Magnetic damping anisotropy in the two-dimensional van der Waals material Fe\(_3\)GeTe\(_2\) from first principles

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-d...

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Bibliographic Details
Published inarXiv.org
Main Authors Yang, Pengtao, Ruixi Liu Zhe Yuan, Liu, Yi
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 16.10.2022
Subjects
Anisotropy
Curie temperature
Ferromagnetic materials
First principles
Low temperature
Magnetic damping
Mathematical analysis
Scattering
Spintronics
Temperature dependence
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Summary: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\(_2\).
ISSN:2331-8422
DOI:10.48550/arxiv.2210.08429