Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Soft and hard permanent magnets

MA 50.2: Vortrag

Donnerstag, 15. März 2018, 15:15–15:30, EB 301

Hard magnetic Fe-Hf-Sb based intermetallic compound of hexagonal Laves phase structure — •Dagmar Goll, Thomas Gross, Ralf Loeffler, Ulrich Pflanz, Tim Vogel, Andreas Kopp, Tvrtko Grubesa, and Gerhard Schneider — Aalen University, Materials Research Institute (IMFAA), Aalen, Germany

Rare earth free phases are searched for possible candidates for novel hard magnets to realize efficient energy converters. By experimental bulk high-throughput screening the ternary system Fe-Hf-Sb, off-stoichiometric (Fe,Sb)_2+xHf_1−x with a composition of Fe60.0-Hf26.5Sb13.5 with potential as hard magnetic phase has been discovered. By quantitative domain structure analysis, interesting intrinsic magnetic properties of J_s ≈ 1 T and K₁ ≈ 1.5 MJ/m³ are estimated at room temperature. By magnetometry, bulk intrinisic properties of J_s ≈ 0.7 T and K₁ ≈ 1.4 MJ/m³ are found from the approach to ferromagnetic saturation. X-ray diffraction analysis proves the presence of hexagonal C14 Laves phase structure. Alloying elements like Co or Mn can modify the crystal structure and ferromagnetic behavior. In addition, rapid quenching is applied to realize nanocrystalline magnetic materials thereof. The project is supported by Ministry of Economic Affairs, Labor and Housing Baden-Wuerttemberg.