Temperature and magnetic field dependence of the internal and lattice structures of skyrmions by off-axis electron holography

TL;DR

This study uses off-axis electron holography to analyze how temperature and magnetic field influence the internal and lattice structures of magnetic skyrmions in FeGe, revealing shape variations and magnetic moment dependencies.

Contribution

It provides detailed insights into the temperature and magnetic field effects on skyrmion structures using electron holography, highlighting shape and magnetic moment variations.

Findings

Internal skyrmion shape varies with magnetic field

Inter-skyrmion distance remains stable in the lattice phase

Magnetic moment amplitude depends on temperature

Abstract

The internal and lattice structures of magnetic skyrmions in B20-type FeGe are investigated using off-axis electron holography. The temperature, magnetic field and angular dependence of the magnetic moments of individual skyrmions are analyzed. Whereas the internal skyrmion shape is found to vary with magnetic field, the inter-skyrmion distance remains almost unchanged in the lattice phase. The amplitude of the local magnetic moment is found to depend on temperature, while the skyrmion shape does not. Deviations from a circular to a hexagonal skyrmion structure are observed in the lattice phase.