Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Spin Hall Effects
MA 3.4: Vortrag
Montag, 31. März 2014, 10:15–10:30, HSZ 403
Colossal spin Hall effect in ultrathin noble metal films — •Christian Herschbach1, Dmitry Fedorov1, Martin Gradhand2, and Ingrid Mertig3,1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom — 3Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany
The application of the spin Hall effect (SHE) in spintronics devices requires materials with a large spin Hall angle (SHA). This quantity describes the conversion efficiency from a charge current into a spin current. Recently, Niimi et al. [1] measured a large SHA (∼20%) in thin film Cu(Bi) alloys. Such a giant SHE was predicted by ab initio calculations of the skew-scattering mechanism in bulk Cu with substitutional Bi impurities [2]. We extended the method to the film geometry and showed the SHE to be significantly increased in one monolayer (ML) noble metal films with Pt impurities with respect to related bulk systems [3].
Here, we resume our study and show that Bi impurities in 1ML noble metal films can generate a SHA of up to 80% caused by skew scattering. This colossal SHE can be attributed to scattering at relativistic p1/2 impurity states.
[1] Y. Niimi et al., PRL 109, 156602 (2012)
[2] M. Gradhand et al., PRL 104, 186403 (2010)
[3] C. Herschbach et al., PRB 85 195133 (2012)