An equivalent circuit scheme with lumped parameters for a magnetic junction formed in an array of two-layer nanowires is considered. In this scheme, the flow of electrons with relaxing spins is represented by a relaxation current flowing through an imaginary resistance. The possibility of a spin impedance arising at the interface between the layers, due to the inertia of the spin relaxation process, is shown in terms of the equivalent circuit. The non-thermal nature of the radiation observed during spin injection by current and the possible manifestation of spin impedance, when the radiation power increases with decreasing current, have been experimentally shown.
Zagorskiy et al. (2025) studied this question.