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Proceedings Paper

Ultrafast photo-enhanced ferromagnetism in GaMnAs
Author(s): Jigang Wang; Ingrid Cotoros; Xinyu Liu; Jacek K. Furdyna; Daniel S. Chemla
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Paper 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 Tc and completely dominates the demagnetization at high temperatures approaching Tc. 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 Tc and transient increase of Tc. These results constitute the evidence for non-thermal, cooperative spin manipulation in (III,Mn)Vs on the ultrafast time scale.

Paper Details

Date Published: 14 February 2008
PDF: 7 pages
Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68920Q (14 February 2008); doi: 10.1117/12.759872
Show Author Affiliations
Jigang Wang, Lawrence Berkeley National Lab. (United States)
Univ. of California, Berkeley (United States)
Ingrid Cotoros, Lawrence Berkeley National Lab. (United States)
Univ. of California, Berkeley (United States)
Xinyu Liu, Univ. of Notre Dame (United States)
Jacek K. Furdyna, Univ. of Notre Dame (United States)
Daniel S. Chemla, Lawrence Berkeley National Lab. (United States)
Univ. of California, Berkeley (United States)


Published in SPIE Proceedings Vol. 6892:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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