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https://hdl.handle.net/10356/85743
Title: | Enhanced spin-orbit torques in rare-earth Pt/[Co/Ni]2/Co/Tb systems | Authors: | Lew, Wen Siang Wong, Qi Ying Murapaka, Chandrasekhar Law, Wai Cheung Gan, Wei Liang Lim, Gerard Joseph |
Keywords: | Magnetism Materials Science DRNTU::Science::Physics |
Issue Date: | 2019 | Source: | Wong, Q. Y., Murapaka, C., Law, W. C., Gan, W. L., Lim, G. J., & Lew, W. S. (2019). Enhanced spin-orbit torques in rare-earth Pt/[Co/Ni]2/Co/Tb systems. Physical Review Applied, 11(2), 024057-. doi:10.1103/PhysRevApplied.11.024057 | Series/Report no.: | Physical Review Applied | Abstract: | We report the enhanced spin-orbit torque (SOT) effect due to the rare-earth metal Tb in a Pt/[Co/Ni]2/Co/Tb multilayer with perpendicular magnetic anisotropy (PMA). Due to the large spin-orbit coupling in Tb, the effective dampinglike efficiency, ξeffDL, is determined to be 0.55 for 9-nm Tb as compared to ξeffDL=0.18 for the reference Pt/[Co/Ni]2/Co/Ta stack. A relatively large effective spin Hall efficiency of Tb, θeffSH,Tb, is determined to be −0.480 for Tbwith a 9-nm thickness through a Hz-biased harmonic measurement. Enhanced magnetization switching efficiency is observed with increasing Tb thickness, affirming the sizable antidamping torque responsible for deterministic switching. Furthermore, due to a more substantial interfacial coupling in Co/Tb interface than in Co/Ta interface, strong angular dependence of the dampinglike and fieldlike terms is, but diminishes with increasing Tb thickness. These results affirm that Tb plays a significant role in tuning the SOT efficiency in these structures as the increased Tb concentration leads to an enhancement of the effective spin Hall angle and switching efficiency. | URI: | https://hdl.handle.net/10356/85743 http://hdl.handle.net/10220/48233 |
DOI: | 10.1103/PhysRevApplied.11.024057 | Schools: | School of Physical and Mathematical Sciences | Rights: | © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | SPMS Journal Articles |
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File | Description | Size | Format | |
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Enhanced spin-orbit torques in rare-earth Pt [CoNi] 2CoTb systems.pdf | 2.64 MB | Adobe PDF | View/Open |
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