Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 50: Permanent Magnets

MA 50.2: Vortrag

Donnerstag, 19. März 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 Eriksson^1,3 — 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 REFe_12−xZ_x with RE = Nd, Y, Ce, Sm; Z = Ti, V aiming to tune the magnetic performance towards large uniaxial magnetocrystalline anisotropy and high T_C 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, YFe_11.5Ti_0.5N, and Nd_0.5Y_0.5Fe₁₁Ti(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).