Ultrafast Quenching of Ferromagnetism in InMnAs Induced by Intense Laser Irradiation

Details Ultrafast Quenching of Ferromagnetism in InMnAs Induced by Intense Laser Irradiation Ultrafast Quenching of Ferromagnetism in InMnAs Induced by Intense Laser Irradiation

2005-04-25

arxiv.org/abs/cond-mat/0504611v2

Phys. Rev. Lett. 95, 167401 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.167401

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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