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MA: Fachverband Magnetismus

MA 2: Magnetic Materials I

MA 2.6: Talk

Monday, March 7, 2016, 10:45–11:00, H31

Searching room temperature martensite phases of Fe-Mn-Ga — Johannes Kroder, •Semih Ener, Konstantin P. Skokov, and Oliver Gutfleisch — Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany

For the search of new permanent magnet materials a bulk high-throughput method is needed. One possible candidate for bulk high-throughput screening is simple and low-cost reactive crucible melting method. The tetragonal phases of the Heusler alloys may show potential as a permanent magnet material. In this work we successfully applied the reactive crucible melting method to the Ni-Mn-Ga and Fe-Mn-Ga ternary Heusler systems. The room temperature ternary phase diagram of Fe-Mn-Ga is reported for a specific composition region. The most interesting observed hard magnetic material is Mn_38.5Fe_32.5Ga₂₉ with the remanent magnetization of 20 Am²kg⁻¹ and a coercivity of 0.33 T. Observed relatively high coercivity (without any exchange bias effect) shows the possibility of using the Heusler-type materials as hard magnetic materials.