Size effect on the hysteresis characteristics of a system of interacting core/shell nanoparticles

TL;DR

This study models how size and interfacial exchange interactions influence the hysteresis properties of Fe/Fe3O4 core/shell nanoparticles, revealing size-dependent increases and nonmonotonic behavior of magnetic characteristics.

Contribution

It introduces a new model analyzing the effects of size and exchange interaction on hysteresis in core/shell nanoparticles, supported by experimental validation.

Findings

Hysteresis characteristics increase with nanoparticle size.

Hc and Mrs vary nonmonotonically with interfacial exchange interaction.

Magnetic interactions cause a decrease in Hc and Mrs, confirmed experimentally.

Abstract

We have developed a model for the interacting ore/shell nanoparticles, which we used to analyze the dependence of the coercive field Hc, the remanent saturation magnetization Mrs and the satu- ration magnetization Ms on the interfacial exchange interaction between the core and the shell, the size of the nanoparticles and their interaction for Fe/Fe3O4 nanoparticles have been carried out. It has been shown that the hysteresis characteristics increase together with the size of nanoparticles. Hc and Mrs are changing nonmonotonic when the constant interfacial exchange interaction changes from negative to positive values. In the system of core/shell nanoparticles, magnetic interaction results in Hc and Mrs dropping, which was conformed by experiments. Usage: Secondary publications and information retrieval purposes.