Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 75: Poster Session: Transport 1

TT 75.14: Poster

Thursday, March 23, 2017, 15:00–19:00, P2-EG

Transmission through half-metallic NiMnSb under consideration of defects and correlations — •Andreas Prinz-Zwick, Wilhelm Appelt, Liviu Chioncel, and Ulrich Eckern — Universität Augsburg

Half-metallic materials are of particular importance for achieving spin dependent transport properties for various spintronic applications. We study a (001) oriented heterostructure of epitaxial grown NiMnSb on Au and evaluate the transmission within the combined Density Functional and Non-Equilibrium Greens Function (NEGF) theory, implemented in SMEAGOL. The calculations include lattice defects such as vacancies and exchange of atoms. In addition the calculation for the clean system is compared with DFT+DMFT to quantify the influence of electronic correlations. Electronic correlations induce minority spin states in the half-metallic gap and significantly reduce the spin polarization of bulk NiMnSb. Surprisingly no significant change is seen in the transmission coefficient. These results demonstrate the localized nature of the many-body induced states in the half-metallic gap.