Thermoelectric effects of resonant magnetic tunnel junctions

Thermoelectric effects of CoFeB/MgO/InP/MgO/CoFeB double-barrier magnetic tunnel junctions (DBMTJs) are presented in the linear response regime. The nonequilibrium Green's function (NEGF) formalism is used within the effective mass approximation. There are descriptions of temperature and angular dependence for thermoelectric properties. The results show an enhancement in the DBMTJs thermoelectric compared to single-barrier MTJs due to the resonant tunneling effect through the DBMTJs. It is also found that the Seebeck coefficients may be increase in asymmetric DBMTJs. Effects of the temperature and magnetization alignments on the spin-dependent Seebeck coefficients are also described. Finally, the Seebeck coefficients are investigated considering the Rashba spin-orbit coupling at the insulator/semiconductor interfaces.