Effect of mechanical stresses on the coercive force of the heterophase non-interacting nanoparticles

TL;DR

This paper theoretically investigates how uniaxial mechanical stresses influence the coercive force of heterophase non-interacting nanoparticles, revealing that stretching decreases coercivity while compression increases it, with effects modulated by interfacial exchange interaction.

Contribution

It provides a theoretical model analyzing the impact of mechanical stress on coercive force in heterophase nanoparticles, highlighting the role of interfacial exchange interaction.

Findings

Stretching decreases coercive force

Compression increases coercive force

Interfacial exchange interaction causes nonmonotonic variation

Abstract

The theoretical analysis of the effect of uniaxial stress on the magnetization of the system of noninteracting nanoparticles is done by an example of heterophase particles of maghemite, epitaxially coated with cobalt ferrite. It is shown that stretching leads to a decrease in the coercive force $H_c$, and compression leads to its growth. The residual saturation magnetization $I_{rs}$ of nanoparticles does not change. With increasing of interfacial exchange interaction, coercive force varies nonmonotonically