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https://doi.org/10.1038/s41598-019-53783-1
Title: | In-situ study of oxygen exposure effect on spin-orbit torque in Pt/Co bilayers in ultrahigh vacuum | Authors: | Xie, H. Yuan, J. Luo, Z. Yang, Y. Wu, Y. |
Issue Date: | 2019 | Publisher: | Nature Research | Citation: | Xie, H., Yuan, J., Luo, Z., Yang, Y., Wu, Y. (2019). In-situ study of oxygen exposure effect on spin-orbit torque in Pt/Co bilayers in ultrahigh vacuum. Scientific Reports 9 (1) : 17254. ScholarBank@NUS Repository. https://doi.org/10.1038/s41598-019-53783-1 | Rights: | Attribution 4.0 International | Abstract: | Oxygen incorporation has been reported to increase the current-induced spin-orbit torque in ferromagnetic heterostructures, but the underlying mechanism is still under active debate. Here, we report on an in-situ study of the oxygen exposure effect on spin-orbit torque in Pt/Co bilayers via controlled oxygen exposure, Co and Mg deposition, and electrical measurements in ultrahigh vacuum. We show that the oxygen exposure on Pt/Co indeed leads to an increase of spin-orbit torque, but the enhancement is not as large as those reported previously. Similar enhancement of spin-orbit torque is also observed after the deposition of an MgO capping layer. The results of ab initio calculations on the Rashba splitting of Pt/Co and Pt/Co/O suggest that the enhancement is due to enhanced Rashba-Edelstein effect by surface-adsorbed oxygen. Our findings shed some light on the varying roles of oxygen in modifying the spin torque efficiency reported previously. © 2019, The Author(s). | Source Title: | Scientific Reports | URI: | https://scholarbank.nus.edu.sg/handle/10635/212223 | ISSN: | 20452322 | DOI: | 10.1038/s41598-019-53783-1 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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