THERMAL VARIATION OF THE RELAXATION-TIME OF THE MAGNETIC-MOMENT OF GAMMA-FE2O3 NANOPARTICLES WITH INTERPARTICLE INTERACTIONS OF VARIOUS STRENGTHS

Authors
DORMANN JL DORAZIO F LUCARI F TRONC E PRENE P JOLIVET JP FIORANI D CHERKAOUI R NOGUES M
Citation
Jl. Dormann et al., THERMAL VARIATION OF THE RELAXATION-TIME OF THE MAGNETIC-MOMENT OF GAMMA-FE2O3 NANOPARTICLES WITH INTERPARTICLE INTERACTIONS OF VARIOUS STRENGTHS, Physical review. B, Condensed matter, 53(21), 1996, pp. 14291-14297
Citations number
20
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
53
Issue
21
Year of publication
1996
Pages
14291 - 14297
Database
ISI
SICI code
0163-1829(1996)53:21<14291:TVOTRO>2.0.ZU;2-T
Abstract
The dynamical properties of gamma-Fe2O3 particles, dispersed in a poly mer, were investigated by ac susceptibility (2x10(-2) Hz less than or equal to nu less than or equal to 10(4) HZ) Mossbauer spectroscopy mea surements. The variation of the average blocking temperature as a func tion of the measuring time is satisfactorily described by a model whic h accounts for interparticle interactions by a statistical calculation of the dipolar energy for a disordered assembly of particles with a v olume distribution and easy axes in random position.