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We present a comparison of the tunnel magneto-Seebeck effect for laserinduced and intrinsic heating. Therefore,Co$_{40}$Fe$_{40}$B$_{20}$/MgAl$_2$O$_4$ and Co$_{25}$Fe$_{55}$B$_{20}$/MgOmagnetic tunnel junctions have been prepared. The TMS ratio of 3\,\% in case ofthe MAO MTJ agrees well with ratios found for other barrier materials, whilethe TMS ratio of 23\,\% of the MgO MTJ emphasizes the influence of the CoFecomposition. We find results using the intrinsic method that differ in sign andmagnitude in comparison to the results of the laser heating. The intrinsiccontributions can alternatively be explained by the Brinkman model and thegiven junction properties. Especially, we are able to demonstrate that thesymmetric contribution is solely influenced by the barrier asymmetry. Thus, weconclude that the symmetry analysis used for the intrinsic method is notsuitable to unambiguously identify an intrinsic tunnel magneto-Seebeck effect.

Comparison of laser induced and intrinsic tunnel magneto-Seebeck effect in CoFeB/MgAl$_2$O$_4$ and CoFeB/MgO magnetic tunnel junctions