Thermally induced spin torque and domain-wall motion in superconductor/antiferromagnetic-insulator bilayers

We theoretically investigate domain-wall motion in an antiferromagnetic-insulator layer caused by thermally generated spin currents in an adjacent spin-split superconductor layer. An uncompensated antiferromagnet interface enables the two crucial ingredients underlying the mechanism---spin splitting in the superconductor and absorption of spin currents by the antiferromagnet. Treating the superconductor using the quasiclassical theory and the antiferromagnet via Landau-Lifshitz-Gilbert description, we find domain-wall propagation along the thermal gradient with relatively large velocities $\ensuremath{\sim}100$ m/s. Our proposal exploits the giant thermal response of spin-split superconductors in achieving large spin torques towards driving domain wall and other spin textures in antiferromagnets.