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Phys Rev Lett. 2007 May 25;98(21):217401. Epub 2007 May 22.

Ultrafast enhancement of ferromagnetism via photoexcited holes in GaMnAs.

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1
Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.

Abstract

We report on the observation of ultrafast photoenhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100 ps time scale, after an initial subpicosecond demagnetization. The dynamic magnetization enhancement exhibits a maximum below the Curie temperature T(c) and dominates the demagnetization component when approaching T(c). 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 20 K and a transient increase in T(c).

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