Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: POSTER Ib
MA 20.43: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Anisotropic interface contributions to the magnetothermoelectric power (MTEP) in Co/Pt layered structures — Axel Frauen, André Kobs, Tim Böhnert, Ann-Kathrin Michel, •Afsaneh Farhadi, Kornelius Nielsch, and Hans Peter Oepen — Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Jungiusstr. 11a, 20355 Hamburg, Germany
We report on the magnetothermoelectric power (MTEP) and magnetoresistance (MR) of Co/Pt films. Regarding the MR measurements, the in-plane rotation of magnetization M reveals the bulk-like anisotropic MR (AMR). The corresponding thermoelectric counterpart is observed in the Seebeck voltage US when an in-plane temperature gradient ∇ T is applied. This is the conventional anisotropic MTEP effect, which is predicted to occur in the Seebeck coefficient S = −US/Δ T according to Mott’s formula [1]: S(M) ∝ [1/ρ(E,M) · dρ(E,M)/dE]E=EF (Fermi energy EF). A linear S(1/ρ) behavior is found revealing that [dρ(E,M)/dE]E=EF does not depend on M in accordance with Ref. [1]. Moreover, we observe that US also depends on the orientation of M within the plane perpendicular to ∇ T. This characteristic is the thermoelectric counterpart of the recently discoverd anisotropic interface MR (AIMR) [2]. Also for the AIMR and its thermoelectric counterpart a linear S(1/ρ) curve is found. Interestingly, both S(1/ρ) curves exhibits different slopes, which implies that [dρ(E,M)/dE]E=EF and therefore the band structure is significantly different for Co/Pt interfaces compared to Co bulk. [1] Avery et al., PRB 86, 184408 (2012), [2] Kobs et al., PRL 106, 217207 (2011).