Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 13: Magnetic Heuslers and Semiconductors
MA 13.7: Vortrag
Montag, 9. März 2026, 16:30–16:45, POT/0361
Manipulating the first-order magnetostructural phase transition in Ni-Mn-Sn Heusler alloy through nano-functionalization — •Johannes Puy1, Nadine Stratmann2, Hamed Shokri3, Bilal Gökce3, Stephan Barcikowski2, Oliver Gutfleisch1, Anna Ziefuss2, and Franziska Scheibel1 — 1TU Darmstadt, Darmstadt, Germany — 2Universität Duisburg-Essen, Essen, Germany — 3BU Wuppertal, Wuppertal, Germany
Ni-Mn-based Heusler alloys are considered as a promising candidate for magnetocaloric or multicaloric cooling applications, as they exhibit an inverse magnetocaloric and conventional elastocaloric effect, which arise from a first-order magnetostructural phase transition (FOMST). However, the practical use of these alloys is limited by the thermal hysteresis associated with the FOMST and their intrinsic brittleness. This work demonstrates a novel approach to tailor the FOMST characteritics and the mechanical stability of spark-plasma-sintered (SPS) Ni-Mn-Sn by nano-functionalization. Silver and zirconium diboride nanoparticles (NP) are synthesized by pulsed laser fragmentation of microparticles (MP-LFL) and subsequently used to functionalize Ni-Mn-Sn powder (150 - 75 µm) at varying mass loadings. This enables targeted modification of the sintered particle interfaces, which act as martensite nucleation sites, but also as origin of fracture under compressive stress. We systematically characterize the influence of NP-functionalization on the microstructure, the temperature-induced FOMST and the mechanical stability. This work was supported by the DFG within the CRC/TRR 270 (Project ID No. 405553726).
Keywords: magnetocaloric; first-order phase transition; martensitic transformation; microstructure; nano-functionalization