Second-harmonic signature of chiral spin structures in W/Pt/Co heterostructures with tunable magnetic anisotropy
Date
2023-03-28
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Physics D: Applied Physics
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.
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.
Keywords
second-harmonic Hall voltage measurement, chiral domain walls, Dzyaloshinskii-Moriya interaction, magnetic anisotropy
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.