Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 286, Issue -, Pages 271-275Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2004.09.079
Keywords
spin-dynamics; demagnetization; ferromagnetic materials; magnetization; magneto-optical effects
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We present a microscopic model that explains quenching of the magnetization of ferromagnetic transition metals such as nickel within a picosecond after laser excitation. Our model describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by the Weiss model. An Elliot-Yafet type of spin-flip probability alpha(EY) is included for each electron-phonon (e-p) scattering event. We show that even though the demagnetization in our model is mediated by phonon scattering, it is possible to obtain a demagnetization time that is shorter than the e-p equilibration (and even thermalization) time. (C) 2004 Elsevier B.V. All rights reserved.
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