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MA: Fachverband Magnetismus

MA 42: Magnetic Materials III

MA 42.10: Vortrag

Donnerstag, 3. April 2014, 17:30–17:45, HSZ 04

Direct measurement of the magnetocaloric effect in La(Fe,Si,Co)₁₃ compounds in pulsed magnetic fields — •M. Ghorbani^1,2, Y. Skourski¹, K.P. Skokov³, M.D. Kuz’min³, O. Gutfleisch³, and J. Wosnitza^1,2 — ¹Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden — ²Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — ³Institut für Materialwissenschaft, TU Darmstadt, Germany

We report on direct measurements of the magnetocaloric effect (MCE) of La(Fe,Si,Co)₁₃ compounds, which are promising candidates for magnetic refrigeration applications as they undergo a metamagnetic transition associated with substantial entropy change. The nature of the transition can be changed from first to second order. Further, the temperature of the transition is tunable by varying the Co concentration. We have measured the MCE for two compounds with different Co concentrations with transition temperatures of 199 K (first order) and 254 K (second order). At low fields the former compound shows a higher MCE, but at the maximum field of 50 Tesla both compounds yield similar temperature changes of about 15 K.