Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 50: Permanent Magnets
MA 50.2: Talk
Thursday, March 19, 2020, 15:15–15:30, HSZ 101
Computational design of rare-earth lean hard magnetic phases — •Heike C. Herper1, Olga Yu. Vekilova1, Pablo Nieves2, and Olle Eriksson1,3 — 1Department of Physics and Astronomy, Uppsala University, Sweden — 2T4Innovations, VŠB Technical University of Ostrava, Czech Republic — 3School of Science and Technology, Örebro University, Sweden
Today nearly all high performance magnets are based on Nd2Fe14B and the demand for such magnets is increasing. Thus more permanent magnets are needed but the new materials should have a smaller environmental footprint. Fe-rich phases with the ThMn12 structure contain less RE than the commercially used compounds.
We performed a systematic ab initio study of REFe12−xZx with RE = Nd, Y, Ce, Sm; Z = Ti, V aiming to tune the magnetic performance towards large uniaxial magnetocrystalline anisotropy and high TC by using a combination of different state of the art first principles methods combined with atomistic simulation methods for temperature dependent properties. Apart from Sm in practice N must be added to e.g. improve the coercive field. Since especially N can alter the orientation of the easy axis it has been included in the study.
Several promising phases could be identified. Here, YFe11.5Ti0.5N, and Nd0.5Y0.5Fe11Ti(N), and SmFe11V will be discussed. The last one has been already synthesized showing an good magnetic performance.[J. Alloys and compounds 786, 969 (2019)]
This work was supported by NOVAMAG (EU686056) and Swedish Foundation for Strategic Research (EM16-0039).