Abstract:
In semiconductor heterostructure, the Coulomb interaction is responsible for the electric current drag between two 2-d electron gases across an electron impenetrable insulator. For two metallic layers separated by a ferromagnetic insulator (FI) layer, the electric current drag can be mediated by a nonequilibrium magnon current of the FI. In this talk, I describe how an electron spin current in metals converts into magnon currents in a FI layer. By Using the semiclassical Boltzmann approach with proper boundary conditions, we predict the electric drag current.