Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Spin-dependent Transport Phenomena
MA 4.9: Talk
Monday, March 26, 2012, 11:45–12:00, H 1012
Magnetotransport properties of Pd-rich PdFe alloys: effect of chemical ordering — •Josef Kudrnovsky1, Ilja Turek2, Vaclav Drchal1, and Sergei Khmelevskii3 — 1Institute of Physics AS CR, Prague — 2Institute of Physics of Materials AS CR, Brno — 3CMS, University of Technology, Vienna
The electronic structure and transport properties of Pd-rich PdFe alloys are investigated as a function of the atomic and magnetic orders. The densities of states, magnetic moments, residual resistivites, anisotropic magnetoresistances (AMR), and the anomalous Hall effect (AHE) are calculated from first-principles. The atomic order is characterized by an amount of antisite Pd-Fe disorder on Pd- and Fe-sublattices. Both stoichiometric Pd3Fe and non-stoichiometric Pd(70)Fe(30) alloys are studied. The electronic structure is determined in the framework of the TB-LMTO method in which the effect of disorder is described by the coherent potential approximation (CPA). The conductivity tensor from which the AMR and AHE are calculated, is determined from relativistic generalization of the transport Kubo-Greenwood approach. The effect of the thermal magnetic disorder on the resistivity and the AMR has been studied in the framework of the disordered local moment approach based on CPA. Our results are in an overall good agreement with available experimental data.