Two mechanisms and a scaling relation for dynamics in ferrofluids

    Authors

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

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    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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