Optical excitation of multiple standing spin modes in 3D optomagnonic nanocavities

TL;DR

This paper demonstrates the first experimental observation of multiple standing spin modes in a 3D optomagnonic nanocavity, achieved through high optical confinement in a nanometer-sized iron-garnet structure, advancing 3D optomagnonics.

Contribution

It introduces the first experimental detection of multiple spin modes in 3D nanocavities, combining nanophotonics and magnonics for enhanced control of spin dynamics.

Findings

Observation of multiple standing spin modes in 3D nanocavities

High confinement of optically generated magnetic fields

Quantization and inhomogeneity of spin-wave modes

Abstract

We report the first experimental observation of multiple standing spin modes in 3D optomagnonic nanocavity formed by nanometer-sized iron-garnet nanocylinder. We show that launching of standing spin modes is achieved due to a high confinement of the optically generated effective magnetic field caused by the localized optical resonance. Quantization and spin-wave mode inhomogeneity is achieved in each of the three spatial dimensions. The presented approach opens new horizons of 3D optomagnonics by combining nanophotonic and magnonic functionalities within a single nanocavity.