SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 42: Caloric Effects in Ferromagnetic Materials
MA 42.5: Vortrag
Donnerstag, 30. März 2023, 16:00–16:15, HSZ 04
Effect of Pt substitution on the reversibility of the magnetocaloric effect in Ni-Pt-Mn-In Heusler alloys — •Parul Devi1, C. Salazar-Mejia1, S. Singh2, and J. Wosnitza1, 3 — 1High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, India — 3Institut für Festkörper –und Materialphysik, TU Dresden, Germany
Among different magnetic shape memory Heusler alloys, Ni2Mn1.4In0.6 is one of the most studied system for multiple caloric effects. However, obstacles such as the low-temperature martensitic transition and large thermal hysteresis hinder its technological applications motivating the search for novel materials showing better mechanical properties as well as higher martensitic transition temperature [1 and references within]. Here, we will present the experimental results such as the crystal structure determined by x-ray diffraction, magnetization in static magnetic fields, and the adiabatic temperature change in pulsed magnetic field of quaternary Ni2−xPtxMn1.4In0.6 (0 ≤ x ≤ 0.2) shape memory alloys. The substitution of Pt affects the geometric compatibility condition without changing the space group symmetry of the austenite and the martensite phase. Around the martensitic transition temperature, a large value of Δ Tad was found in pulsed magnetic fields due to the compatibility of austenite and martensite phase.
[1] K. K. Dubey et al., J. Magn. Magn. Mat. 507, 166818 (2020).