Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 39: Spin-dependent Transport Phenomena I
MA 39.2: Talk
Thursday, March 19, 2015, 09:45–10:00, H 0112
Enhancement of the anomalous Hall effect in ternary alloys — •Katarina Tauber1, Albert Hönemann1, Dmitry Fedorov2,1, Martin Gradhand3, and Ingrid Mertig1,2 — 1Martin Luther University Halle-Wittenberg — 2Max Planck Institute of Microstructure Physics, Halle — 3University of Bristol
We present our results for the anomalous Hall effect (AHE) in ternary alloys of the form Cu(Mn1−wTw) with T as nonmagnetic Au, Bi, Ir, Lu, Sb, or Ta impurities. As was shown experimentally [1], Mn causes negligible skew scattering in copper and therefore a very weak AHE is observed in the Cu(Mn) binary alloys. In contrast, the systems Cu(T) have a strong skew scattering, but only provide a spin Hall effect (SHE) instead of an AHE, since the systems are nonmagnetic. Fert et al. [1] found that the AHE can be strongly enhanced in the Cu(Mn) alloys via the co-doping of 5d-impurities. Furthermore, they showed that it is possible to describe the SHE in the Cu(T) alloy via measurements of the AHE in the Cu(Mn1−wTw) alloys. Here, a theoretical study via Matthiessen’s rule is presented with focus on the connection between the AHE in the ternary alloy and the SHE in the related Cu(T) alloy. Our formalism provides the conditions for a maximal enhancement of the AHE with respect to the weighting factor w. This is underpinned by first-principles calculations using a relativistic Korringa-Kohn-Rostoker method and Boltzmann transport theory [2].
[1] A. Fert et al., JMMM 24, 231 (1981).
[2] K. Tauber et al., Phys. Rev. B 87, 161114(R) (2013).