On thermal relaxation of magnetic fluid magnetization

C. M. Polunin¹ , A. M. Storozhenko¹ , P. A. Ryapolov¹ , Yu. B. Kazakov² , T. A. Arefyeva² , I. M. Arefyev²

¹ Southwest State University, Kursk, Russia
² Ivanovo State Power Engineering University, Ivanovo, Russia }

Abstract
Results of theoretical and experimental studies of the effect of the perturbation of magnetic fluid magnetization in the initial part of the magnetization curve caused by thermal oscillations in the adiabatic sound wave are discussed. Measurements were made for magnetic colloid samples with different viscosity of the dispersion medium within a frequency range of 20--60 kHz. Comparison of the conclusions on a model of thermal relaxation of magnetization and the experimental results makes it possible to gain information about the rheological features for the surrounding molecular environment of a particle, i.e. nanorheology. Tables 1, Figs 3, Refs 17.