Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/153889
Title: Effect of seed and interlayer Pt thickness on spin-orbit torque efficiency in Co/Pt multilayer with perpendicular magnetic anisotropy
Authors: Lim, Gerard Joseph
Gan, Weiliang
Lew, Wen Siang
Keywords: Science::Chemistry
Science::Physics
Issue Date: 2020
Source: Lim, G. J., Gan, W. & Lew, W. S. (2020). Effect of seed and interlayer Pt thickness on spin-orbit torque efficiency in Co/Pt multilayer with perpendicular magnetic anisotropy. Journal of Physics D: Applied Physics, 53(50), 505002-. https://dx.doi.org/10.1088/1361-6463/abacef
Project: NRF-CRP9-2011-01
NRF2015-IIP001-001
I1801E0030
Journal: Journal of Physics D: Applied Physics
Abstract: As-deposited [Co/Pt] multilayers show strong perpendicular magnetic anisotropy (PMA) and spin-orbit torque (SOT). However, such structures require properly textured Pt (111) seed layers and optimized interlayer Pt thicknesses in order to maximise both PMA and SOT efficiency. In this work, the interplay of seed and interlayer Pt thickness on PMA and SOT efficiency in Ta/Pt/[Co/Pt]₃/Co/Ta multilayers was studied. Using the harmonic lock-in method, the SOT damping- and field-like efficiencies were determined, with corrections for current shunting as well as the planar Hall effect. Our measurements show that the corrected effective SOT efficiencies are at least twice as large as the uncorrected values, with damping-like efficiency of up to ∼22 Oe per 10¹⁰ A m⁻², which scales inversely with the Pt seed and interlayer thicknesses due to screening of the spin current originating from the high-resistivity bottom β-Ta layer. The choice of Pt seed and interlayer thicknesses is a compromise between PMA and SOT efficiency of the device.
URI: https://hdl.handle.net/10356/153889
ISSN: 0022-3727
DOI: 10.1088/1361-6463/abacef
Rights: © 2020 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.1088/1361-6463/abacef
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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