Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Soft and hard permanent magnets

MA 50.4: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, EB 301

Magnetic properties of iron based 1:12 permanent magnets from first principles — •Olga Yu. Vekilova, Olle Eriksson, and Heike C. Herper — Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

The iron-rich compounds are very promising for permanent magnet applications because of their large magnetic moments, rather high coercivity and sufficiently high Curie temperature. The 1:12 compounds with the ThMn₁₂-type structure are among the best candidates. However, light rare earths and iron cannot be stabilized in a binary 1:12 compound without a third dopant, like Ti or V. Such substitution results in a significant decrease in the saturation magnetization of the compound and can also influence magnetocrystalline anisotropy and Curie temperature. We addressed the problem from first principles. Starting from the known stable NiFe₁₁Ti and SmFe₁₀V₂ phases we tried to improve the magnetic properties by reducing the content of Ti and V respectively. The phase stabilities of NdFe_11−xTi_x and SmFe_10−xV_x were calculated and compared to the available experimental data. We further substituted Nd in NdFe_11−xTi_x, partially by Y, which is a light 4d element, and revealed how the content of Nd and Ti can improve the magnetocrystalline anisotropy.