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

fYear

2002

fDate

6-8 Aug. 2002

Firstpage

307

Lastpage

314

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;

fLanguage

English

Publisher

ieee

Conference_Titel

High Performance Devices, 2002. Proceedings. IEEE Lester Eastman Conference on

Print_ISBN

0-7803-7478-9

Type

conf

DOI

10.1109/LECHPD.2002.1146769

Filename

1146769