Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-02-19
Physics
Condensed Matter
Statistical Mechanics
4 pages
Scientific paper
10.1103/PhysRevLett.98.217401
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.
Chemla Daniel S.
Cotoros I.
Dani K. M.
Furdyna Jacek K.
Liu Xiandong
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