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- W3185320361 abstract "Topological magnetic textures are of great interest in various scientific and technological fields. To allow for precise control of nanoscale magnetism, it is of great importance to understand the role of intrinsic defects in the host material. Here we use conventional and time-resolved Lorentz microscopy to study the effect of grain size in polycrystalline permalloy films on the pinning and gyration orbits of vortex cores inside magnetic nanoislands. To assess static pinning, we use in-plane magnetic fields to shift the core across the island while recording its position. This enables us to produce highly accurate two-dimensional maps of pinning sites. Based on this technique, we can generate a quantitative map of the pinning potential for the core, which we identify as being governed by grain boundaries. Furthermore, we investigate the effects of pinning on the dynamic behavior of the vortex core using stroboscopic Lorentz microscopy, harnessing a new photoemission source that accelerates image acquisition by about two orders of magnitude. We find characteristic changes to the vortex gyration in the form of increased dissipation and enhanced bistability in samples with larger grains." @default.
- W3185320361 created "2021-08-02" @default.
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- W3185320361 date "2022-01-11" @default.
- W3185320361 modified "2023-09-25" @default.
- W3185320361 title "Pinning and gyration dynamics of magnetic vortices revealed by correlative Lorentz and bright-field imaging" @default.
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- W3185320361 doi "https://doi.org/10.1103/physrevresearch.4.013027" @default.
- W3185320361 hasPublicationYear "2022" @default.
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