Small-angle X-ray resonant magnetic scattering at the Co M$_{2,3}$ and L$_3$ edges observed with photoemission electron microscopy - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2024

Small-angle X-ray resonant magnetic scattering at the Co M$_{2,3}$ and L$_3$ edges observed with photoemission electron microscopy

Résumé

X-ray magnetic circular dichroism is an efficient contrast mechanism allowing for a direct sensitivity to magnetization. Combined with an imaging technique such as photoemission electron microscopy, it has been successfully applied to high-resolution investigations of ferromagnetic thin films but also of three-dimensional systems thanks to the transmission-type contrast in their shadow. Our focus in this work is the wave-optics scattering pattern that can be observed near such a shadow's rim. Taking advantage of non-uniform magnetic states present in near-micron-size Co$_{1-x}$Gd$_x$ beads, we first show how X-ray resonant magnetic scattering affects the Fresnel diffraction at the Co L$_3$ edge. In order to confirm this observation, we then turn to the Co M$_{2,3}$ edges. There, we measure magnetic scattering patterns with a significantly increased spatial extent (due to the larger wavelength), despite the signal's weakness. The patterns' origin is supported by a comparison between our experimental data and a simple analytical model, then numerical simulations.
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Dates et versions

hal-04453284 , version 1 (12-02-2024)

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Alexis Wartelle, Marisel Di Pietro Martínez, Olivier Fruchart, Philippe David, Guillaume Beutier. Small-angle X-ray resonant magnetic scattering at the Co M$_{2,3}$ and L$_3$ edges observed with photoemission electron microscopy. 2024. ⟨hal-04453284⟩
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