Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.62: Poster

Friday, March 30, 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.