarization. The spin-torque acts to stabilize the vortex dipole at a definite vortex-antivortex separation. We establish that the vortex dipole is set in steady state rotational motion. An external in-plane magnetic field can be used to tune the frequency of rotation. We derive analytically a relation for the frequency of rotation and we find numerically steady-state rotating vortex-antivortex pairs in a more realistic model. The rotating pair under a spin-polarized current is an attractor of the motion, therefore it is expected to be a stable state.
When May 31, 2012
from 02:30 PM to 04:00 PM
Where Mott Seminar Room, Mott Building
Contact Name
Contact Phone 01223764822
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