Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: [MA] Poster II
O 91.62: Poster
Freitag, 30. März 2012, 11:00–14:00, Poster A
Dependence of the magneto-Seebeck effect on the CoFe distribution in MgO tunnel junctions — •Jakob Walowski1, Marvin Walter1, Vladyslav Zbarsky1, Anissa Zeghuzi1, Christian Leutenantsmeyer1, Mirco Marahrens1, Markus Münzenberg1, Markus Schäfers2, Daniel Ebke2, Günter Reiss2, Andy Thomas2, Patrick Peretzki3, Michael Seibt3, Michael Czerner4, Michael Bachmann4, and Christian Heiliger4 — 1I. Phys. Inst., Universität Göttingen — 2Dept. of Physics, Bielefeld University — 3IV. Phys. Inst., Universität Göttingen — 4I. Phys. Inst., Universität Gießen
Thermally driven techniques gain more importance, as ever smaller element sizes in electronics reach exorbitantly high current densities, threatening with a breakdown of Moore’s Law. Currently magnetic tunnel junctions attract a lot of attention, because they are interesting from the spinelectronic and the spincaloritronic point of view. Spin-transfer torque magnetic RAM, as well as thermal-spin-transfer torque elements are in the current discussion as future technologies.
The magneto-thermal effects in CoFeB|MgO|CoFeB tunnel junctions strongly depend on the distribution of the Co and Fe atoms within layers at the interface to the MgO barrier. Supported by theoretical calculations using the energy dependent transmission function, we present the temperature dependent Seebeck coefficients in parallel and antiparallel magnetization alignment, and the magneto-Seebeck ratio for tunnel junctions with different Co and Fe distributions.
We acknowledge the funding by the DFG through the SFB 602.