Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.31: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Reversibility of minor hysteresis loops in magnetocaloric Heusler alloys — •T. Gottschall^{1, 2}, E. Stern-Taulats³, Ll. Mañosa³, A. Planes³, K. P. Skokov¹, O. Gutfleisch¹, Y. Skourski², and J. Wosnitza² — ¹TU Darmstadt, Institute of Material Science, Germany — ²High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Departament de Fisica de la Materia Condensada, Facultat de Fisica, Universitat de Barcelona, Spain

The unavoidable existence of thermal hysteresis in these magnetocaloric materials is one of the central challenges limiting their implementation in cooling devices. Transforming the material in minor loops of the thermal hysteresis, however, allows achieving significant reversible effects even when the hysteresis is relatively large. In this work, we focus on the magnetocaloric properties of Heusler alloys under cycling. We compare thermometric measurements of the adiabatic temperature change in low magnetic fields and pulsed field experiments with calorimetric measurements of the isothermal entropy change when moving in minor hysteresis loops driven by magnetic fields [1, 2].

Support of DFG (SPP1599) is gratefully acknowledged.

[1] T. Gottschall et al., Phys. Rev. Applied 5 (2016) 024013.

[2] T. Gottschall et al., Appl. Phys. Lett. 110 (2017) 223904.