Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.17: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Large magnetocaloric effect in Ni2CrxMn(1.4−x)In0.6 Heusler alloys — •C. Salazar-Mejia1, P. Devi2, S. Singh3, C. Felser2, and J. Wosnitza1 — 1High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, India
In the search for promising magnetocaloric materials for solid-state refrigeration, we have successfully prepared a new family of Heusler alloys, Ni2CrxMn(1.4−x)In0.6. Based on the widely studied Ni2Mn1.4In0.6, we have substituted Cr for Mn tuning the structural and the ferromagnetic transition towards lower temperatures. All samples show a structural transition at a temperature located between 200 and 300 K. Here, we present our results on the adiabatic temperature change, Δ Tad, in these compounds under applied magnetic-field pulses of 2 and 6 T. The samples exhibit a large inverse magnetocaloric effect (temperature decrease under field application) due to the martensitic transition and a conventional effect (temperature increase under field application) due the ferromagnetic transition. For instance, the Ni2Cr0.1Mn1.3In0.6 alloy exhibits Δ Tad=5 K at T0=315 K and a large adiabatic temperature change of Δ Tad=−7 K at T0=270 K under first field application and −5.7 K after second field application, for a field change of 6 T.
[1]M. Ghorbani Zavareh et al., Appl. Phys. Lett. 106, 071904 (2015).