Jeon, Jeehoon Cho, Seong Won Lee, OukJae Hong, Jinki Kwak, Joon Young Han, Seungwu Jung, Soonho Kim, Yunseok Ko, Hye-Won Lee, Suyoun Lee, Kyung-Jin Koo, Hyun Cheol 2024-01-19T13:30:23Z 2024-01-19T13:30:23Z 2022-01-10 2021-11-26 1884-4049 https://pubs.kist.re.kr/handle/201004/116112 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/(10(7) 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. English NATURE PORTFOLIO PRECESSION Field-like spin-orbit torque induced by bulk Rashba channels in GeTe/NiFe bilayers Article 10.1038/s41427-021-00344-6 1 NPG ASIA MATERIALS, v.13, no.1 NPG ASIA MATERIALS 13 1 scie scopus 000722605300003 2-s2.0-85119884409 Materials Science, Multidisciplinary Materials Science Article PRECESSION spin-orbit torque bulk Rashba GeTe