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Dynamical magnetic behavior of interacting­γ-Fe2O3 particles

✍ Scribed by D. Fiorani; J. L. Dormann; F. Lucari; F. D'Orazio; E. Tronc; J. P. Jolivet

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
124 KB
Volume
12
Category
Article
ISSN
0268-2605

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✦ Synopsis

The dynamical behavior of g-Fe 2 O 3 particles dispersed in a polymer have been investigated by a.c. susceptibility and Mo ¨ssbauer spectroscopy measurements. The effect of interparticle interactions on the relaxation time is satisfactorily described by a superparamagnetic model where the dipolar energy is determined by a statistical calculation for a disordered arrangement of particles with volume distribution and easy axes in random orientations. The results indicate that the single particle anisotropy energy is mainly determined by surface anisotropy and that the energy barrier increases with the interaction strength.

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