Spin caloritronics in magnetic tunnel junctions: Ab initio studies

Abstract

This Letter presents ab initio calculations of the magneto-thermoelectric power (MTEP) and of the spin-Seebeck coefficient in MgO based tunnel junctions with Fe and Co leads. In addition, the normal thermopower is calculated and gives for pure Fe and Co an quantitative agreement with experiments. Consequently, the calculated values in tunnel junctions are a good estimation of upper limits. In particular, spin-Seebeck coefficients of more than 100 μV/K are possible. The MTEP ratio exceed several 1000% and depends strongly on temperature. In the case of Fe leads the MTEP ratio diverges even to infinity at certain temperatures. The spin-Seebeck coefficient as a function of temperature shows a non-trivial dependence. For Fe/MgO/Fe even the sign of the coefficient changes with temperature.

6 pages, 5 figures

References in corpus (5)

• Theory of magnon-driven spin Seebeck effect
• Thermal Spin-Transfer Torques in Magnetoelectronic Devices
• Thermoelectric Effects in Magnetic Nanostructures
• Thermally excited spin-current in metals with embedded ferromagnetic nanoclusters
• Implementation of a non-equilibrium Green's function method to calculate spin transfer torque

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• Time-resolved measurement of the tunnel magneto-Seebeck effect in a single magnetic tunnel junction
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• Determination of spin-dependent Seebeck coefficients of CoFeB/MgO/CoFeB magnetic tunnel junction nanopillars
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• Systematic Investigation of Anisotropic Magneto-Peltier Effect and Anomalous Ettingshausen Effect in Ni Thin Films
• Parameter space for thermal spin-transfer torque
• Comparison of laser induced and intrinsic tunnel magneto-Seebeck effect in CoFeB/MgAl${}_2$O${}_4$ and CoFeB/MgO magnetic tunnel junctions
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• Tunneling magneto thermocurrent in CoFeB/MgO/CoFeB based magnetic tunnel junctions
• 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
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• Giant magnetothermopower in charge ordered Nd0.75Na0.25MnO3
• Tunneling Magneto-Thermopower in Magnetic Tunnel Junctions
• Thermal conductivity of thin insulating films determined by tunnel magneto-Seebeck effect measurements and finite-element modeling
• Tunneling Anisotropic Thermopower and Seebeck Effects in Magnetic Tunnel Junctions
• Pumping laser excited spins through MgO barriers
• Theory of magnon-mediated tunnel magneto-Seebeck effect
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• Strain-induced enhancement of the Seebeck effect in magnetic tunneling junctions via interface resonant tunneling: Ab-initio study