Field-like spin-orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers

Title
Field-like spin-orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers
Authors
구현철이수연이억재곽준영전지훈조성원홍진기한승우정순호김윤석고혜원이경진
Keywords
spin-orbit torque; bulk Rashba; GeTe
Issue Date
2021-11
Publisher
NPG Asia Materials
Citation
VOL 13-76-9
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/74281
ISSN
1884-4049
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KIST Publication > Article
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