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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I

MM 4.8: Vortrag

Montag, 14. März 2011, 12:45–13:00, IFW D

Magnetocaloric effect of Fe_86−xB₁₄Nb_x metallic glasses — •Anja Waske, Björn Schwarz, Norbert Mattern, and Jürgen Eckert — Institut für Festkörper- und Werkstoffforschung (IFW), Dresden

Materials exhibiting the magneto-caloric effect could one day be the basis of a new magnetic cooling concept for consumer use, replacing conventional refrigeration technology. However, currently known materials with high magnetic entropy changes are very expensive and can hence not be applied on mass production scale. Here, we report on the magneto-caloric effect in comparatively cheap Fe-based metallic glasses. Glassy Fe_86−xB₁₄Nb_x ribbons were prepared by rapidly quenching the liquid using the melt spinning technique. By diluting the magnetic lattice with Nb dopants, the Curie temperature decreases and, at highest Nb content, approaches room temperature. However, this effect is accompanied by a decrease of the saturation magnetization. From temperature dependent magnetization measurements the magnetic entropy change was calculated using the thermodynamic Maxwell equations. We will present the experimental results as a function of Nb content and discuss the applicability of the material for cooling purposes.