Magnetic damping anisotropy in the two-dimensional van der Waals material Fe${}_3$GeTe${}_2$ from first principles

Abstract

Magnetization relaxation in the two-dimensional itinerant ferromagnetic van der Waals material Fe${}_3$GeTe${}_2$, 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 Fe${}_3$GeTe${}_2$. The calculated damping frequency of bulk Fe${}_3$GeTe${}_2$ 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 Fe${}_3$GeTe${}_2$.

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Cited by in corpus (4)

• Orbital-excitation-dominated magnetization dissipation and quantum oscillation of Gilbert damping in Fe films
• Angular dependence of spin-orbit torque in monolayer $F{e}_{3}GeT{e}_2$
• Highly tunable Gilbert damping in two-dimensional van der Waals ferromagnet Fe3GaTe2: From bilayer to the twisted bilayer
• Symmetry-forbidden intraband transitions leading to ultralow Gilbert damping in van der Waals ferromagnets