Complete identification of spin-wave eigenmodes excited by parametric pumping in YIG microdisks

TL;DR

This study demonstrates the complete identification and excitation of spin-wave eigenmodes in YIG micro-disks using parametric pumping, magnetic resonance force microscopy, and Brillouin light scattering, advancing spin-wave control for computation.

Contribution

It provides the first comprehensive spectroscopic labeling of over 40 spin-wave modes excited by parallel pumping in YIG micro-disks, combining experimental and simulation methods.

Findings

Almost all fundamental eigenmodes can be excited by parallel pumping.

Complete spectroscopic labeling of over 40 modes achieved.

Experimental results align with micromagnetic simulations.

Abstract

We present the parametric excitation of spin-wave modes in YIG micro-disks via parallel pumping. Their spectroscopy is performed using magnetic resonance force microscopy (MRFM), while their spatial profiles are determined by micro-focus Brillouin light scattering (BLS). We observe that almost all the fundamental eigenmodes of an in-plane magnetized YIG micro-disk, calculated using a micromagnetic eigenmode solver, can be excited using the parallel pumping scheme, as opposed to the transverse one. The comparison between the MRFM and BLS data on one side, and the simulations on the other side, provides the complete spectroscopic labeling of over 40 parametrically excited modes. Our findings could be promising for spin-wave-based computation schemes, in which the amplitudes of a large number of spin-wave modes have to be controlled.