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Three-Dimensional Neutron Far-Field Tomography of a Bulk Skyrmion Lattice
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Three-Dimensional Neutron Far-Field Tomography of a Bulk Skyrmion Lattice
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Paper
Three-Dimensional Neutron Far-Field Tomography of a Bulk Skyrmion Lattice
2022
Overview
Skyrmions are topologically-protected spin textures thought to nucleate and annihilate on points of vanishing magnetization, called Bloch points. However, owing to a lack of bulk techniques, experimental visualizations of skyrmion lattices and their stabilization through defects in three-dimensions remain elusive. Here, we present a tomographic algorithm applied to a Co\\(_8\\)Zn\\(_8\\)Mn\\(_4\\) skyrmion lattice host, processing multi-projection small angle neutron scattering measurements to generate mean scattering feature reconstructions (MSFR) of the bulk spin textures. Digital phantoms validated the algorithm; reconstructions of the sample show a disordered skyrmion lattice with a topological saturation of 63~\\%, exhibiting three-dimensional topological transitions through two different emergent (anti)monopole defect pathways with densities of 147~\\(\\)m\\(^-3\\) and 21~\\( m^-3\\) for branching and segmentation events, respectively. Our techniques produce experimentally-informed visualizations of bulk skyrmion lattice structures and defects, enabling future bulk studies over a wide variety of sample shapes and chemistries, magnetic phases, and external parameters.
Publisher
Cornell University Library, arXiv.org
Subject
