Brillouin light scattering observation of the transition from the superparamagnetic to the superferromagnetic state in nanogranular (SiO2)Co films

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Evolution of magnetic excitations from purely magnetostatic modes to dipole-exchange spin waves in the Damon–Eshbach geometry in nanocomposite (SiO₂)_100-xCo_x (50 at. %≪x≪80 at. %) films during a transition from superparamagnetic to superferromagnetic state has been studied by Brillouin light scattering. It has been shown that removal of the degeneracy of backward volume magnetostatic waves due to nonzero exchange constant manifests itself in more pronounced Stokes/anti-Stokes asymmetry. Accompanying static characterization by means of magnetic force microscopy imaging and grazing incidence small angle neutron scattering has demonstrated the presence of weak stripe domains in the superferromagnetic phase.

Published in:
Journal of Applied Physics (Volume:104 , Issue: 9 )

Date of Publication: Nov 2008

Page(s):: 093912 - 093912-13
ISSN :: 0021-8979
Digital Object Identifier :: 10.1063/1.3009339
Product Type:: Journals & Magazines

Date of Current Version :: 18 June 2009
Issue Date :: Nov 2008

Author(s)

Stashkevich, A.A.
LPMTM CNRS (UPR 9001), Université Paris 13, 93430 Villetaneuse, France
Roussigne, Y. ; Djemia, P. ; Billet, D. ; Stognij, A.I. ; Novitskii, N.N. ; Wurtz, G.A. ; Zayats, A.V. ; Viau, G. ; Chaboussant, G. ; Ott, F. ; Gautrot, S. ; Kostylev, M.P. ; Lutsev, L.V. ; Belotelov, V.