Magnetization patterns in $\text{GaAs}$-$\text{Fe}_{\text{33}}\text{Co}_{\text{67}}$ core-shell nanorods

TL;DR

This study investigates the static magnetic properties of individual GaAs-FeCo core-shell nanorods, revealing complex magnetic textures and the influence of external magnetic fields on their magnetization orientations.

Contribution

It introduces a detailed analysis of magnetic textures in GaAs-FeCo nanorods using advanced microscopy techniques, highlighting the effects of designed anisotropy and external fields.

Findings

Identification of two types of in-plane magnetic domains.

External magnetic fields can induce azimuthal magnetization components.

Magnetic textures are influenced by the nanorods' curved surface and anisotropy.

Abstract

We present a study on the static magnetic properties of individual $\text{GaAs}$-$\text{Fe}_{\text{33}}\text{Co}_{\text{67}}$ core-shell nanorods. X-ray Magnetic Circular Dichroism combined with Photoemission Electron Microscopy (XMCD-PEEM) and Scanning Transmission X-ray Microscopy (STXM) were used to investigate the magnetic nanostructures. The magnetic layer is purposely designed to establish a magnetic easy axis neither along a high symmetry nor mirror axes to promote 3D magnetic helical order on the curved surface. In practice, two types of magnetic textures with in-plane magnetization were found inside the nanostructures' facets: magnetic domains with almost longitudinal or almost perpendicular magnetization with respect to the axis of the tube. We observe that a magnetic field applied perpendicular to the long axis of the nanostructure can add an azimuthal component of the magnetization to the previously almost longitudinal magnetization.