Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.4: Talk
Thursday, March 20, 2025, 15:45–16:00, H16
Nanostructure and Coercivity Mechanism of Single-Phase Ce(Co0.8Cu0.2)5.4 — •Tatiana Smoliarova1, András Kovács2, Nikita Polin3, Esmaeil Adabifiroozjaei4, Shangbin Shen4, Xinren Chen3, Leopoldo Molina-Luna4, Oliver Gutfleisch4, Konstantin Skokov4, Michael Farle1, Baptiste Gault3, and Rafal E. Dunin-Borkowski2 — 1Faculty of Physics and Center for Nanointegration, Universität Duisburg-Essen, Duisburg, Germany — 2Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany — 3Max-Planck-Institut für Nachhaltige Materialien GmbH, Düsseldorf 40237, Germany — 4Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany
CeCo5 rare-earth RCo5 permanent magnets achieve high coercivity (HC = 1 T) upon the addition of Cu up to 20%, making Ce-based magnets an abundant R-alternative to Sm-based magnets. Here, we report a study that employs TEM in conjunction with APT to investigate the Ce(Co0.8Cu0.2)5.4 magnet, prepared by induction melting followed by controlled heat treatment and water quenching. The process results in the formation of a cellular structure characterized by elongated along the c-axis, Cu-rich precipitates with a diameter of ∼ 5 nm and a length of ∼ 20 nm, surrounded by a Cu-poor matrix with a thickness of ∼ 10 nm. The alignment of the Cu-rich precipitates creates a preferential direction for zigzag-shaped domain walls, yielding effective pinning and HC = 1 ± 0.05 T. Financial support by DFG, CRC/TRR 270 (project ID 405553726) is acknowledged.
Keywords: Rare-earth magnets; Transmission electron microscopy; Atom probe tomography; Electron holography; Magnetic contrast