Magnetic dynamics in suspensions of ferrimagnetic platelets

Dense dispersions of ferrimagnetic bariumhexaferrite nanoplatelets form colloidal nematic phases even in the isotropic solvent such as n-butanol. The transition into the nematic phases is marked by developing the long-range orientational and magnetic correlations between the particles. Here we explore the magnetic dynamics in such dispersions in the range of the isotropic and nematic phases. We demonstrate that even in the low concentration isotropic regime, a simple Debye-type mechanism cannot describe the dynamics. Clustering of the particles results in low-frequency contributions.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study explores the magnetic dynamics of ferrimagnetic bariumhexaferrite nanoplatelets in the isotropic and nematic phases. The results show that a simple Debye-type mechanism cannot explain the dynamics, even in the low concentration isotropic regime.