We investigate the spin Hall effect (SHE) in a van der Waals (vdW) ferromagnet Fe5GeTe2 (FGT) with a Curie temperature TC of 310 K utilizing the spin-torque ferromagnetic resonance method. In synchronization with the emergence of the ferromagnetic phase resulting in the anomalous Hall effect (AHE), a noticeable enhancement in the SHE was observed below TC. On the other hand, the SHE shows a different temperature dependence from the AHE: the effective spin Hall conductivity is clearly enhanced with decreasing temperature unlike the anomalous Hall conductivity, reflecting the variation of band-structure accompanied by the complicated magnetic ordering of the FGT. The results provide a deep understanding of the SHE in magnetic materials to open a new route for novel functionalities in vdW materials-based spintronic devices.
@article{arxiv.2601.06274,
title = {Spin Hall effect in van der Waals ferromagnet Fe$_{5}$GeTe$_{2}$},
author = {Tomoharu Ohta and Yuto Samukawa and Nan Jiang and Yasuhiro Niimi and Kohei Yamagami and Yoshinori Okada and Yoshichika Otani and Kouta Kondou},
journal= {arXiv preprint arXiv:2601.06274},
year = {2026}
}