Resonant magnetic induction tomography of a magnetized sphere

TL;DR

This paper introduces a novel resonant magnetic induction tomography technique to image and identify spin-wave modes in a bulk ferromagnetic sphere, enabling advanced magnonic research.

Contribution

It presents the first method to structurally image magnetostatic spin-wave modes in a bulk magnetized sphere using microwave resonant magnetic induction tomography.

Findings

Successfully imaged spin-wave modes in a ferromagnetic sphere.

Established azimuthal and polar dependence of modes.

Provides a new tool for magnonic fundamental studies.

Abstract

We demonstrate the structural imaging of magnetostatic spin-wave modes hosted in a millimeter-sized ferromagnetic sphere. Unlike for low-dimensional magnetic materials, there is no prior technique to image these modes in bulk magnetized solid of revolution. Based on resonant magnetic induction tomography in the microwave range, our approach ensures the robust identification of these non-trivial spin-wave modes by establishing their azimuthal and polar dependences, starting point of magnonic fundamental studies and hybrid systems with complex spin textures well beyond the uniform precession mode.