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MA: Fachverband Magnetismus
MA 32: Bulk Materials: Soft and Hard Permanent Magnets
MA 32.7: Vortrag
Donnerstag, 8. September 2022, 16:30–16:45, H43
High-throughput and data-mining search for novel rare-earth-free permanent magnets — •Alena Vishina1, Heike Herper1, and Olle Eriksson1,2 — 1Department of Physics and Astronomy, Uppsala University, Se-75120 Uppsala, Sweden — 2School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
Rare-earth (RE) magnetic materials dominate the market when high-performance permanent magnets are needed (e.g. the area of 'green' energy technology, such as electric vehicles and windmills). At the same time, there is a growing interest in RE-free alternatives, since the heavier RE elements are quite expensive and are often mined with methods that leave an environmental footprint. We propose to use the data-mining approach to search for high-performance RE-free/lean magnetic materials. Filtering through a large number of known structures from ICSD database, we are looking for materials with high magnetization M > 1 T, uniaxial MAE > 1 MJ/m3, and Tc >300 K. Sometimes, additional elements alterations are attempted to make the material more cost-effective. Two searches have already been performed. New magnetic material has been found and consequently synthesized by experimental collaborators - Co3Mn2Ge. From the ab-initio calculations, the defect-free material was predicted to have the saturation magnetization of 1.71 T, the uniaxial magnetocrystalline anisotropy of 1.44 MJ/m3, and the Curie temperature of 700 K. Its magnetism depends critically on the amount of disorder of the Co and Ge atoms, a further improvement of the magnetism is possible.