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We investigate the spin-dependent Seebeck coefficient and the tunnelingmagneto thermopower of CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJ) in thepresence of thermal gradients across the MTJ. Thermal gradients are generatedby an electric heater on top of the nanopillars. The thermo power voltageacross the MTJ is found to scale linearly with the heating power and revealssimilar field dependence as the tunnel magnetoresistance. The amplitude of thethermal gradient is derived from calibration measurements in combination withfinite element simulations of the heat flux. Based on this, largespin-dependent Seebeck coefficients of the order of (240 \pm 110) \muV/K arederived. From additional measurements on MTJs after dielectric breakdown, atunneling magneto thermopower up to 90% can be derived for 1.5 nm MgO based MTJnanopillars.

Determination of spin-dependent Seebeck coefficients of CoFeB/MgO/CoFeB magnetic tunnel junction nanopillars