Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Caloric Effects in Ferromagnetic Materials
MA 22.6: Talk
Wednesday, March 19, 2025, 10:45–11:00, H19
Direct measurements of the adiabatic temperature change of a dysprosium single crystal — •E. Bykov1, T. Gottschall1, J. Wosnitza1,2, C. Salazar Mejia1, M. D. Kuz’min3, Y. Mudryk4, and D. L. Schlagel4 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Technische Universität Dresden, Dresden, Germany — 3Aix-Marseille Université, IM2NP, Marseille, France — 4Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, USA
Heavy rare-earth elements in the Gd-Tm series have unique magnetic properties due to their electronic structure. The exchange between 4f electrons occurs via RKKY interactions and, therefore, is extremely sensitive to the ionic radii of the elements, exhibits anisotropy, and shows pronounced magnetoelastic coupling. This leads to various magnetic phase diagrams with different helicoidal magnetic structures despite similar chemical and physical properties of the 4f elements. The high total angular momentum enables significant magnetocaloric effects, which is relevant for magnetic refrigeration applications. Gadolinium, for instance, exhibits a notable magnetocaloric effect at room temperature, serving as a comparative standard. Prior research at the Dresden High Magnetic Field Laboratory demonstrated record magnetocaloric effects in terbium. Holmium’s broad plateau in Δ Tad at 5 T suggests potential in cryogenic applications, such as for hydrogen liquefaction. Continuing our study of the magnetocaloric effect of the 4f elements, we present our recent results for a dysprosium single crystal.
Keywords: Heavy rare earths; Dysprosium; High magnetic fields; Direct adiabatic temperature change measuremnets