Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.86: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Electronic strucure and finite-temperature magnetic properties of FeRh — •Sergiy Mankovsky¹, Svitlana Polesya¹, Jan Minar¹, Catherine Bordel², Cristian Back³, and Hubert Ebert¹ — ¹Dept. Chemie/Physikalische Chemie, Universität München, D-81377 München, Deutschland — ²Department of Physics, University of California, Berkeley, California 94720, USA — ³Department of Physics, Universität Regensburg, 93040 Regensburg, Deutschland

The temperature-induced magnetic phase transitions in FeRh, AFM→FM (≈ 340 K) and FM→PM (≈ 670 K) have been investigated by Density Functional Theory (DFT) electronic structure calculations using the fully relativistic Korringa-Kohn-Rostoker Green function (KKR-GF) method. First-principles exchange coupling parameters, J_ij, have been used to determine the temperature dependent magnetic properties of FeRh within Monte Carlo simulations based on Heisenberg model. The Gilbert damping parameter calculated for the FM state as a function of temperature is in a good agreement with the experimental results. Separate calculations with temperature-induced structure disorder only as well as structure and magnetic disorder accounting for together allow to make a conclusion about the role of spin fluctuations for the Gilbert damping. The temperature dependent magnetic anisotropy has been investigated for FeRh films grown on two different substrates. The calculations demonstrate the strain induced spin-reorientation transition for both FeRh films across the AFM-FM phase transition, that is in a good agreement with experiment.