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Dynamical magnetic behavior of interactingγ‐Fe 2 O 3 particles
Author(s) -
Fiorani D.,
Dormann J. L.,
Lucari F.,
D'Orazio F.,
Tronc E.,
Jolivet J. P.
Publication year - 1998
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(199805)12:5<381::aid-aoc734>3.0.co;2-7
Subject(s) - superparamagnetism , chemistry , anisotropy energy , anisotropy , condensed matter physics , particle (ecology) , magnetic anisotropy , relaxation (psychology) , dipole , magnetic relaxation , interaction energy , chemical physics , statistical physics , magnetization , physics , magnetic field , molecule , quantum mechanics , psychology , social psychology , oceanography , organic chemistry , geology
The dynamical behavior of γ‐Fe 2 O 3 particles dispersed in a polymer have been investigated by a.c. susceptibility and Mössbauer 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. © 1998 John Wiley & Sons, Ltd.