2011/04/30 by N. Liebing, Niklas Liebing, S. Serrano-Guisan +5 · 1 citation
Physics and Astronomy · #Antiparallel (mathematics) #Condensed matter physics #Ferromagnetism #Magnetic field #Magnetic properties of thin films #Materials science #Nanopillar #Nanostructure #Nanotechnology #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum tunnelling #Seebeck coefficient #Thermoelectric effect #Tunnel junction #Tunnel magnetoresistance #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.107.177201
published as Phys. Rev. Lett. 107, 177201 (2011) · Revised version containing additional data and analyis. 13 pages, 3 figures
arxiv created 2011/07/01 · openalex publication_date 2011/10/17 · arxiv updated 2012/09/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study tunneling magnetothermopower (TMTP) in CoFeB/MgO/CoFeB magnetic tunnel junction nanopillars. Thermal gradients across the junctions are generated by an electric heater line. Thermopower voltages up to a few tens of \ensuremathμV between the top and bottom contact of the nanopillars are measured which scale linearly with the applied heating power and hence the thermal gradient. The thermopower signal varies by up to 10 \ensuremathμV 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 \ensuremathμV/K and a large TMTP change of the tunnel junction of up to 90%.