Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
Steven S.-L. Zhang, Shufeng Zhang
TL;DR
This paper investigates how a nonequilibrium magnon current in a ferromagnetic insulator can mediate electric current drag between two metallic layers separated by the insulator, using a semiclassical Boltzmann approach.
Contribution
It introduces a new mechanism for electric current drag mediated by magnons in a metal-FI-metal structure, extending understanding beyond Coulomb interactions.
Findings
Magnon currents can effectively mediate electric current drag.
The semiclassical Boltzmann approach accurately models the interface boundary conditions.
The study provides quantitative predictions for drag current magnitude.
Abstract
In a semiconductor hererostructure, the Coulomb interaction is responsible for the electric current drag between two 2D 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. We determine the drag current by using the semiclassical Boltzmann approach with proper boundary conditions of electrons and magnons at the metal-FI interface.
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