Hrabec, A orcid.org/0000-0002-2895-1962, Shahbazi, K orcid.org/0000-0002-1082-4535, Moore, TA orcid.org/0000-0001-6443-2556 et al. (2 more authors) (2019) Tuning spin–orbit torques at magnetic domain walls in epitaxial Pt/Co/Pt1−x Au x trilayers. Nanotechnology, 30 (23). 234003. ISSN 0957-4484
Abstract
Magnetic domain walls (DWs) in perpendicularly magnetised thin films are attractive for racetrack memories, but technological progress still requires further reduction of the operationing currents. To efficiently drive these objects by the means of electric current, one has to optimize the damping-like torque which is caused by the spin Hall effect (SHE). This not only requires a high net spin Hall angle but also the presence of a Dzyaloshinskii–Moriya interaction (DMI) to produce magnetic textures sensitive to this type of the torque. In this work, we explore the coexistence and importance of these two phenomena in epitaxial Pt/Co/Pt1−xAux films in which we control the degree of inversion symmetry-breaking between the two interfaces by varying x. Gold is used as a material with negligible induced magnetic moment and SHE and the interface between Co/Au as a source of a small DMI. We find no current-induced DW motion in the symmetric Pt/Co/Pt (x = 0) trilayer. By fitting a one-dimensional model to the DW velocity as a function of drive current density and in-plane applied field in samples with non-zero values of x, we find that both net DMI strength and spin Hall angle rise monotonically as Au is introduced. They reach values of 0.75 ± 0.05 mJ m−2 and 0.10 ± 0.01, respectively, for Pt/Co/Au (x = 1).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 IOP Publishing Ltd. This is an author produced version of a paper published in Nanotechnology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | magnetic multilayer, chiral domain wall, spin–orbit torque, spin Hall effect, Dzyaloshinskii–Moriya interaction |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Mar 2019 11:06 |
Last Modified: | 17 Dec 2024 12:39 |
Status: | Published |
Publisher: | IOP Publishing |
Identification Number: | 10.1088/1361-6528/ab087b |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:143440 |