Title

Two mechanisms and a scaling relation for dynamics in ferrofluids

Authors

Authors

J. L. Zhang; C. Boyd;W. L. Luo

Comments

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Abbreviated Journal Title

Phys. Rev. Lett.

Keywords

AC SUSCEPTIBILITY; GLASS-TRANSITION; MAGNETIC FLUIDS; SPIN-GLASSES; Physics, Multidisciplinary

Abstract

Two relaxation peaks were found in the complex susceptibility of ferrofluids. Both can be described by the Vogel-Fulcher law tau = tau(0)f(T) exp[E/k(T - T-0)]. Nevertheless, the physical origins for these two relaxations are quite different. We found that Neel relaxation strongly depends on the dipole-dipole interaction. The dramatic dependence can be described by a surprisingly simple scaling relation: tau = tau(0) exp[E/k(T - a phi(0.8))], where phi is the volume fraction of the dipoles. In contrast, Brownian relaxation is much less sensitive to the concentration of magnetic moments because the interparticle force is mainly hydrodynamic in nature.

Journal Title

Physical Review Letters

Volume

77

Issue/Number

2

Publication Date

1-1-1996

Document Type

Article

Language

English

First Page

390

Last Page

393

WOS Identifier

WOS:A1996VA31800010

ISSN

0031-9007

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