Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spincaloric Transport
MA 5.1: Vortrag
Montag, 14. März 2011, 11:00–11:15, HSZ 04
Magneto Seebeck effect in Co-Fe-B/MgO/Co-Fe-B tunnel junctions — •Marvin Walter1, Jakob Walowski1, Vladyslav Zbarsky1, Markus Münzenberg1, Volker Drewello2, Daniel Ebke2, Günter Reiss2, Andy Thomas2, Patrick Peretzki3, Michael Seibt3, Michael Czerner4, Michael Bachmann4, and Christian Heiliger4 — 1I. Physikalisches Institut, Universität Göttingen — 2Department of Physics, Bielefeld University — 3IV. Physikalisches Institut, Universität Göttingen — 4I. Physikalisches Institut, Universität Giessen
Co-Fe-B/MgO/Co-Fe-B devices showing a giant TMR effect are possible candidates for the generation of spin-currents by thermal heating. We present the observation of a magneto Seebeck effect in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions (MTJs). The effects could be used for thermal spin-injection and thermally driven spin-transfer torque.
The samples presented in this work consist of a minimal pseudo-spin-valve stack with sputtered Ta and Co-Fe-B layers and an e-beam evaporated MgO barrier. The MTJs are heated by a diode laser which achieves powers of up to 100 mW and is focused onto the sample in a standard confocal microscope setup. The heating is simulated by finite element methods and the experimental results are compared with ab initio calculations of the magneto-thermoelectric power and of the spin-Seebeck coefficient.