Tunneling magneto thermo power in magnetic tunnel junction nanopillars

Details Tunneling magneto thermo power in magnetic tunnel junction nanopillars Tunneling magneto thermo power in magnetic tunnel junction nanopillars

2011-04-04

arxiv.org/abs/1104.0537v2

Phys. Rev. Lett. 107, 177201 (2011)

Physics

Condensed Matter

Materials Science

Revised version containing additional data and analyis. 13 pages, 3 figures

Scientific paper

We study the tunneling magneto thermo power (TMTP) in CoFeB/MgO/CoFeB magnetic tunnel junction nanopillars. Thermal gradients across the junctions are generated by a micropatterned electric heater line. Thermo power voltages up to a few tens of \muV between the top and bottom contact of the nanopillars are measured which scale linearly with the applied heating power and hence with the applied temperature gradient. The thermo power signal varies by up to 10 \muV upon reversal of the relative magnetic configuration of the two CoFeB layers from parallel to antiparallel. This signal change corresponds to a large spin-dependent Seebeck coefficient of the order of 100 \muV/K and a large TMTP change of the tunnel junction of up to 90%.

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