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We present a study of the tunnel magneto-Seebeck (TMS) effect in MgO basedmagnetic tunnel junctions (MTJs). The electrodes consist of CoFeB with in-planemagnetic anisotropy. The temperature gradients which generate a voltage acrossthe MTJs layer stack are created using laser heating. Using this method, thetemperature can be controlled on the micrometer length scale: here, weinvestigate, how both, the TMS voltage and the TMS effect, depend on the size,position and intensity of the applied laser spot. For this study, a largevariety of different temperature distributions was created across the junction.We recorded two-dimensional maps of voltages generated by heating in dependenceof the laser spot position and the corresponding calculated TMS values. Thevoltages change in value and sign, from large positive values when heating theMTJ directly in the centre to small values when heating the junction on theedges and even small negative values when heating the sample away from thejunction. Those zero crossings lead to very high calculated TMS ratios. Oursystematic analysis shows, that the distribution of the temperature gradient isessential, to achieve high voltage signals and reasonable resulting TMS ratios.Furthermore, artefacts on the edges produce misleading results, but also openup further possibilities of more complex heating scenarios forspincaloritronics in spintronic devices.

Pumping laser excited spins through MgO barriers