期刊
ACS APPLIED MATERIALS & INTERFACES
卷 15, 期 42, 页码 49538-49544出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c11578
关键词
thermal conductivity; van der Waals; 2D materials; ferromagnetism; thermoreflectance
The thermal conductivity of a van der Waals two-dimensional ferromagnet Fe3GeTe2 was studied, revealing diffusion transport and changes in thermal conductivity associated with thickness and magnetic phase transition. These findings demonstrate the potential of van der Waals ferromagnets in thermal transport engineering.
The emergence of symmetry-breaking orders such as ferromagnetism and the weak interlayer bonding in van der Waals materials offers a unique platform to engineer novel heterostructures and tune transport properties like thermal conductivity. Here, we report the experimental and theoretical study of the cross-plane thermal conductivity, kappa(perpendicular to), of the van der Waals two-dimensional (2D) ferromagnet Fe3GeTe2. We observe an increase in kappa(perpendicular to) with thickness, indicating a diffusive transport regime with ballistic contributions. These results are supported by the theoretical analyses of the accumulated thermal conductivity, which show an important contribution of phonons with mean free paths between 10 and 200 nm. Moreover, our experiments show a reduction of kappa(perpendicular to) in the low-temperature ferromagnetic phase occurring at the magnetic transition. The calculations show that this reduction in kappa(perpendicular to) is associated with a decrease in the group velocities of the acoustic phonons and an increase in the phonon-phonon scattering of the Raman modes that couple to the magnetic phase. These results demonstrate the potential of van der Waals ferromagnets for thermal transport engineering.
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