Magnetoresistance effect of heat generation in a single-molecular spin-valve

•Spin-valve effect of heat generation happens when Coulomb repulsion in quantum dot is less than phonon frequency.•When Coulomb repulsion is larger than phonon frequency, inverse spin-valve effect appears and is enlarged with bias increasing.•The variation of spin polarization degree can change heat generation effectively.•The heat magnetoresistance can be modulated from heat-resistance to heat-gain by gate voltage easily.

Based on non-equilibrium Green's functions' theory and small polaron transformation's technology, we study the heat generation by current through a single-molecular spin-valve. Numerical results indicate that the variation of spin polarization degree can change heat generation effectively, the spin-valve effect happens not only in electrical current but also in heat generation when Coulomb repulsion in quantum dot is smaller than phonon frequency and interestingly, when Coulomb repulsion is larger than phonon frequency, the inverse spin-valve effect appears by sweeping gate voltage and is enlarged with bias increasing. The inverse spin-valve effect will induce the unique heat magnetoresistance effect, which can be modulated from heat-resistance to heat-gain by gate voltage easily.