Field-like spin-orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers
- Field-like spin-orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers
- 구현철; 이수연; 이억재; 곽준영; 전지훈; 조성원; 홍진기; 한승우; 정순호; 김윤석; 고혜원; 이경진
- spin-orbit torque; bulk Rashba; GeTe
- Issue Date
- NPG Asia Materials
- VOL 13-76-9
- Most studies of the Rashba effect have focused on interfacial Rashba spin？orbit coupling. Recently, bulk Rashba
materials have attracted considerable interest owing to their potential to enhance the Rashba spin？orbit torque. By
employing a bulk Rashba material, GeTe, as a spin？orbit channel in GeTe/NiFe bilayers, a large field-like spin？orbit
torque up to 15.8 mT/(107 A cm？2) is measured. This value is one of the largest reported field-like torques and is
attributed to the interfacial spin？orbit coupling being enhanced by the bulk Rashba effect in the GeTe channel.
Furthermore, the large field-like torque is maintained even for a 20-nm-thick NiFe layer. This unconventional
dependence on the thickness of both the GeTe and NiFe layers cannot be described by conventional theory, but it is
believed to stem from the additional bulk Rashba effect-induced term. The large field-like torque over a wide range of
ferromagnet thicknesses results in scalable in-plane spin？orbit torque devices. This result calls for a further theoretical
study on spin transport in heterostructures, including bulk Rashba materials.
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