SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Caloric Effects in Ferromagnetic Materials
MA 42.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, HSZ 04
Multicaloric effect and exploited hysteresis in the Heusler alloy Ni-Mn-Sn-Fe-Co — •T. Niehoff1,2, T. Gottschall1, C. Salazar Mejia1, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik TUD, Dresden, Germany
Today’s research on commercial magnetocaloric cooling focuses on reducing the hysteresis of materials with first-order phase transitions. In contrast, this work exploits the width of hystereses to achieve more effective cooling performance with a combination of multiple caloric effects and investigates the coupling between the magnetocaloric and elastocaloric effects. The hysteresis is finetuned by substituting the proper amount of Fe and Co in the Heusler alloy Ni-Sn. To study the material, simultaneous magnetization, strain, and adiabatic temperature changes are compared at a range of different initial temperatures and various uniaxial loads in pulsed magnetic fields up to 50 T.