Higgs and Goldstone spin-wave modes in striped magnetic texture
Abstract
Spontaneous symmetry breaking is ubiquitous in physics. Its spectroscopic signature consists in the softening of a specific mode upon approaching the transition from the high symmetry side and its subsequent splitting into a zero-frequency "Goldstone" mode and a non-zero-frequency "Higgs" mode. Although they determine the whole system dynamics, these features are difficult to address in practice because of their vanishing coupling to most experimental probes and/or their strong interaction with other fluctuations. In this work, we consider a periodic magnetic modulation occurring in a ferromagnetic film with perpendicular-to-plane magnetic anisotropy and directly observe its Goldstone and Higgs spin-wave modes at room temperature using microwave and optical techniques. This simple system constitutes a particularly convenient platform for further exploring the dynamics of symmetry breaking.
Keywords
Cite
@article{arxiv.2110.00882,
title = {Higgs and Goldstone spin-wave modes in striped magnetic texture},
author = {Matías Grassi and Moritz Geilen and Kosseila Ait Oukaci and Yves Henry and Daniel Lacour and Daniel Stoeffer and Michel Hehn and Philipp Pirro and Matthieu Bailleul},
journal= {arXiv preprint arXiv:2110.00882},
year = {2022}
}
Comments
7 pages, 3 figures, it includes Supplementary information