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Symmetry Control of Unconventional Spin–Orbit Torques in IrO2

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Title
Symmetry Control of Unconventional Spin–Orbit Torques in IrO2
Author(s)
Patton, Michael; Gurung, Gautam; Shao, Ding-Fu; Noh, Gahee; Mittelstaedt, Joseph A.; Mazur, Marcel; Kim, Jong-Woo; Ryan, Philip J.; Tsymbal, Evgeny Y.; Si-Young Choi; Ralph, Daniel C.; Rzchowski, Mark S.; Nan, Tianxiang; Eom, Chang-Beom
Publication Date
2023-07
Journal
Advanced Materials, v.35, no.39
Publisher
John Wiley and Sons Inc
Abstract
Spin–orbit torques generated by a spin current are key to magnetic switching in spintronic applications. The polarization of the spin current dictates the direction of switching required for energy-efficient devices. Conventionally, the polarizations of these spin currents are restricted to be along a certain direction due to the symmetry of the material allowing only for efficient in-plane magnetic switching. Unconventional spin–orbit torques arising from novel spin current polarizations, however, have the potential to switch other magnetization orientations such as perpendicular magnetic anisotropy, which is desired for higher density spintronic-based memory devices. Here, it is demonstrated that low crystalline symmetry is not required for unconventional spin–orbit torques and can be generated in a nonmagnetic high symmetry material, iridium dioxide (IrO2), using epitaxial design. It is shown that by reducing the relative crystalline symmetry with respect to the growth direction large unconventional spin currents can be generated and hence spin–orbit torques. Furthermore, the spin polarizations detected in (001), (110), and (111) oriented IrO2 thin films are compared to show which crystal symmetries restrict unconventional spin transport. Understanding and tuning unconventional spin transport generation in high symmetry materials can provide a new route towards energy-efficient magnetic switching in spintronic devices. © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.
URI
https://pr.ibs.re.kr/handle/8788114/14314
DOI
10.1002/adma.202301608
ISSN
0935-9648
Appears in Collections:
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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