Direct measurements of the magnetocaloric effect in pulsed magnetic fields: The example of the Heusler alloy Ni$_{50}$Mn$_{35}$In$_{15}$
| Autor: | Zavareh, M. Ghorbani, Mejía, C. Salazar, Nayak, A. K., Skourski, Y., Wosnitza, J., Felser, C., Nicklas, M. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Appl. Phys. Lett. 106, 071904 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4913446 |
| Popis: | We have studied the magnetocaloric effect (MCE) in the shape-memory Heusler alloy Ni$_{50}$Mn$_{35}$In$_{15}$ by direct measurements in pulsed magnetic fields up to 6 and 20 T. The results in 6 T are compared with data obtained from heat-capacity experiments. We find a saturation of the inverse MCE, related to the first-order martensitic transition, with a maximum adiabatic temperature change of $\Delta T_{ad} = -7$ K at 250 K and a conventional field-dependent MCE near the second-order ferromagnetic transition in the austenitic phase. The pulsed magnetic field data allow for an analysis of the temperature response of the sample to the magnetic field on a time scale of $\sim 10$ to 100 ms which is on the order of typical operation frequencies (10 to 100 Hz) of magnetocaloric cooling devices. Our results disclose that in shape-memory alloys the different contributions to the MCE and hysteresis effects around the martensitic transition have to be carefully considered for future cooling applications. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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