Dynamic response of a magnetic suspension in a viscoelastic fluid

Abstract

We present a model to describe a dynamic orientational response of a dilute suspension of single-domain magnetic particles in a viscoelastic liquid carrier of the Maxwell fluid type. Introducing Brownian orientational diffusion into the equation of the particle rotary motion, absorption spectra of the initial dynamic magnetic susceptibility are obtained. Under appropriate conditions they display a complex comblike structure which might be helpful for probing the local rheology of the carrier medium of a suspension. \textcopyright{} 1996 The American Physical Society.