Reconfigurable Spin-Wave Coupler Based on Domain-Wall Channels

Abstract

In functional magnonic devices, spin-wave couplers serve a key role in controlling the spin-wave transmission across different magnonic units. Here we study a reconfigurable spin-wave coupler based on domain-wall channels. The design relies on the dipolar interaction between spin waves propagating in neighboring domain walls. The dipolar-coupled spin-wave modes and their propagation in domain walls are analyzed using micromagnetic simulations and analytical calculations. The distance between domain walls and thus the spin-wave coupling strength can be tuned dynamically. Such a feature results in a dynamically manipulatable spin-wave coupler that enables full control over the propagation properties of coupled spin waves. The spin-wave coupler based on domain-wall channels can be achieved in a single magnetic film, avoiding complex nanofabrication, and enabling possibilities in reconfigurable magnonic functional devices.