Memory effects in photoinduced femtosecond magnetization rotation in ferromagnetic GaMnAs

in ferromagnetic GaMnAs J. Wang, I. Cotoros, D. S. Chemla, X. Liu, J. K. Furdyna, J. Chovan, and I. E. Perakis Department of Physics and Astronomy and Ames Laboratory-USDOE, Iowa State University, Ames, Iowa 50011, USA Department of Physics and Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, University of California at Berkeley, Berkeley, California 94720, USA Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA Department of Physics, University of Crete, Heraklion, 71003 Crete, Greece and Institute of Electronic Structure and Laser, Foundation for Research and Technology, Hellas, Heraklion, 71110 Crete, Greece