  We consider electron drag in a system of two ferromagnetic layers separated
by an insulating interface. The source of it is expected to be magnon-electron
interactions. Namely, we assume that the external voltage is applied to the
"active" layer stimulating electric current through this layer. In its turn,
the scattering of the current-carrying electrons by magnons leads to a magnon
drag current within this layer. The 3-magnons interactions between magnons in
the two layers (being of non-local nature) lead to magnon drag within the
"passive" layer which, correspondingly, produce electron drag current via
processes of magnon-electron scattering. We estimate the drag current and
compare it to the phonon-induced one.
