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SUMMARY:Frequency generation by a magnetic vortex-antivortex dipole in spi
 n-polarized current- Prof. Stavros Komineas from the Dept. of Applied Math
 ematics\, Univ. of Crete\, Greece - Speaker to be confirmed
DTSTART:20120531T133000Z
DTEND:20120531T150000Z
UID:TALK38446@talks.cam.ac.uk
CONTACT:Kimberly Cole
DESCRIPTION:A rotating vortex-antivortex dipole may be generated due to sp
 in-polarized current flowing through a nano-aperture in a magnetic element
 .\nThe vortex dipole dynamics is analyzed using the Landau-Lifshitz equati
 on including a Slonczewski spin-torque term for in-plane spin-current pola
 rization.\nThe spin-torque acts to stabilize the vortex dipole at a defini
 te vortex-antivortex separation. We establish that the vortex dipole is se
 t in steady state rotational motion.\nAn external in-plane magnetic field 
 can be used to tune the frequency of rotation.\nWe derive analytically a r
 elation for the frequency of rotation and we find numerically steady-state
  rotating vortex-antivortex pairs in a more realistic model.\nThe rotating
  pair under a spin-polarized current is an attractor of the motion\, there
 fore it is expected to be a stable state.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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