Abstract
Femtosecond optical control of the magnetization and coercive field is demonstrated in GaMnAs using time-resolved magneto-optical Kerr effect techniques. These experiments reveal a near-complete, subpicosecond collapse of the hysteresis loop, consistent with femtosecond demagnetization. On longer time scales (∼300ps) an increase in coercivity is observed, attributed to hole-mediated enhancement of the domain wall energy.
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