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

Abstract

We present a comparison of the tunnel magneto-Seebeck effect for laser induced and intrinsic heating. Therefore, Co${}_{40}$Fe${}_{40}$B${}_{20}$/MgAl${}_2$O${}_4$ and Co${}_{25}$Fe${}_{55}$B${}_{20}$/MgO magnetic tunnel junctions have been prepared. The TMS ratio of 3\,\% in case of the MAO MTJ agrees well with ratios found for other barrier materials, while the TMS ratio of 23\,\% of the MgO MTJ emphasizes the influence of the CoFe composition. We find results using the intrinsic method that differ in sign and magnitude in comparison to the results of the laser heating. The intrinsic contributions can alternatively be explained by the Brinkman model and the given junction properties. Especially, we are able to demonstrate that the symmetric contribution is solely influenced by the barrier asymmetry. Thus, we conclude that the symmetry analysis used for the intrinsic method is not suitable to unambiguously identify an intrinsic tunnel magneto-Seebeck effect.

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• Enhancement of thermovoltage and tunnel magneto-Seebeck effect in CoFeB based magnetic tunnel junctions by variation of the MgAl${}_2$O${}_4$ and MgO barrier thickness
• Anomalous Nernst effect on the nanometer scale: Exploring three-dimensional temperature gradients in magnetic tunnel junctions
• Thermal conductivity of thin insulating films determined by tunnel magneto-Seebeck effect measurements and finite-element modeling
• Pumping laser excited spins through MgO barriers
• Strain-induced enhancement of the Seebeck effect in magnetic tunneling junctions via interface resonant tunneling: Ab-initio study