Controllable Spin Current in van der Waals Ferromagnet Fe3GeTe2

Abstract

The control of spin current is pivotal for spintronic applications, especially for spin-orbit torque devices. Spin Hall effect (SHE) is a prevalent method to generate spin current. However, it is difficult to manipulate its spin polarization in nonmagnet. Recently, the discovery of spin current in ferromagnet offers opportunity to realize the manipulation. In the present work, the spin current in van der Waals ferromagnet Fe3GeTe2 (FGT) with varying magnetization is theoretically investigated. It has been observed that the spin current in FGT presents the nonlinear behavior with respect to magnetization. The in-plane and out-of-plane spin polarization emerges simultaneously, and the bilayer FGT can even exhibit arbitrary spin polarization thanks to the reduced symmetry. More intriguingly, the correlation between anomalous Hall effect (AHE) and spin anomalous Hall effect (SAHE) has been interpreted from the aspect of Berry curvature. This work illustrates that the interplay of symmetry and magnetism can effectively control the magnitude and spin polarization of the spin current, providing a practical method to realize exotic spin-orbit torques.

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Cited by in corpus (4)

• Hidden interplay of current-induced spin and orbital torques in bulk Fe${}_3$GeTe${}_2$
• High-throughput calculations of spin Hall conductivity in non-magnetic 2D materials
• Edge non-collinear magnetism in nanoribbons of Fe3GeTe2 and Fe3GaTe2
• Spin scattering and Hall effects in monolayer Fe3GeTe2