Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9834646 | Journal of Magnetism and Magnetic Materials | 2005 | 5 Pages |
Abstract
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 αEY 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.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
B. Koopmans, H.H.J.E. Kicken, M. van Kampen, W.J.M. de Jonge,