Searching for Magnetostatic Modes in Spin-Polarized Atomic Hydrogen

TL;DR

This study investigates the potential of magnetostatic spin waves in atomic hydrogen to explain ESR spectral features, but finds they are unlikely to be the cause based on theoretical modeling and comparison with experimental data.

Contribution

The paper applies the Walker equation to model magnetostatic modes in atomic hydrogen cylinders, providing insights into their role in ESR spectra.

Findings

Magnetostatic modes do not match observed ESR modulations.

Theoretical models show limited influence of magnetostatic modes on spectra.

Comparison suggests other mechanisms are responsible for ESR features.

Abstract

We consider a possibility of the magnetostatic type spin waves driven by a long-range magnetic dipole interactions, to account for the peaks in the ESR spectra observed in our previous work. The Walker equation for magnetostatic modes is solved for a cylinder of atomic hydrogen, first in a uniform magnetic field and second in a linearly decreasing magnetic field. The frequency behavior of the solved modes with length of the cylinder and density of the gas is compared to experimental data. We conclude that magnetostatic modes are unlikely to account for the observed modulations of ESR spectra.