Efficient Gating of Magnons by Proximity Superconductors

TL;DR

This paper demonstrates that superconducting strips can effectively gate and reflect magnons in magnetic films, enabling new functionalities in magnonic devices through controllable magnon confinement and reflection.

Contribution

It introduces a novel method of gating magnons using superconducting strips, which was not previously demonstrated, allowing for reprogrammable magnonic devices.

Findings

Superconducting strips reflect magnons via diamagnetic response.

Large frequency shifts unidirectionally block magnon propagation.

Parallel superconducting gates create a magnonic cavity.

Abstract

Electrostatic gating confines and controls the transport of electrons in integrated circuits. Magnons, the quanta of spin waves of the magnetic order, are promising alternative information carriers, but difficult to gate. Here we report that superconducting strips on top of thin magnetic films can totally reflect magnons by its diamagnetic response to the magnon stray fields. The induced large frequency shifts unidirectionally blocks the magnons propagating normal to the magnetization. Two superconducting gates parallel to the magnetization create a magnonic cavity. The option to gate coherent magnons adds functionalities to magnonic devices, such as reprogrammable logical devices and increased couplings to other degrees of freedom.