2011/04/11 by Michael Czerner, Michael Bachmann, Michaël Bachmann +1
Physics and Astronomy · #Magnetic properties of thin films #Quantum and electron transport phenomena #Surface and Thin Film Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.83.132405
published as Phys. Rev. B 83, 132405 (2011) · 6 pages, 5 figures
arxiv created 2011/04/11 · openalex publication_date 2011/04/18 · arxiv updated 2011/04/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
This Letter presents ab initio calculations of the magneto-thermoelectric power (MTEP) and of the spin-Seebeck coefficient in MgO-based tunnel junctions with Fe and Co leads. In addition, the normal thermopower is calculated and gives, for pure Fe and Co, quantitative agreement with experiments. Consequently, the calculated values in tunnel junctions are a good estimation of upper limits. In particular, spin-Seebeck coefficients of more than 100 \ensuremathμV/K are possible. The MTEP ratio exceed several 1000% and depends strongly on temperature. In the case of Fe leads the MTEP ratio diverges even to infinity at certain temperatures. The spin-Seebeck coefficient as a function of temperature shows a nontrivial dependence. For Fe/MgO/Fe even the sign of the coefficient changes with temperature.