Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 50: Joint Session "Spincaloric Transport" (jointly with TT)

MA 50.2: Vortrag

Freitag, 30. März 2012, 09:45–10:00, EB 301

Anisotropy of the Seebeck effect and anomalous Nernst effect from Kubo linear response formalism — •S Wimmer, D Ködderitzsch, and H Ebert — Universität München, Department Chemie, Butenandtstr. 5-13, D-81377 München, Germany

Employing the linear response Kubo formalism [1] implemented using the relativistic multiple scattering Korringa-Kohn-Rostoker technique we study the anisotropy of the Seebeck effect (ASE) and the anomalous Nernst effect (ANE) in ferromagnetic cubic transition-metal alloys. The diagonal and off-diagonal elements of the thermoelectric tensor, Seebeck and Nernst coefficients, respectively, are derived from Kubo-Greenwood transport calculations by use of Mott’s formula for the thermopower [2]. Results for the ASE are discussed in comparison to the corresponding electric field-driven effect, the anisotropic magneto-resistance (AMR). The ANE is analogously compared to calculations of its galvanomagnetic counterpart, the anomalous Hall effect (AHE). The chemical disorder of the investigated alloys is treated on the level of the coherent potential approximation (CPA). As will be shown, a corresponding description of the Spin Seebeck effect can be achieved by making use of a relativistic spin projection scheme [3].

[1] S. Lowitzer, D. Ködderitzsch and H. Ebert, PRL 105, 266604 (2010). [2] N.F. Mott and H. Jones, The Theory of the Porperties of Metals and Alloys, (Oxford University Press, Oxford, 1936), chap. 7. [3] S. Lowitzer, D. Ködderitzsch and H. Ebert, PRB 82, 140402(R) (2010).