Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.17: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Large magnetocaloric effect in Ni₂Cr_xMn_(1.4−x)In_0.6 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, Ni₂Cr_xMn_(1.4−x)In_0.6. Based on the widely studied Ni₂Mn_1.4In_0.6, 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 T_ad, 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 Ni₂Cr_0.1Mn_1.3In_0.6 alloy exhibits Δ T_ad=5 K at T₀=315 K and a large adiabatic temperature change of Δ T_ad=−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).