Magnetostatic response and field-controlled haloing in binary superparamagnetic mixtures

Autor(en)

Andrey A. Kuznetsov, Sofia S. Kantorovich

Abstrakt

Nowadays, magnetoresponsive soft materials, based not simply on magnetic nanoparticles but rather on multiple components with distinct sizes and magnetic properties in both liquid and polymeric carriers, are becoming more and more widespread due to their unique and versatile macroscopic response to an applied magnetic field. The variability of the latter is related to a complex interplay of the magnetic interactions in a highly nonuniform internal field caused by spatial inhomogeneity in multicomponent systems. In this work, we present a combined analytical and simulation study of binary superparamagnetic systems containing nanoclusters and dispersed single-domain nanoparticles in both liquid and solid carrier matrices. We investigate the equilibrium magnetic response of these systems for wide ranges of concentrations and interaction energies. It turns out that, while the magnetization of a binary solid can be both above and below that of an ideal superparamagnetic gas, depending on the concentration of the dispersed phase and the interparticle interactions, the system in a liquid carrier is highly magnetically responsive. In liquid, a spatial redistribution of the initially homogeneously dispersed phase in the vicinity of the nanocluster is observed, an effect that is reminiscent of the so-called haloing effect previously observed experimentally on micro- and milliscales.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie, Forschungsplattform MMM Mathematics-Magnetism-Materials

Journal

Physical Review E

Band

108

Anzahl der Seiten

11

ISSN

2470-0045

DOI

https://doi.org/10.1103/PhysRevE.108.064603

Publikationsdatum

12-2023

Peer-reviewed

Ja

ÖFOS 2012

103043 Computational Physics

ASJC Scopus Sachgebiete

Condensed Matter Physics, Statistical and Nonlinear Physics, Statistics and Probability

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/611b27fd-65ae-4237-88b7-6d543f9689d4