Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 56: Bulk Materials: Soft and hard permanent magnets

MA 56.8: Talk

Thursday, March 23, 2017, 17:00–17:15, HSZ 403

A systematic study of RE lean ThMn₁₂-type phases — •Heike C. Herper, Olga Vekilova, and Olle Eriksson — Department of Physics and Astronomy, Uppsala University, Sweden

The demand for high performance magnets increases with the increasing usage of renewable energies, e.g. wind power plants. New magnets with lower content of rare earth (RE) compared to todays Fe-Nd-B magnets are needed. Rare earth lean systems such as REFe_12−xM_x in the ThMn₁₂ structure are viewed as good alternatives because their RE content is much smaller and high anisotropies can be reached with interstitial nitrogen atoms. Even though these systems have been investigated for years systematic only few systematic studies exist which analyze the dependence of the magnetic properties on the concentration of the stabilizing element and the optimal N content in detail.

Here a series of REFe_12−xM_xN_y phases with M = Ti, V and RE = Nd and Y has been systematically investigated with density functional theory methods in view of phase stability and magnetic properties depending on the amount of M and N. The geometry has been optimized using the VASP code and magnetic properties have been calculated within the full potential LMTO code RSPt [1] treating the 4f electron as a spin-polarized core electron.

[1] J. M. Wills et al, Full-Potential Electronic Structure Method, Vol. 167, Springer series in solid state science (2010).

This work is supported by NOVAMAG (EU686056) and STandUP for energy (Sweden).