Femtosecond all-optical modulation of collective spin in the (Ga,Mn)As ferromagnet

TitleFemtosecond all-optical modulation of collective spin in the (Ga,Mn)As ferromagnet
Publication TypeJournal Article
Year of Publication2012
AuthorsKapetanakis MD, Wang JG, Perakis IE
Journal TitleJournal of the Optical Society of America B-Optical Physics
Volume29
PagesA95-A102
Date Published02
Type of ArticleArticle
ISBN Number0740-3224
Accession NumberWOS:000300407300014
Keywordsanisotropy, magnetization dynamics, semiconductors, ultrafast
Abstract

Using a many-body theory, we discuss some fundamental issues of femtomagnetism in magnetic electronic systems. We address the question of how spin may couple to transient optical coherence during time scales shorter than the photoexcitation duration and the characteristic times of interaction with the lattice. We also discuss the role of the competition between magnetic exchange and spin-orbit interactions in the nonthermal temporal evolution regime. Using density matrix equations of motion, we predict a femtosecond collective spin tilt leading to nonthermal magnetization modulation and all-optical ultrafast switching between different metastable magnetic states of (Ga,Mn)As ferromagnets. This spin dynamics is triggered by carrier coherences and by nonthermal populations photoexcited along the {111} equivalent directions of the Brillouin zone, which can be controlled by tuning the laser frequency/intensity and by using a small magnetic field. We present femtosecond magneto-optical spectroscopy experimental results that agree with our predictions. Our results indicate the possibility of reading the (Ga,Mn)As magnetic memory at THz speeds limited only by the pulse duration. (C) 2012 Optical Society of America

URL<Go to ISI>://WOS:000300407300014
DOI10.1364/JOSAB.29.000A95
Alternate JournalJ. Opt. Soc. Am. B-Opt. Phys.