Ultrafast photo-enhanced ferromagnetism in GaMnAs

Jigang Wang; Ingrid Cotoros; Xinyu Liu; Jacek K. Furdyna; Daniel S. Chemla

doi:10.1117/12.759872

14 February 2008 Ultrafast photo-enhanced ferromagnetism in GaMnAs

Jigang Wang, Ingrid Cotoros, Xinyu Liu, Jacek K. Furdyna, Daniel S. Chemla

Proceedings Volume 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII; 68920Q (2008) https://doi.org/10.1117/12.759872
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

We present the observation of ultrafast photo-enhancement of ferromagnetism in Mn-doped III-V semiconductor GaMnAs via photoexcited transient carriers. Our time-resolved magneto-optical Kerr spectroscopy reveals transient enhancement of the magnetization amplitude on a 100 ps time scale after initial sub-picosecond demagnetization. The dynamic enhancement of the magnetic ordering shows a maximum below the Curie temperature T_c and completely dominates the demagnetization at high temperatures approaching T_c. We attribute the observed ultrafast collective ordering to the transiently enhanced hole-Mn p-d exchange interaction, leading in particular to a correlation-induced maximum bellow T_c and transient increase of T_c. These results constitute the evidence for non-thermal, cooperative spin manipulation in (III,Mn)Vs on the ultrafast time scale.

Citation Download Citation

Jigang Wang, Ingrid Cotoros, Xinyu Liu, Jacek K. Furdyna, and Daniel S. Chemla "Ultrafast photo-enhanced ferromagnetism in GaMnAs", Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68920Q (14 February 2008); https://doi.org/10.1117/12.759872

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