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journal article·2018-11-01Open access

Unusual angular dependence of tunneling magneto-Seebeck effect

Christian Heiliger, Michael Czerner, Niklas Liebing, Santiago Serrano-Guisan, Karsten Rott, Günter Reiss, Hans W. Schumacher

AIP Advances· Volume 8· Issue 11
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Source abstract

Abstract

We find an unusual angular dependence of the tunneling magneto-Seebeck effect (TMS). The conductance shows normally a cosine-dependence with the angle between the magnetizations of the two ferromagnetic leads. In contrast, the angular dependence of the TMS depends strongly on the tunneling magneto resistance (TMR) ratio. For small TMR ratios we obtain also a cosine-dependence whereas for very large TMR ratios the angular dependence approaches a step-like function. The origin is that the cosine-dependent transmission function enters in the denominator of the definition of the Seebeck coefficient. Although the TMR and TMS are disconnected with respect to their magnitude the size of the TMR effect can be deducted from the angular dependence of the TMS effect.
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Research context

OpenAlex topics: Quantum and electron transport phenomena · Atomic and Subatomic Physics Research · Physics of Superconductivity and Magnetism

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institut für Theoretische Physik, Justus Liebig University 1 , Heinrich-Buff-Ring 16, 35392 Giessen, Germany

Department of Physics, Martin Luther University Halle-Wittenberg 2 , Von-Danckelmann-Platz 3, 06120 Halle, Germany

TDK Headway Technologies Inc 3 , 682 South Hillview Drive, Milpitas, California 95035, USA

Department of Physics, Universität Bielefeld 4 , P,O, Box 100 131, 33501 Bielefeld, Germany

Physikalisch-Technische Bundesanstalt 5 , Bundesallee 100, 38116 Braunschweig, Germany

Funding

Deutsche Forschungsgemeinschaft

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