Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.49: Poster
Friday, March 20, 2020, 09:00–12:00, P2/EG
Large Uniaxial Magnetic Anisotropy of hexagonal Fe-Hf-Sb Alloys — •Maxim Tchaplianka1, Lukáš Kývala1,2, Alexander Shick1, Sergii Khmelevskyi3, and Dominik Legut2 — 1Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic — 2IT4Innovations and Nanotechnology Centre, VSB - Technical University of Ostrava, Ostrava-Poruba, Czech Republic — 3Center for Computational Materials Science, Vienna University of Technology, Vienna, Austria
Chemical engineering of the magnetic anisotropy in ferromagnets via element substitution is a promising method of creating permanent magnets. Recent experiments have shown that antimony substitution into Fe2Hf produces an alloy with the large positive magnetic anisotropy energy necessary for permanent magnets[1]. We investigate the electronic and magnetic properties of Laves phase hexagonal Fe2Hf and Fe-Hf-Sb alloys making use of the density functional theory. The magnetic moments on individual atoms and the total and projected densities of states are calculated. Fe2Hf is shown to be metallic and ferrimagnetic with an easy-plane preferential direction. Antimony substitution is found to suppress the planar magnetization direction and favor the uniaxial magnetic anisotropy, in agreement with experimental observations.
[1] D. Goll et al., Hard Magnetic Off-Stoichiometric (Fe,Sb)2+xHf1−x Intermetallic Phase. Phys. Status Solidi RRL, 11, 1700184 (2017).