Recently, several groups have reported spin-dependent thermoelectric effects in magnetic tunnel junctions. In this paper, we present a setup for time-resolved measurements of thermovoltages and thermocurrents of a single micro- to nanometer-scaled tunnel junction. An electrically modulated diode laser is used to create a temperature gradient across the tunnel junction layer stack. This laser modulation technique enables the recording of time-dependent thermovoltage signals with a temporal resolution only limited by the preamplifier for the thermovoltage. So far, time-dependent thermovoltage could not be interpreted. Now, with the setup presented in this paper, it is possible to distinguish different Seebeck voltage contributions to the overall measured voltage signal in the μs time regime. A model circuit is developed that explains those voltage contributions on different sample types. Further, it will be shown that a voltage signal arising from the magnetic tunnel junction can only be observed when the laser spot is directly centered on top of the magnetic tunnel junction, which allows a lateral separation of the effects.
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June 2013
Research Article|
June 20 2013
Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction
Alexander Boehnke;
Alexander Boehnke
a)
1Thin Films and Physics of Nanostructures,
Universität Bielefeld
, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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Marvin Walter;
Marvin Walter
b)
2I. Physikalisches Institut,
Georg-August-Universität Göttingen
, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Niklas Roschewsky;
Niklas Roschewsky
2I. Physikalisches Institut,
Georg-August-Universität Göttingen
, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Tim Eggebrecht;
Tim Eggebrecht
2I. Physikalisches Institut,
Georg-August-Universität Göttingen
, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Volker Drewello;
Volker Drewello
1Thin Films and Physics of Nanostructures,
Universität Bielefeld
, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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Karsten Rott;
Karsten Rott
1Thin Films and Physics of Nanostructures,
Universität Bielefeld
, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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Markus Münzenberg;
Markus Münzenberg
2I. Physikalisches Institut,
Georg-August-Universität Göttingen
, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Andy Thomas;
Andy Thomas
1Thin Films and Physics of Nanostructures,
Universität Bielefeld
, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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Günter Reiss
Günter Reiss
1Thin Films and Physics of Nanostructures,
Universität Bielefeld
, Universitätsstrasse 25, D-33615 Bielefeld, Germany
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a)
Electronic mail: boehnke@physik.uni-bielefeld.de
b)
Electronic mail: mwalter1@gwdg.de
Rev. Sci. Instrum. 84, 063905 (2013)
Article history
Received:
March 26 2013
Accepted:
May 30 2013
Citation
Alexander Boehnke, Marvin Walter, Niklas Roschewsky, Tim Eggebrecht, Volker Drewello, Karsten Rott, Markus Münzenberg, Andy Thomas, Günter Reiss; Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction. Rev. Sci. Instrum. 1 June 2013; 84 (6): 063905. https://doi.org/10.1063/1.4811130
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