High-fidelity magnonic gates for surface spin waves

TL;DR

This paper demonstrates a nanoscale magnonic gate that uses electric fields to control surface spin wave propagation in coupled waveguides, enabling high-fidelity signal modulation for magnonic devices.

Contribution

It introduces a novel electric-field-controlled surface spin wave magnonic gate leveraging magneto-electric coupling for precise wave propagation control.

Findings

Electric field can modulate magnonic band gaps.

Switching electric fields enables on/off control of spin wave propagation.

Proposed device is feasible at the nanoscale.

Abstract

We study the propagation of surface spin waves in two wave guides coupled through the dipole-dipole interaction. Essential for the observations made here is the magneto-electric coupling between the spin waves and the effective ferroelectric polarization. This allows an external electric field to act on spin waves and to modify the band gaps of magnonic excitations in individual layers. By an on/off switching of the electric field and/or varying its strength or direction with respect to the equilibrium magnetization, it is possible to permit or ban the propagation of the spin waves in selected waveguide. We propose experimentally feasible nanoscale device operating as a high fidelity surface wave magnonic gate.