Giant spin-dependent thermoelectric effect in magnetic tunnel junctions

Weiwei Lin (), Michel Hehn, Laurent Chaput, Béatrice Negulescu, Stéphane Andrieu, François Montaigne and Stéphane Mangin ()
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Weiwei Lin: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
Michel Hehn: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
Laurent Chaput: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
Béatrice Negulescu: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
Stéphane Andrieu: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
François Montaigne: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.
Stéphane Mangin: Institut Jean Lamour, Nancy-Université, Boulevard des Aiguillettes, BP 239, Vandoeuvre-lès-Nancy 54506, France.

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract Thermoelectric effects in magnetic nanostructures and the so-called spin caloritronics are attracting much interest. Indeed it provides a new way to control and manipulate spin currents, which are key elements of spin-based electronics. Here we report on a giant magnetothermoelectric effect in a magnetic tunnel junction. The thermovoltage in this geometry can reach 1 mV. Moreover a magnetothermovoltage effect could be measured with ratio similar to the tunnel magnetoresistance ratio. The Seebeck coefficient can then be tuned by changing the relative magnetization orientation of the two magnetic layers in the tunnel junction. Therefore, our experiments extend the range of spintronic devices application to thermoelectricity and provide a crucial piece of information for understanding the physics of thermal spin transport.

Date: 2012
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DOI: 10.1038/ncomms1748

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