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arxiv: cond-mat/0702439 · v2 · submitted 2007-02-19 · ❄️ cond-mat.stat-mech · cond-mat.mtrl-sci

Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs

J. Wang , I. Cotoros , K. M. Dani , D. S. Chemla (Materials Sciences Division , E.O. Lawrence Berkeley National Laboratory , Department of Physics , University of California at Berkeley , Berkeley
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California) X. Liu J. K. Furdyna (Department of Physics University of Notre Dame Notre Dame Indiana)
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classification ❄️ cond-mat.stat-mech cond-mat.mtrl-sci
keywords ultrafastdemagnetizationenhancementferromagnetismgamnasholesincreasemagnetization
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We report on the observation of ultrafast photo-enhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100-ps time scale, after an initial sub-ps demagnetization. The dynamic magnetization enhancement exhibits a maximum below the Curie temperature Tc and dominates the demagnetization component when approaching Tc. We attribute the observed ultrafast collective ordering to the p-d exchange interaction between photoexcited holes and Mn spins, leading to a correlation-induced peak around 20K and a transient increase in Tc.

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