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Modeling the fs Demagnetization: Laser-Induced Reversal in an Applied Magnetic Field

Published online by Cambridge University Press:  01 February 2011

Francesco Dalla Longa ,
Dion Boesten ,
Harm H.J.E. Kicken ,
Wim J.M. de Jonge  and
Bert Koopmans
Francesco Dalla Longa
Affiliation:
f.dalla.longa@tue.nl, Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, N/A, N/A, Netherlands
Dion Boesten
Affiliation:
d.boesten@student.tue.nl, Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, N/A, N/A, Netherlands
Harm H.J.E. Kicken
Affiliation:
h.h.j.e.kicken@tue.nl, Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, N/A, N/A, Netherlands
Wim J.M. de Jonge
Affiliation:
W.J.M.d.Jonge@tue.nl, Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, N/A, N/A, Netherlands
Bert Koopmans
Affiliation:
b.koopmans@tue.nl, Eindhoven University of Technology, Department of Applied Physics and center for NanoMaterials (cNM), P.O. Box 513, 5600 MB Eindhoven, N/A, N/A, Netherlands
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Abstract

A novel model for ultrafast laser-induced magnetization dynamics is analyzed. Equilibration of the magnetic system is described by including electron-phonon scattering events with a finite spin flip probability. Recently, we demonstrated that such a model predicts a direct relation between the demagnetization time and the Gilbert damping. Here we present numerical simulations based on the same Hamiltonian, but including the presence of an external applied field. Thereby, reversal of the magnetization after heating above the Curie temperature (Tc) can be modeled. We demonstrate that magnetization reversal can be achieved even if the lattice temperature stays below Tc.

Keywords

spintronicelectron-phonon interactionsmagnetooptic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 941: Symposium Q – Magnetic Thin Films, Heterostructures, and Device Materials , 2006 , 0941-Q02-02
Copyright
Copyright © Materials Research Society 2006

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References

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