Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes inGaMnAs

Wang, J.; Cotoros, I.; Dani, K. M.; Liu, X.; Furdyna, J. K.; Chemla, D. S.

doi:10.1103/PhysRevLett.98.217401

Title: Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes inGaMnAs

Journal Article · Sat Feb 17 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.98.217401· OSTI ID:918935

Wang, J.; Cotoros, I.; Dani, K. M.; Liu, X.; Furdyna, J. K.; Chemla, D. S.

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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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Director. Office of Science. Basic EnergySciences

DOE Contract Number:: DE-AC02-05CH11231

OSTI ID:: 918935

Report Number(s):: LBNL-62724; PRLTAO; R&D Project: 504901; BnR: KC0202020; TRN: US200819%%512

Journal Information:: Physical Review Letters, Vol. 98, Issue 21; Related Information: Journal Publication Date: May 22, 2007; ISSN 0031-9007

Country of Publication:: United States

Language:: English

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