Reference : Temperature dependence of dipole-field scattering in Nanoperm
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Temperature dependence of dipole-field scattering in Nanoperm
Michels, Andreas mailto [- 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]
Journal of Magnetism and Magnetic Materials
Elsevier Science
Yes (verified by ORBilu)
The Netherlands
[en] Magnetic neutron scattering ; Magnetic nanoparticle ; Dipolar interaction
[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.

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