abstract

• Linear response methods allow studying magnetic susceptibility relaxation in isotropic colloidal magnetic fluids. We show a relationship between the susceptibility of macroscopic magnetization at thermal equilibrium and the diffusion constant of a tracer particle. The comparison of the predicted frequency-dependent susceptibility with computer simulations shows their agreement. Besides, at a low concentration of particles, it has the expected Debye behavior. However, the initial susceptibility yields only the qualitative trends of the existing experiments at a low volume fraction of particles and its temperature dependence. © 2022, Revista Mexicana de Fisica. All Rights Reserved.

publication date

• 2022-01-01

funding provided via

• Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, CINVESTAV  Grant

published in

• Revista Mexicana de Fisica  Journal

keywords

• Ferrofluid; Linear response; Magnetic susceptibility; Nanoparticles

Digital Object Identifier (DOI)

• 10.31349/RevMexFis.68.031003

PubMed ID

start page

end page

volume

• 68

issue

• 3