Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 14: General Spintronics
MA 14.11: Talk
Monday, March 16, 2020, 17:45–18:00, HSZ 401
Ab-initio calculations of transport properties of doped permalloy: exploring the effect of the host disorder — •Ondrej Sipr1,2, Sebastian Wimmer3, Sergey Mankovsky3, and Hubert Ebert3 — 1Institute of Physics, Czech Academy of Sciences, Praha — 2NTC, University of West Bohemia, Pilsen, Czech Republic — 3Ludwig-Maximilians-Universität München, Germany
The transport properties of permalloy Fe0.19Ni0.81 (Py) doped with V, Co, Pt, and Au have been explored by evaluating the Kubo-Bastin formula within the ab-initio KKR Green function framework, both for zero and for finite temperatures. It is demonstrated that the fact that the Py host is not crystalline but randomly disordered has profound consequences. Transverse conductivities characterizing the anomalous Hall effect (AHE) and the spin Hall effect (SHE) are found to be not proportional to the longitudinal conductivity for low dopant concentrations; consequently, the dependence of the AHE and SHE on the dopant concentration cannot be unambigously ascribed to skew scattering, side-jump scattering, or intrinsic contributions in the same way as it can be done for a crystalline host.
Several relationships between quantities are considered. The longitudinal charge conductivity decreases with increasing dopant concentration and the rate of this decrease depends on the dopant type, following the sequence Co-Au-Pt-V, in accordance with the scattering properties of each atom type. The dependence of the AHE and SHE conductivities on the dopant concentration is found to be non-monotonic and strongly dependent on the temperature.