Second-harmonic signature of chiral spin structures in W/Pt/Co heterostructures with tunable magnetic anisotropy
| Author(s) | Wang, Yang | |
| Author(s) | Chan, Ying-Ting | |
| Author(s) | Wang, Xiao | |
| Author(s) | Wang, Tao | |
| Author(s) | Cheng, Xuemei M. | |
| Author(s) | Wu, Weida | |
| Author(s) | Xiao, John Q. | |
| Date Accessioned | 2023-04-21T17:51:03Z | |
| Date Available | 2023-04-21T17:51:03Z | |
| Publication Date | 2023-03-28 | |
| Description | This is the Accepted Manuscript 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 Version of Record is available online at https://doi.org/10.1088/1361-6463/acc40f. This article will be embargoed until March 28, 2024. | |
| Abstract | Second-harmonic Hall voltage (SHV) measurement method has been widely used to characterize the strengths of spin–orbit torques (SOTs) in heavy metal/ferromagnet thin films saturated in the single-domain regime. Here, we show that the magnetic anisotropy of a W/Pt/Co trilayer can be robustly tuned from in-plane to out-of-plane by varying W, Pt, or Co thicknesses. Moreover, in samples with easy-cone anisotropy, SHV measurements exhibit anomalous 'humps' in the multidomain regime accessed by applying a nearly out-of-plane external magnetic field. These hump features can only be explained as a result of the formation of Néel-type domain walls, efficiently driven by nevertheless small SOTs in this double heavy metal heterostructure with canceling spin Hall angles. | |
| Sponsor | We thank Y. Ji for use of the cryogenic transport measurement system, and X. Chen and A. Soumyanarayanan for helpful discussions. The work at Delaware was supported by NSF under grant number NSF DMR 1904076. The MFM measurements at Rutgers were supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, U.S. Department of Energy under award No. DE-SC0018153. The work at Bryn Mawr College was supported by NSF under grant number NSF DMR 1708790. | |
| Citation | Yang Wang et al., “Second-Harmonic Signature of Chiral Spin Structures in W/Pt/Co Heterostructures with Tunable Magnetic Anisotropy,” Journal of Physics D: Applied Physics 56, no. 20 (March 28, 2023): 205002, https://doi.org/10.1088/1361-6463/acc40f. | |
| ISSN | 1361-6463 | |
| URL | https://udspace.udel.edu/handle/19716/32663 | |
| Language | en_US | |
| Publisher | Journal of Physics D: Applied Physics | |
| Keywords | second-harmonic Hall voltage measurement | |
| Keywords | chiral domain walls | |
| Keywords | Dzyaloshinskii-Moriya interaction | |
| Keywords | magnetic anisotropy | |
| Title | Second-harmonic signature of chiral spin structures in W/Pt/Co heterostructures with tunable magnetic anisotropy | |
| Type | Article |
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