We discuss spin-wave transport in anisotropic ferromagnets with an emphasis on the zeroes of the band edges as a function of a magnetic field. An associated divergence of the magnon spin should be observable by enhanced magnon conductivities in non-local experiments, especially in two-dimensional ferromagnets.
@article{arxiv.2304.10709,
title = {Soft Magnons in Anisotropic Ferromagnets},
author = {G. E. W. Bauer and P. Tang and M. Elyasi and Y. M. Blanter and B. J. van Wees},
journal= {arXiv preprint arXiv:2304.10709},
year = {2023}
}