Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Spin-dependent transport phenomena

MA 54.1: Vortrag

Freitag, 16. März 2018, 08:00–08:15, EB 301

Spin-dependent electrical transport of Heusler alloys at nonzero temperatures from the first principles — •David Wagenknecht, Karel Carva, and Ilja Turek — Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

Novel electrical and spintronic devices are required to operate at real-life conditions and to be reliable in a wide range of temperatures. Halfmetals are promising candidates for applications that manipulates with spin degrees of freedom and one of the most studied materials suitable for such usage are Heusler alloys.

We will present calculations of the electronic structure and electrical transport properties at nonzero temperatures of Heusler alloys like NiMnSb. The temperature-induced disorder, especially phonons, dramatically influence the properties. The approach is based on the fully relativistic tight-binding linear muffin-tin orbital (TB-LMTO) method with the coherent potential approximation (CPA) [1] and we will focus on the spin-dependent properties, e.g., electrical conductivity and spin-polarization [2].

The results will show a combined effect of the chemical, magnetic and temperature-induced disorder and a discussion of an efficiency of the spin-dependent transport for various disorders will be included. It may be used to design novel spintronic devices reliable at, e.g., room temperatures.

[1] K. Carva et al. Phys. Rev. B 73, 144421 (2006)

[2] D. Wagenknecht et al. Proc. SPIE 10357, 103572W (2017)