Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.26: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Spin structure analysis on Fe₂AlB₂ powder and single-crystals — •Joachim Landers¹, Niels Kubitza², Soma Salamon¹, Ulf Wiedwald¹, Christina Birkel^2,3, and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen — ²Department of Chemistry and Biochemistry, TU Darmstadt — ³School of Molecular Sciences, Arizona State University

The MAB phase Fe₂AlB₂ exhibits ferromagnetic ordering below the Curie temperature T_C ≈ 290 K, showing a strong magnetocaloric effect close to room temperature, which makes it a promising candidate for magnetic cooling applications. We utilize Mössbauer spectroscopy under high magnetic fields to analyze the spin structure and ferro- to paramagnetic phase transition of Fe₂AlB₂ microparticle powders. Field- and temperature-dependent measurements on an Fe₂AlB₂ single-crystal sanded down to appropriate thickness for transmission experiments are used as reference and allow for specific characterization along easy and hard magnetic directions with regards to magnetic alignment. Funding by the DFG via CRC/TRR 270 (project number 405553726, subprojects B02, B03, and B05) is gratefully acknowledged. We thank T. Ouisse and H. Pazniak (LMGP, Grenoble) for providing single crystals.

Keywords: magnetic particles; Mössbauer spectroscopy; MAB phases; magnetocaloric effect