Optically driven domain wall motion in dilute magnetic semiconductor

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• Dr Andrew Ramsey, Hitachi Cambridge Laboratory
• Monday 16 June 2014, 14:15-15:15
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Teri Bartlett.

In the first part of the talk, I will give a brief overview of the Hitachi Cambridge Laboratory. Then I will present unpublished results demonstrating control of magnetic domain wall position using a train of ultrafast laser pulses in a thin film of GaMnAsP, a dilute magnetic semiconductor. The laser generates two main forces acting on the domain wall. The first polarization independent force is proportional to the laser induced 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 laser induced magnetization reversal, and tools for local measurements of domain wall dynamics.

This talk is part of the Semiconductor Physics Group Seminars series.

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• All Cavendish Laboratory Seminars
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• ME Seminar
• Mott Seminar Room, Cavendish Laboratory, Department of Physics
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• School of Physical Sciences
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• Thin Film Magnetic Talks

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