Ab initio studies of the tunneling magneto-Seebeck effect: influence of magnetic material

Abstract

We found a strong influence of the composition of the magnetic material on the temperature dependence of the tunneling magneto-Seebeck effect in $MgO$ based tunnel junctions. We use \textit{ab initio} alloy theory to consider different $F{e}_{x}C{o}_{1-x}$ alloys for the ferromagnetic layer. Even a small change of the composition leads to strong changes in the magnitude or even in the sign of the tunneling magneto-Seebeck effect. This can explain differences between recent experimental results. In addition, changing the barrier thickness from six to ten monolayers of $MgO$ leads also to a non-trivial change of the temperature dependence. Our results emphasize that the tunneling magneto-Seebeck effect depends very crucially and is very sensitive to material parameters and show that further experimental and theoretical investigations are necessary.

References in corpus (4)

• Theory of magnon-driven spin Seebeck effect
• Thermoelectric Effects in Magnetic Nanostructures
• Spin caloritronics in magnetic tunnel junctions: Ab initio studies
• Implementation of a non-equilibrium Green's function method to calculate spin transfer torque

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