Magnetic bubbles in FePd thin films near saturation

TL;DR

This paper investigates the structure of magnetic bubbles and vertical Bloch lines in FePd thin films using LTEM imaging and multiscale simulations, revealing details about magnetization reversal regions and singularities within domain walls.

Contribution

It provides a detailed analysis of the structure of domain walls and vertical Bloch lines in FePd thin films through combined experimental and simulation approaches.

Findings

Identification of magnetization reversal areas inside domain walls.

Observation of magnetic singularities within vertical Bloch lines.

Correlation between LTEM images and simulation results.

Abstract

The structure of domain walls delimiting magnetic bubbles in L10 FePd thin layers is described on the basis of Lorentz transmission electron microscopy (LTEM) and multiscale magnetic simulations. Images obtained by high resolution LTEM show the existence of magnetization reversal areas inside domain walls, called vertical Bloch lines (VBLs). Combining these observations and multiscale simulations on various geometries, we can identify the structure of these VBLs, notably the presence or not of magnetic singularities.