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MA: Fachverband Magnetismus

MA 9: Spincaloric Transport (jointly with TT)

MA 9.12: Vortrag

Montag, 11. März 2013, 18:00–18:15, H22

Ab-initio study of the temperature dependent electron transport through magnetic nanostructures — •Roman Kováčik, Phivos Mavropoulos, Daniel Wortmann, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Recent developments in the field of the spin caloritronics have triggered many questions about the origin and character of the observed phenomena (e.g., spin-dependent Seebeck versus spin Seebeck effect [1]). To contribute to the understanding of the underlying mechanisms at the microscopic level, we investigate spin-dependent electron transport through various magnetic nanostructures between non-magnetic leads as a function of the temperature. The electronic structure of the studied systems is calculated within the multiple scattering screened Korringa-Kohn-Rostoker (KKR) Green function framework [2]. The Monte-Carlo methodology is then used to simulate the effect of temperature on the magnetic configurations with the exchange coupling parameters calculated according to [3]. Finally, the Landauer-Büttiker approach for the ballistic transport within the KKR framework [4] is extended to account for the non-collinear magnetic effects. Support from the DFG (SPP 1538) is gratefully acknowledged.
[1] G.E.W. Bauer et al., Nature Mater. 11, 391 (2012).
[2] N. Papanikolaou et al., J. Phys. Condens. Matter 14, 2799 (2002),
[2] also see: www.kkr-gf.org.
[3] A.I. Liechtenstein et al., J. Magn. Magn. Mater. 67, 65 (1987).
[4] Ph. Mavropoulos et al., Phys. Rev. B 69, 125104 (2004).