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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 2 — Feb. 1, 2012
  • pp: A95–A102

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

Myron D. Kapetanakis, Jigang Wang, and Ilias E. Perakis  »View Author Affiliations


JOSA B, Vol. 29, Issue 2, pp. A95-A102 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000A95


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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.

© 2012 Optical Society of America

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.0320) Ultrafast optics : Ultrafast optics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

History
Original Manuscript: November 7, 2011
Manuscript Accepted: November 29, 2011
Published: January 30, 2012

Citation
Myron D. Kapetanakis, Jigang Wang, and Ilias E. Perakis, "Femtosecond all-optical modulation of collective spin in the (Ga,Mn)As ferromagnet," J. Opt. Soc. Am. B 29, A95-A102 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-2-A95


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