Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs
J. Wang, I. Cotoros, K. M. Dani, D. S. Chemla, X. Liu, J. K. Furdyna
Abstract
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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