Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.83: Poster
Dienstag, 8. März 2016, 09:30–12:30, Poster B1
Magnetic properties of off-stoichiometric Mn-Bi single- and poly-crystals — •Semih Ener1, Yu-Chun Chen2, Konstantin P. Skokov1, Helmut Kronmüller2, Eberhard Goering2, and Oliver Gutfleisch1 — 1Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany — 2Max-Planck-Institut für Intelligente Systeme, 70569 Stuttgart, Germany
Current permanent magnet market is dominated by the high-performance Nd-Fe-B and low-cost hard-ferrite magnets. The rare-earth crisis in 2011 led researchers to focus on two main research topics: i) optimized usage of the rare-earths and ii) developing new hard magnetic materials. The low-temperature-phase (LTP-) MnBi is a promising candidate as a hard magnetic material due to its high theoretical magneto-crystalline anisotropy and positive β coefficient. In this study the single- and poly-crystals of off-stoichiometric Mn-Bi samples are presented. The optimum secondary phase (pure-Bi) concentration in the bulk samples is discussed for achieving reasonable coercivity and remanence values for the final product. The room temperature x-ray diffraction patterns show the LTP-MnBi phase as a main phase and secondary phase of pure-Bi for almost all investigated samples. Magnetic measurements show the possibility to tune the magnetic properties in a wide variety of coercive field and remanence values up to 1.75 T and 0.7 T, respectively. The authors gratefully acknowledge the support of the Deutsche Forschungsgemeinschaft for the project HPPMSNG.