Study of spin control on half metallic ferromagnetism and thermoelectric properties of MgEu2(S/Se)4 for spintronic and energy harvesting devices

Abstract

Spintronic is the emerging technology for next generation electronic devices that can improve memory and computing capability by use of electrons spin degree of freedom. The electronic, magnetic, and transport properties of MgEu2(S/Se)4 spinels are explored systematically. These spinels are stable in ferromagnetic state (FM) confirmed by energy release in optimization, phonons band structures, and enthalpy of formation (ΔHf). The Curie temperature and spin polarization signify spin polarization at high temperature. The hybridization of p-S/Se and f-Eu states have been discussed from Band structure, and density of states which explain the nature of ferromagnetism. The crystal field and exchange energies are also reported for the verification of control of electrons spin. Furthermore, the exchange constants, and double exchange mechanism also premeditated. The double exchange model is satisfied by the negative Δx (pf) and constant Noβ. Moreover, the Seebeck coefficient, conductivities, and power factor (PF) for spin (↑) and spin (↓) are investigated separately and collectively by BoltzTraP code. The high values of PF and ultralow values of thermal conductivity make the potential materials for thermoelectric generators.