Abstract
Ferromagnetic nanowires and nanotubes present unique properties due to shape anisotropy, forming a magnetic texture controlled by particle dimensions. The motion of their Bloch-point domain walls may reach velocities above 1 km/s, presenting unique opportunities in spintronics. The ordering and dynamics in those systems is nevertheless affected by microstructural and chemical variations at few-nm scales, leading to unexpected phenomena. This includes domain wall pinning or a dominant azimuthal anisotropy. Research on this topic has so far been hampered by limitations of conventional magnetic microscopy, which cannot reach the needed resolution and offer low accessibility. To solve those issues, my project aims to establish electron ptychography as a novel magnetic imaging technique, capable of reaching resolutions at or below the nm level, while showing unprecedented reproducibility. This will entail developments along two main directions, each relying on a specific and unique experimental setup. The first will enable straightforward and fast measurements, relying on low-cost SEM. The second will explore the capacities for 3D reconstructions and super-resolution. By those means, I will thus introduce new cutting-edge solutions to study magnetic nanoparticle systems.
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