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TT: Fachverband Tiefe Temperaturen

TT 85: Spincaloric Transport II (organized by MA)

TT 85.6: Vortrag

Donnerstag, 3. April 2014, 11:00–11:15, HSZ 04

Spin disorder effect on the spin-caloric transport properties in magnetic nanostructures from first principles — •Roman Kováčik, Phivos Mavropoulos, Daniel Wortmann, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

An important contribution to the thermoelectric and spin-caloric transport properties in magnetic materials at elevated temperatures is the formation of a spin-disordered state due to the local moment fluctuations. This effect has not been largely investigated so far. We focus on various magnetic nanostructures, motivated by the miniaturization of spintronics devices and by recent suggestions that magnetic nanostructures can lead to extraordinary thermoelectric effects due to quantum confinement [1]. The electronic structure of the studied systems is calculated within the multiple scattering screened Korringa-Kohn-Rostoker Green function (KKR-GF) framework [2]. The Monte-Carlo methodology is used to simulate the effect of temperature induced spin disorder and the transport properties are evaluated from the transmission probability obtained using the Landauer-Büttiker approach for the ballistic transport within the KKR-GF framework [3]. We find qualitative and quantitative changes in the thermoelectric and spin-caloric coefficients in the case that spin-disorder is included in the calculation. Support from the DFG (SPP 1538) is gratefully acknowledged.

[1] N. Vu et al., APEX 4, 015203 (2011).
[2] N. Papanikolaou et al., JPCM 14, 2799 (2002), also see: kkr-gf.org.
[3] Ph. Mavropoulos et al., PRB 69, 125104 (2004).