The magnetic excitations in ferromagnetic SrRuO3 were studied by inelastic neutron scattering combining experiments on triple-axis and time-of-flight spectrometers with and without polarization analysis. A quadratic spin-wave dispersion with an anisotropy gap describes the low-energy low-temperature response. The magnon dispersion extends to at least 35 meV and there is no direct evidence for a continuum of Stoner excitations below this energy. However, the magnon response is weakened at higher energy. In addition to the anomalous softening of the spin-wave stiffness and of the gap, which is induced by the topology of the Bloch states, the magnon excitations are broadened in energy and this effect increases upon heating.
@article{arxiv.2305.05497,
title = {Magnon dispersion in ferromagnetic SrRuO$_3$},
author = {K. Jenni and S. Kunkemöller and A. Tewari and R. A. Ewings and Y. Sidis and A. Schneidewind and P. Steffens and A. A. Nugroho and M. Braden},
journal= {arXiv preprint arXiv:2305.05497},
year = {2023}
}