Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.9: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Spin-polarized current through the half-metallic Heusler alloy NiMnSb — •Andreas Prinz-Zwick and Rui-Jing Zhang — Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Spintronics is an important field of research because of the various possible applications for such devices, for example, transistors and storage media. Heusler alloys are most interesting in this regard because of their half-metallic properties. In this context, we investigate the spin resolved transmission through the Heusler alloy NiMnSb. The calculation of the band structure of NiMnSb as well as the structural optimization were done using Density Functional Theory as implemented in the SIESTA program. The transport setup contains two semi-infinite leads of gold and a layer of NiMnSb with variable thickness in between. For the calculation of the transport properties we used the SMEAGOL program for electronic transport, which utilizes non-equilibrium Green's functions to calculate the transmission coefficient and the Landauer formula to calculate the current. We find highly spin-polarized currents even with very thin layers of NiMnSb, for example, the spin polarization already exceeds 90% for two unit cells.