Magnetic properties of bi-phase micro- and nanotubes

TL;DR

This paper investigates the magnetic configurations of bi-phase micro- and nanotubes with a ferromagnetic core, spacer, and shell, providing analytical phase diagrams to understand their stability based on geometry.

Contribution

It introduces analytical expressions for the energy of bi-phase tubes and maps their magnetic phase diagrams, advancing understanding of their magnetic stability.

Findings

Phase diagrams of magnetic configurations are established.

Analytical energy expressions are derived for bi-phase tubes.

Magnetic stability depends on geometric parameters.

Abstract

The magnetic configurations of bi-phase micro- and nanotubes consisting of a ferromagnetic internal tube, an intermediate non-magnetic spacer, and an external magnetic shell are investigated as a function of their geometry. Based on a continuum approach we obtained analytical expressions for the energy which lead us to obtain phase diagrams giving the relative stability of characteristic internal magnetic configurations of the bi-phase tubes.