The magnetic excitations of the skyrmion lattice in MnSi comprise a multitude of individual modes, which are non-reciprocal and thereby propagate unidirectionally. We report inelastic neutron scattering experiments for temperatures near and above the skyrmion-paramagnetic phase transition in the chiral magnet MnSi tracking the evolution from the skyrmion lattice towards the high-temperature paramagnetic state. Within the resolution of the triple-axis measurements the excitations vary smoothly across the skyrmion-paramagnetic boundary, and, the quasi-elastic paramagnetic signal under applied field retains the non-reciprocal character seen in the skyrmion phase even far above the critical temperature. Using a resolution-convolution our results are consistent with linear spin-wave theory.
@article{arxiv.2602.07121,
title = {Non-reciprocal spin excitations across the skyrmion-paramagnetic phase transition in MnSi},
author = {Tobias Weber and Karin Schmalzl and Johannes Waizner and Andreas Bauer and Markus Garst and Christian Pfleiderer},
journal= {arXiv preprint arXiv:2602.07121},
year = {2026}
}