Regensburg 2013 – scientific programme
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MA: Fachverband Magnetismus
MA 48: Spin-dependent Transport Phenomena
MA 48.10: Talk
Friday, March 15, 2013, 12:00–12:15, H23
Anomalous Hall effect and its anisotropy in disordered tetragonal Fe-Co alloys — •Ilja Turek1, Josef Kudrnovsky2, and Vaclav Drchal2 — 1Institute of Physics of Materials, Acad. Sci. Czech Rep., Brno, Czech Republic — 2Institute of Physics, Acad. Sci. Czech Rep., Prague, Czech Republic
We present results of ab initio calculations of zero-temperature transport properties for disordered body-centered tetragonal (bct) Fe-Co alloys by using the fully relativistic TB-LMTO method, the coherent potential approximation (CPA) and the Kubo-Středa formula [1]. Particular attention has been paid to the anomalous Hall conductivity (AHC) and to the alloy composition around 60 at.% Co, for which an enhanced value of the uniaxial magnetic anisotropy energy was predicted and observed in strained Fe-Co films [2]. We have found that the AHC values for the magnetization direction pointing along the tetragonal a and c axes can differ nearly three times for certain tetragonal distortions and alloy compositions. This anisotropy exceeds that calculated for pure tetragonal Fe and Co metals and it seems to be surprisingly stable with respect to the alloy disorder. Further aspects of the predicted behavior including its possible experimental verification will also be briefly discussed. [1] I. Turek et al., Phys. Rev. B 86, 014405 (2012). [2] I. Turek et al., arXiv:1210.1028 (2012).