Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Spin dependent Transport Phenomena
MA 29.3: Vortrag
Dienstag, 21. März 2017, 14:30–14:45, HSZ 403
Ab initio calculation of thermal dependent anomalous Hall effect — •David Wagenknecht, Karel Carva, and Ilja Turek — Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
Anomalous Hall effect (AHE) is directly connected to nondiagonal elements of the electrical conductivity tensor. Therefore, it is an important phenomenon bringing fundamental information about solid materials. A large change in the AHE may be used, e.g., to define a binary information leading to a construction and switching of antiferromagnetic structures like memories [1]. Thus, the knowledge of the AHE is essential at the room temperatures, where the devices should operate.
We have calculated electrical transport properties including the AHE from the first principles and incorporated thermal disorder. Fully relativistic linear muffin-tin orbital (LMTO) approach with the coherent potential approximation (CPA) was used [2] and the effect of non-zero temperature was described by a frozen lattice displacements [3]. Nickel and simple nickel-based alloys (nonstochiometric Cu1−xNix and Co1−xNix) were used to verify our approach that may now be applied to more complex materials (semi-Heusler NiMnSb, antiferromagnet CuMnAs, ...).
[1] N. Kiyohara et al. Phys. Rev. Applied 5, 064009 (2016)
[2] K. Carva et al. Phys. Rev. B 73, 144421 (2006)
[3] D. Wagenknecht et al. In Šafránková, Jana; Pavlů, Jiří. WDS’15 Proceedings of Contributed Papers - Physics. : Matfyzpress (2015). s. 42*47. ISBN 978-80-7378-311-2.