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MA: Fachverband Magnetismus

MA 30: Magnetic Materials II

MA 30.6: Talk

Wednesday, March 18, 2015, 16:15–16:30, H 0112

Large magnetic anisotropy in LaCo_5−x — •Christoph Schwöbel¹, Konstantin Skokov¹, Michael Kuzmin², and Oliver Gutfleisch^1,3 — ¹TU Darmstadt, Germany — ²IM2NP, Marseille, France — ³Fraunhofer IWKS, Hanau, Germany

One focus in the search for new hard magnetic materials are compounds which exhibit a large magneto-crystalline anisotropy as the anisotropy field represents the upper limit for the potential coercive field in a permanent magnet. Materials which crystallize in a hexagonal structure like the CaZn₅-structure can exhibit an easy axis along the c-direction with a relatively high anisotropy field. The investigated LaCo₅ system is particularly interesting as the magnetic moment comes solely from the Co atoms. Therefore it is possible to gain further insight on the magnetism of this 3d element.
Single crystals with a substoichiometric composition of LaCo_5−x were grown and investigated. The measurements were performed up to 14 T at different temperatures. Anisotropy fields larger than 20 T were extrapolated.