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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.3: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Magnetocaloric effect in DyCo₂ and Ho_0.5Dy_0.5Al₂ rare-earth compounds — •E. Bykov^1,2, T. Gottschall¹, A. Karpenkov³, K. Skokov⁴, S. Taskaev^5,6,7, Y. Skourski¹, and J. Wosnitza^1,2 — ¹Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany — ²Institut für Festkörper- und Materialphysik, TU Dresden, Germany — ³Faculty of Physics, Tver State University, Russia — ⁴Institute of Material Science, TU Darmstadt, Germany — ⁵Departament of Physics, Chelyabinsk State University, Russia — ⁶National University of Science and Technology MISiS, Russia — ⁷National Research South Ural State University, Russia

Two of the most promising materials for magnetic gas liquefaction are the rare-earth compounds of the type RCo₂ and RAl₂, which have the so-called Laves phase crystal structure, in which the ferri- or ferromagnetic order appears at low temperatures [1]. In this work, we will present our recent results on the magnetocaloric effect of DyCo₂ and Ho_0.5Dy_0.5Al₂ in pulsed magnetic fields. Both compounds demonstrate large adiabatic temperature changes over a wide temperature window near their Curie temperatures (143 K for DyCo₂ and 44 K for Ho_0.5Dy_0.5Al₂). Especially the usage of Ho_0.5Dy_0.5Al₂ is interesting for a final stage of H₂ liquefaction in magnetic refrigerator devices. This work was supported by the Helmholtz Association via the Helmholtz-RSF Joint Research Group Project No. HRSF-0045.

[1] A. Kitanovski et. al, Int. J. Refrig. 57, 288 (2015)