Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 13: Magnetic Materials II
MA 13.1: Talk
Tuesday, March 8, 2016, 09:30–09:45, H31
Phonons and the metamagnetic transition in FeRh — •Michael Wolloch1, Florian Hofer2, Dieter Süss2, and Peter Mohn1 — 1Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria — 2Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria
The meta-magnetic transition, from G-type antiferromagnetic (AFM) to ferromagnetic (FM) order at ∼ 350 K, makes FeRh a very interesting material which could be used, for example, in a layered system in conjunction with FePt for heat assisted magnetic recording media [1,2,3]. Several explanations for the transition have been proposed, but there is still debate over the correct mechanism [4,5,6].
We present DFT calculations using the VASP code of several magnetic configurations of FeRh, including zero point energies and phonons. We find that FeRh is extremely sensitive to the choice of computational parameters and sensible to slight distortions in the lattice. Additionally we conclude that the vibrational zero-point energy is not negligible when considering the energetic hierarchy of different magnetic configurations.
[1] G. Shirane et al., Phys. Rev., 134, A1547 (1964)
[2] J.-U. Thiele et al., Appl. Phys. Lett., 82, 2859 (2003)
[3] D. Süss et al., Appl. Phys. Lett., 89, 113105 (2006)
[4] M. E. Gruner et al., Phys. Rev. B, 67, 064415 (2003)
[5] R. Y. Gu et al., Phys. Rev. B, 72, 012403 (2005)
[6] J. Kudrnovský et al., Phys. Rev. B, 91, 014435 (2015)