Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Soft and hard permanent magnets
MA 50.1: Vortrag
Donnerstag, 15. März 2018, 15:00–15:15, EB 301
Improving magnetic properties of Ce-Fe permanent magnets with La doping — •Martin Hoffmann1,2, Munehisa Matsumoto2, Takashi Miyake3, and Hisazumi Akai2 — 1Institute for Theoretical Physics, Johannes Kepler University Linz, Austria — 2Institute for Solid State Physics, University of Tokyo, Japan — 3National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
Powerful permanent magnets are a crucial component in electric motors and gen- erators, while the most powerful magnets available nowadays are alloys of rare-earth (RE) elements and magnetic transition metal elements. Unfortunately, the availability of the RE elements of the best magnets is strongly limited. Therefore, different paths are undertaken in order to find better or cheaper permanent magnets. We study theoretically the effect of La and Co doping on the magnetic properties of potentially cheaper Ce-Fe permanent magnets with 1-2, 1-5, or 1-12 composition.
We studied the magnetic moments, coupling, anisotropy and the Curie temperature. These quantities and their dependence on the doping have to be at first better understood and in a second step optimized for a good performance of the magnets. We found significant changes in the calculated magnetic properties when mixing Ce with La and Fe with Co. Looking at the formation energy of the compounds identifies possible stable concentration regimes where new compounds could be synthesized.