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Proceedings Paper

Spin dynamics and manipulation in GaMnAs alloys
Author(s): X. Liu; Y. Y. Zhou; E. Harley; L. E. McNeil; J. Wang; J. Qi; Y. Xu; A. Steigerwald; N. Tolk; J. P. Zahn; A. Gamouras; S. March; K. C. Hall; J. K. Furdyna
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Paper Abstract

We review recent experiments on spin excitation and manipulation in the ferromagnetic semiconductor GaMnAs. Spin dynamics in GaMnAs have been studied by two complementary approaches - by frequency-domain techniques, such as Brillouin light scattering (BLS) and ferromagnetic resonance (FMR); and by optical real-time techniques, such as ultrafast pump-probe magneto-optical spectroscopy. Using BLS and FMR, magnon frequencies (or resonance fields), were investigated as a function of Mn concentration, temperature and direction of magnetization, leading to information on magnetic anisotropy. Time-resolved magneto-optical Kerr effect, on the other hand, was used to study photo-induced femtosecond magnetization rotation, ultrafast optical demagnetization, and collective magnetization precession. Optically-induced transient changes in magnetization of GaMnAs produced by femtosecond laser pulses are analyzed and discussed in terms of the Landau-Lifshitz-Gilbert model. Finally, for completeness, we also discuss carrier-mediated nonthermal and thermal (lattice-heating) contributions to spin dynamics.

Paper Details

Date Published: 1 March 2010
PDF: 15 pages
Proc. SPIE 7600, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV, 76000T (1 March 2010); doi: 10.1117/12.840415
Show Author Affiliations
X. Liu, Univ. of Notre Dame (United States)
Y. Y. Zhou, Univ. of Notre Dame (United States)
E. Harley, Univ. of North Carolina at Chapel Hill (United States)
L. E. McNeil, Univ. of North Carolina at Chapel Hill (United States)
J. Wang, Iowa State Univ. (United States)
J. Qi, Vanderbilt Univ. (United States)
Y. Xu, Vanderbilt Univ. (United States)
A. Steigerwald, Vanderbilt Univ. (United States)
N. Tolk, Vanderbilt Univ. (United States)
J. P. Zahn, Dalhousie Univ. (Canada)
A. Gamouras, Dalhousie Univ. (Canada)
S. March, Dalhousie Univ. (Canada)
K. C. Hall, Dalhousie Univ. (Canada)
J. K. Furdyna, Univ. of Notre Dame (United States)

Published in SPIE Proceedings Vol. 7600:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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