Spin Seebeck effect in the 2D ferromagnetic CrPbTe3.

Spin Seebeck effect has been mostly explored in bulk magnetic materials, but the efficiency is not large enough for device application. Recently, we have found that the 2D ferromagnetic CrPbTe3 layer has rather a high Curie temperature of 110 K. Thus, we have investigated the spin dependent Seebeck effect using the Boltzmann transport approach. We have found the largest carrier mobility and relaxation time in the minority spin electron carrier system due to the spin dependent effective mass and deformation potential constant. The onset energy of the electrical conductivity shows spin and carrier type dependency. Thus, both effective spin and effective charge Seebeck coefficients are originated from the majority spin carrier in the hole doped system whereas the minority spin carrier controls the effective spin and effective charge Seebeck coefficient in the electron doped system. We have obtained the maximum spin Seebeck coefficient of 1320 μV/K at 50 K. This value is suppressed at 100 K, but we still find a large spin Seebeck coefficient of 715 μV/K. • We investigated the spin dependent thermoelectric properties of the 2D CrPbTe3 monolayer system. • We obtained a large spin Seebeck effect of 1320 μV/K at 50 K. • The spin Seebeck effect has a magnitude of 715 μV/K at 100 K. • The spin and charge Seebeck effect exhibited similar behavior. • This find may lead to various spin dependent thermoelectric applications. [ABSTRACT FROM AUTHOR]