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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.29: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

Direct Measurements of the Magneto-Caloric Effect of MnFe4Si3 in Pulsed Magnetic Fields — •Nour Maraytta¹, Yurii Skourski², Jörg Voigt¹, Karen Friese¹, Jörg Persson¹, Salman Salman³, and Thomas Brückel¹ — ¹Jülich Centre for Neutron Science JCNS-2 and Peter Grünberg Institute PGI-4, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — ²Dresden High Magnetic Field Laboratory HLD, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden. — ³Physics Department, Al-Quds University, Abu Dis, Palestine

Magnetocaloric Effect forms the basis of magnetocaloric refrigeration technology which is an energy-efficient and environmentally friendly method for cooling [1]. A large single crystal of MnFe4Si3 was grown; this allows one to determine the crystal and magnetic structure of the compound reliably [2].

In this contribution, we will present the direct measurements of ΔTad in pulsed magnetic fields up to 50T using a home-built experimental set-up from HLD [3]. This technique provides nearly adiabatic conditions during the measurements. The results show that the material can by reversibly cycled which is an important requirement for the applications. We will also compare the results to the ones obtained from magnetization measurements in static magnetic fields using PPMS.

[1] K.A. Gschneidner Jr. and V.K. Pecharsky, Int. J. Refrig. 2008, 31, 945 * 961. [2] P. Hering, K. Friese, J. Voigt et.al., Chem. Mat. 2015, 27, 7128-7136. [3] M. G. Zavareh, C. S. Mejía, A. K. Nayak, et.al., Appl. Phys. Lett. 2015, 106.