Magnetization relaxation in the two-dimensional itinerant ferromagnetic van der Waals material Fe3GeTe2, below the Curie temperature, is fundamentally important for applications to low-dimensional spintronics devices. We use first-principles scattering theory to calculate the temperature-dependent Gilbert damping for bulk and single-layer Fe3GeTe2. The calculated damping frequency of bulk Fe3GeTe2 increases monotonically with temperature because of the dominance of resistivitylike behavior. By contrast, a very weak temperature dependence is found for the damping frequency of a single layer, which is attributed to strong surface scattering in this highly confined geometry. A systematic study of the damping anisotropy reveals that orientational anisotropy is present in both bulk and single-layer Fe3GeTe2. Rotational anisotropy is significant at low temperatures for both the bulk and a single layer and is gradually diminished by temperature-induced disorder. The rotational anisotropy can be significantly enhanced by up to 430% in gated single-layer Fe3GeTe2.
@article{arxiv.2210.08429,
title = {Magnetic damping anisotropy in the two-dimensional van der Waals material Fe$_3$GeTe$_2$ from first principles},
author = {Pengtao Yang and Ruixi Liu Zhe Yuan and Yi Liu},
journal= {arXiv preprint arXiv:2210.08429},
year = {2022}
}