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We studied the spin-to-charge and charge-to-spin conversion at roomtemperature in sputtered WTe2-x (x=0.8)(t)/Co20Fe60B20(6 nm) heterostructures.Spin pumping measurements were used to characterize the spin-to-chargeefficiency and the spin efficiency was calculated to be larger than ~0.035.Second harmonic Hall measurements were carried out to estimate thecharge-to-spin conversion ratio. We found that the system exhibits a largefield-like-torque (spin torque efficiency ~ 0.1) and small damping-like-torque(spin torque efficiency ~0.001) compared to that reported for heavy metals.High-resolution transmission electron microscopy images show that the WTe2-xlayer is amorphous, which may enhance the spin swapping effect by inducinglarge interfacial spin orbit scattering, thus contributing to a large fieldlike torque.

Spin pumping and large field-like torque at room temperature in sputtered amorphous WTe$_{2-x}$ films