Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions

Niklas Liebing; Santiago Serrano-Guisan; Patryk Krzysteczko; Karsten Rott; Günter Reiss; Jürgen Langer; Berthold Ocker; Hans Werner Schumacher

doi:10.1063/1.4811737

Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions

Mesoscale and Nanoscale Physics 2015-06-15 v1 Materials Science

Authors: Niklas Liebing , Santiago Serrano-Guisan , Patryk Krzysteczko , Karsten Rott , Günter Reiss , Jürgen Langer , Berthold Ocker , Hans Werner Schumacher

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Abstract

We study the tunneling magneto thermopower and tunneling magneto thermocurrent of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ). The devices show a clear change of the thermoelectric properties upon reversal of the magnetisation of the CoFeB layers from parallel to the antiparallel orientation. When switching from parallel to antiparallel the thermopower increases by up to 55% where as the thermocurrent drops by 45%. These observations can be well explained by the Onsager relations taking into account the tunneling magneto resistance of the MTJ. These findings contrast previous studies on AlO based MTJ systems, revealing tunneling magneto thermo power but no tunneling magneto thermocurrent.

Keywords

magnetic tunnel junctions tunneling magneto thermocurrent tunneling magneto thermopower CoFeB/MgO/CoFeB onsager relations spintronics thermoelectric properties

Cite

@article{arxiv.1304.4798,
  title  = {Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions},
  author = {Niklas Liebing and Santiago Serrano-Guisan and Patryk Krzysteczko and Karsten Rott and Günter Reiss and Jürgen Langer and Berthold Ocker and Hans Werner Schumacher},
  journal= {arXiv preprint arXiv:1304.4798},
  year   = {2015}
}

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9 pages, 3 figures

Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions

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