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Ultrafast Quenching of Ferromagnetism in InMnAs Induced by Intense Laser Irradiation

J. Wang·C. Sun·J. Kono·A. Oiwa·H. Munekata·L. Cywinski·L. J. Sham
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Abstract

Time-resolved magneto-optical Kerr spectroscopy of ferromagnetic InMnAs reveals two distinct {\em demagnetization} processes -- fast ($<1$ ps) and slow ($\sim$100 ps). Both components diminish with increasing temperature and are absent above the Curie temperature. The fast component rapidly grows with pump power and saturates at high fluences ($>10$ mJ/cm$^2$); the saturation value indicates a {\em complete quenching} of ferromagnetism on a sub-picosecond time scale. We attribute this fast dynamics to spin heating through $p$-$d$ exchange interaction between photo-carriers and Mn ions while the $\sim$100 ps component is interpreted as spin-lattice relaxation.

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J. Wang, C. Sun, J. Kono, A. Oiwa, H. Munekata, L. Cywinski, L. J. Sham. 2005-08-18. Ultrafast Quenching of Ferromagnetism in InMnAs Induced by Intense Laser Irradiation. https://doi.org/10.1103/physrevlett.95.167401

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