# Transmission XMCD-PEEM imaging of an engineered vertical FEBID cobalt nanowire with a domain wall

## TL;DR

This study demonstrates the use of transmission XMCD-PEEM to image and analyze domain walls in engineered vertical cobalt nanowires, overcoming surface imaging limitations and enabling three-dimensional magnetic structure characterization.

## Contribution

First application of transmission XMCD-PEEM to vertical nanostructures, revealing magnetic configurations and domain wall pinning in engineered FEBID cobalt nanowires.

## Key findings

- Confirmed presence of domain walls in vertical nanowires
- Demonstrated shadow mode XMCD-PEEM for 3D magnetic imaging
- Showed pinning sites influence domain wall positioning

## Abstract

Using focused electron-beam-induced deposition (FEBID), we fabricate vertical, platinum-coated cobalt nanowires with a controlled three-dimensional structure. The latter is engineered to feature bends along the height: these are used as pinning sites for domain walls, the presence of which we investigate using X-ray Magnetic Circular Dichroism (XMCD) coupled to PhotoEmission Electron Microscopy (PEEM). The vertical geometry of our sample combined with the low incidence of the X-ray beam produce an extended wire shadow which we use to recover the wire's magnetic configuration. In this transmission configuration, the whole sample volume is probed, thus circumventing the limitation of PEEM to surfaces. This article reports on the first study of magnetic nanostructures standing perpendicular to the substrate with XMCD-PEEM. The use of this technique in shadow mode enabled us to confirm the presence of a domain wall (DW) without direct imaging of the nanowire.