Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Poster III
MA 47.16: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster D
Advanced transmission electron microscopy of the three-dimensional magnetization distribution of a pinned domain wall in a Sm-Co-based permanent magnet — Aurys Šilinga1, Trevor P Almeida1, •András Kovács2, Ziyuan Rao3, Tatiana Smoliarova4, Konstantin P Skokov5, Baptiste Gault3, Oliver Gutfleisch5, Michael Farle4, and Rafal E Dunin-Borkowski2 — 1School of Physics and Astronomy, University of Glasgow, United Kingdom — 2Ernst Ruska-Centre, Forschungszentrum Jülich, Germany — 3Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 4Faculty of Physics and Center for Nanointegration, Universität Duisburg-Essen, Duisburg, Germany — 5Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany
Sm(CoFeCuZr)7 permanent magnets have a high energy product and are commonly used in applications at elevated temperature. Their high coercivity results in part from the pinning of magnetic domain walls at Sm2Co17 and SmCo5 phase boundaries. Here, we use the advanced transmission electron microscopy technique of electron holographic tomography, in combination with model-based reconstruction, to measure the three-dimensional magnetization distribution at a pinned domain wall in a needle-shaped sample of the permanent magnet Sm(CoFeCuZr)7 . The results are discussed by considering both the shape and the magnetocrystalline anisotropy of the sample, as well local variations of its microstructure and chemical composition.
Financially supported by CRC/TRR 270 (HoMMage), Project-No. 405553726-TRR 270.
Keywords: electron microscopy; domain wall; permanent magnet