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MA: Fachverband Magnetismus

MA 5: Spincaloric Transport

MA 5.1: Talk

Monday, March 14, 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.