Charge-spin conversion signal in WTe2 van der Waals hybrid devices with a geometrical design

TL;DR

This study demonstrates charge-spin conversion signals in WTe2-based hybrid devices, showing how geometry influences the signals and confirming their robustness at room temperature for potential spintronic applications.

Contribution

It reports the first observation of charge-spin conversion signals in WTe2 hybrid devices with a specific geometrical design, highlighting the role of device geometry and gate voltage.

Findings

Charge-spin conversion signals are observed in WTe2 hybrid devices.

The geometrical angle affects symmetric and anti-symmetric CSC components.

CSC signals remain robust at room temperature.

Abstract

The efficient generation and control of spin polarization via charge-spin conversion in topological semimetals are desirable for future spintronic and quantum technologies. Here, we report the charge-spin conversion (CSC) signals measured in a Weyl semimetal candidate WTe2 based hybrid graphene device with a geometrical design. Notably, the geometrical angle of WTe2 on the graphene spin-valve channel yields contributions to symmetric and anti-symmetric CSC signal components. The spin precession measurements of CSC signal at different gate voltages and ferromagnet magnetization shows the robustness of the CSC in WTe2 at room temperature. These results can be useful for the design of heterostructure devices and in the architectures of two-dimensional spintronic circuits.