Title

Two Mechanisms And A Scaling Relation For Dynamics In Ferrofluids

Abstract

Two relaxation peaks were found in the complex susceptibility of ferrofluids. Both can be described by the Vogel-Fulcher law τ = τ0f(T)exp[E/k(T − T0)]. Nevertheless, the physical origins for these two relaxations are quite different. We found that Néel relaxation strongly depends on the dipole-dipole interaction. The dramatic dependence can be described by a surprisingly simple scaling relation: τ = τ0 exp[E/k(T − T0)], where φ 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. © 1996 The American Physical Society.

Publication Date

1-1-1996

Publication Title

Physical Review Letters

Volume

77

Issue

2

Number of Pages

390-393

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevLett.77.390

Socpus ID

0041670033 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0041670033

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