Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Magnetic Materials II
MA 30.2: Talk
Wednesday, March 18, 2015, 15:15–15:30, H 0112
Finite-temperature magnetism and transport properties of FeRh — •Sergiy Mankovsky1, Svitlana Polesya1, Kristina Chadova1, Diemo Ködderitzsch1, Jan Minar1, Julie B. Staunton2, and Hubert Ebert1 — 1Dept. Chemie/Physikalische Chemie, Universität München, Butenandtstr. 5-13, D-81377 München, Deutschland — 2Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
The finite temperature magnetic properties of the FeRh compound with B2 structure have been investigated by performing first-principles electronic structure calculations in combination with Monte Carlo simulations. The central role of the temperature dependence of the inter-atomic exchange interactions for the AFM-FM phase transition at ≈ 340 K is demonstrated, where the Jij(T) dependence is determined by the degree of magnetic order in the system. The finite temperature electric conductivity has been calculated using the scheme based on the alloy analogy model. Investigation of separate contributions to the electric conductivity shows explicitly the strongly dominating role of thermal spin fluctuations. The influence of impurities and intermixing between Fe and Rh sub-lattices on the magnetic and transport properties is investigated. The results are compared with the experimental data showing rather good agreement.