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SUMMARY:Optically driven domain wall motion in dilute magnetic semiconduct
 or - Dr Andrew Ramsey\, Hitachi Cambridge Laboratory
DTSTART:20140616T131500Z
DTEND:20140616T141500Z
UID:TALK52319@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:In the first part of the talk\, I will give a brief overview o
 f the Hitachi Cambridge Laboratory. Then I will present unpublished result
 s demonstrating control of magnetic domain wall position using a train of 
 ultrafast laser pulses in a thin film of GaMnAsP\, a dilute magnetic semic
 onductor. The laser generates two main forces acting on the domain wall. T
 he first polarization independent force is proportional to the laser induc
 ed temperature gradient and attracts the domain wall to the laser hot-spot
 . The direction of the second force depends on the helicity of the laser\,
  and is identified as the optical spin transfer torque\, where the spin of
  the photo-carriers exerts a torque on the magnetization via the exchange 
 interaction. The experiments provide strong insights into the physics of l
 aser induced magnetization reversal\, and tools for local measurements of 
 domain wall dynamics.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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