Experimental determination and micromagnetic analysis of spin wave modes in cylindrical nanowires

TL;DR

This study experimentally investigates and analyzes the discrete spin wave modes in individual cylindrical nanowires using micro-Brillouin light scattering and micromagnetic simulations, revealing how mode frequencies depend on magnetic field.

Contribution

It provides the first detailed experimental and micromagnetic analysis of spin wave modes in cylindrical nanowires, linking observed frequencies to specific spatial modes.

Findings

Discrete spin wave modes observed in nanowires

Mode frequencies increase with magnetic field

Micromagnetic simulations successfully identify mode structures

Abstract

We report an experimental study of spin wave modes in individual cylindrical nanowires, a textbook situation of confined spin waves in 3D nanomagnetism. We observe discrete modes of thermal spin waves with micro-Brillouin light scattering, whose frequencies $f$ shift to higher values as the applied longitudinal induction magnetic field $B_z$ increases. Micromagnetic simulations allowed us to associate every $f(B_z)$ curve to a given spatial mode, labeled with radial and azimuthal indices $\ell$ and $m$.