Magnetic neutron scattering; Magnetic nanoparticle; Dipolar interaction
Résumé :
[en] We present small-angle neutron scattering (SANS) data for the temperature variation of the recently observed dipole-field-induced spin-misalignment scattering in the soft magnetic nanocomposite Nanoperm (Fe89Zr7B3Cu1). The associated clover-leaf-shaped angular anisotropy of the SANS pattern, which is due to spin disorder arising from dipolar stray fields of the iron nanoparticles, persists up to several hundred Kelvin above the decoupling point of the intergranular amorphous matrix phase. This observation, in conjunction with the q-dependence of the scattering, suggests the existence of long-range magnetic correlations between the iron particles through the paramagnetic matrix, in agreement with previous investigations. The characteristic wavelength of the dipole-field-induced spin disorder appears to be temperature independent.
Disciplines :
Physique
Identifiants :
UNILU:UL-ARTICLE-2010-474
Auteur, co-auteur :
MICHELS, Andreas ; - Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Vecchini, C.; - Physics Department, National Research Centre, University of Modena and Reggio Emilia, Italy
Moze, O.; - Physics Department, National Research Centre, University of Modena and Reggio Emilia, Italy
Suzuki, K.; - Department of Materials Engineering, Monash University, Melbourne, Australia
Pranzas, P. K.; - GKSS Research Centre, Geesthacht, Germany
Kohlbrecher, J.; - Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
Weissmüller, J.; - Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Karlsruhe, Germany
Langue du document :
Anglais
Titre :
Temperature dependence of dipole-field scattering in Nanoperm
