Title :
Ultrafast optical manipulation of ferromagnetic order in InMnAs/GaSb
Author :
Wang, J. ; Khodaparast, G.A. ; Kono, J. ; Slupinski, T. ; Oiwa, A. ; Munekata, H.
Author_Institution :
Rice Quantum Inst., Rice Univ., Houston, TX, USA
Abstract :
We have performed a two-color time-resolved magneto-optical Kerr effect (MOKE) study of a ferromagnetic InMnAs/GaSb heterostructure. We observed ultrafast photo-induced changes in the MOKE signal induced by a large density of spin-polarized transient carriers created only within the InMnAs layer using intense 140 fs mid-infrared pulses. Our data clearly demonstrates that magnetic properties, e.g., remanence and coercivity, can be strongly modified. The dependence of these changes on the time delay, pump polarization, pump intensity, and sample temperature is discussed.
Keywords :
III-V semiconductors; Kerr magneto-optical effect; coercive force; electron spin polarisation; ferromagnetic materials; gallium compounds; indium compounds; magnetic hysteresis; magnetic semiconductors; manganese compounds; optical pumping; spin dynamics; spin polarised transport; 140 fs; III-V ferromagnetic semiconductors; InMnAs-GaSb; InMnAs/GaSb ferromagnetic heterostructure ultrafast optical manipulation; MOKE signal ultrafast photo-induced changes; ferromagnetic hysteresis loops; intense mid-infrared pulses; pump intensity; pump polarization; remanence/coercivity magnetic properties; sample temperature; spin-polarized transient carrier density; time delays; two-color time-resolved magneto-optical Kerr effect spectroscopy; ultrafast spin dynamics; Coercive force; Delay effects; Kerr effect; Magnetic properties; Magnetooptic effects; Nonlinear optics; Optical pumping; Polarization; Remanence; Ultrafast optics;
Conference_Titel :
High Performance Devices, 2002. Proceedings. IEEE Lester Eastman Conference on
Print_ISBN :
0-7803-7478-9
DOI :
10.1109/LECHPD.2002.1146769
