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MA: Fachverband Magnetismus
MA 51: Caloric Effects in Ferromagnetic Materials
MA 51.5: Vortrag
Freitag, 22. März 2024, 10:45–11:00, H 2013
Multicaloric effect of powder-in-tube Heusler material — •T. Niehoff1,2, L. Beyer3,4, C. Salazar Mejia1, T. Gottschall1, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD- EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research, Dresden, Germany — 4TU Bergakademie Freiberg, Germany
Research on magnetocaloric materials with first-order phase transitions typically focuses on reducing their hysteresis. However, in this presentation, we will discuss an alternative approach by capitalizing on the width of the hysteresis to enhance the cooling performance through the synergistic utilization of multiple caloric effects. The fine tuning of the hysteresis is achieved through the rational substitution of appropriate quantities of Fe and Co within the Ni-Mn-Sn Heusler alloy. In addition, the powder-in-tube method is employed to further enhance performances such as mechanical stability, hysteresis, and the magnetocaloric effect itself. To comprehensively investigate the properties and mechanical stability of the material, we conducted stress-strain measurements and adiabatic temperature changes for different initial temperatures. This analysis was performed under varying uniaxial loads within pulsed magnetic fields, reaching up to 50 T.
Keywords: Magnetocaloric; Heusler; High magnetic field; Pulsed magnetic fields; Multi-calorics