Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 41, Issue 13, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/41/13/134011
Keywords
-
Categories
Ask authors/readers for more resources
Extended dynamics ( broader than Debye relaxation) occurs in fine magnetic particle systems because of the particle size distribution and the influence of interparticle interaction. In dilute negligibly interacting systems the broadening of the relaxation is governed by the effective anisotropy distribution of the particles. In dense systems, however, interparticle interaction alters the nature of the dynamics and phenomena due to correlation of the particle moments appear. The effects may at a glance only look like a change in the effective anisotropy of the individual particles. However, studies of the dynamics over several decades in observation time reveal that correlation related effects dominate the dynamics on long time scales and extend the maximum relaxation time well beyond the relaxation time of the individual particles. In addition, non-equilibrium dynamics, reminiscent of the ageing phenomenon of spin glasses, appears. Results and analyses of ac susceptibility and magnetic relaxation experiments on various fine magnetic particle systems, ranging from concentrated monodispersed ferrofluids to mechanically alloyed granular materials, are used to illustrate the cooperative nature of the dynamics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available