Ultrafast magneto-optical spectroscopy of GaMnAs

Jean Benoit Heroux; Eiji Kojima; Y. Ino; Y. Hashimoto; Shingo Katsumoto; Yasushiro Iye; Makoto Kuwata-Gonokami

doi:10.1117/12.601978

13 April 2005 Ultrafast magneto-optical spectroscopy of GaMnAs (Invited Paper)

Jean Benoit Heroux, Eiji Kojima, Y. Ino, Y. Hashimoto, Shingo Katsumoto, Yasushiro Iye, Makoto Kuwata-Gonokami

Proceedings Volume 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX; (2005) https://doi.org/10.1117/12.601978
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

Spin dynamics in the III-V dilute magnetic semiconductor GaMnAs is investigated by photo-induced demagnetization. Experimental results obtained from two different time-dependent characterization techniques - "two color-probe" magneto-optical Kerr effect (TR-MOKE) and mid-infrared differential transmittance -- are compared. Upon photo-excitation with a 100 fs, 3.1 eV light pulse, a long demagnetization time in the hundreds of picoseconds timescale is found by TR-MOKE, indicating a spin-dependent band structure in this material. In mid-infrared measurements, a positive increase of the differential transmittance is observed in the same time interval when the sample is cooled below its Currie temperature. It is shown that this mid-infrared absorption feature is directly related to ferromagnetism in this material. The magnetism-related component of the broad DC mid-infrared absorption peak characteristic of this p-type material could be observed with this time-resolved measurement. Experimental results were simulated with a model describing the interaction between three thermal reservoirs (hole, spin and lattice) and taking thermal diffusion into account.

Citation Download Citation

Jean Benoit Heroux, Eiji Kojima, Y. Ino, Y. Hashimoto, Shingo Katsumoto, Yasushiro Iye, and Makoto Kuwata-Gonokami "Ultrafast magneto-optical spectroscopy of GaMnAs (Invited Paper)", Proc. SPIE 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX, (13 April 2005); https://doi.org/10.1117/12.601978

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