SUPERPARAMAGNETIC RELAXATION OF WEAKLY INTERACTING PARTICLES

Authors
MORUP S TRONC E
Citation
S. Morup et E. Tronc, SUPERPARAMAGNETIC RELAXATION OF WEAKLY INTERACTING PARTICLES, Physical review letters, 72(20), 1994, pp. 3278-3281
Citations number
39
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
20
Year of publication
1994
Pages
3278 - 3281
Database
ISI
SICI code
0031-9007(1994)72:20<3278:SROWIP>2.0.ZU;2-V
Abstract
The influence of particle interactions on the superparamagnetic relaxa tion time has been studied by Mossbauer spectroscopy in samples of mag hemite (gamma-Fe2O3) particles with different particle sizes and parti cle separations. It is found that the relaxation time decreases with d ecreasing particle interactions. A new model for the influence of inte ractions on the superparamagnetic relaxation has been derived and it i s shown that this model can explain the observations.