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Magnetic nanoswitch for thermoelectric voltages
Date:10/24/2011

therefore possible to control the electric current flowing through the magnetic tunnel structure efficiently by simply switching the magnetisation.

The work carried out by the PTB researchers now shows that, besides the electric current, also the thermal current flowing through the tunnel structure can be influenced by switching the magnetisation. In their experiments, the scientists generated a temperature difference between the two magnetic layers and investigated the electric voltage (the so-called "thermoelectric voltage") generated hereby. It turned out that the thermoelectric voltage depends on the magnetic orientation of the two layers nearly as strongly as the electric resistance. By switching the magnetisation, it is therefore possible to control the thermoelectric voltage and, ultimately, also the thermal current flowing through the specimen.

In future, this new effect could be applied, for example, by using and converting the energy of waste heat occurring in integrated circuits in a targeted way. Furthermore, the discovery of this so-called "tunnel magneto thermoelectric voltage" is a milestone in the research field "spin calorics" a field developing at a fast pace which is currently promoted by the Deutsche Forschungsgemeinschaft (DFG) within the scope of a large-scale, 6-year priority programme.


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Contact: Dr. Hans Werner Schumacher
hans.w.schumacher@ptb.de
49-053-159-22500
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert  

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Magnetic nanoswitch for thermoelectric voltages
Magnetic nanoswitch for thermoelectric voltages
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