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

Authors
Jeon, JeehoonCho, Seong WonLee, OukJaeHong, JinkiKwak, Joon YoungHan, SeungwuJung, SoonhoKim, YunseokKo, Hye-WonLee, SuyounLee, Kyung-JinKoo, Hyun Cheol
Issue Date
11월-2021
Publisher
NATURE PORTFOLIO
Citation
NPG ASIA MATERIALS, v.13, no.1
Indexed
SCIE
SCOPUS
Journal Title
NPG ASIA MATERIALS
Volume
13
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135627
DOI
10.1038/s41427-021-00344-6
ISSN
1884-4049
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/(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.
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Hong, Jin Ki
과학기술대학 (디스플레이·반도체물리학부 반도체물리전공)
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