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The sign of the interfacial Dzyaloshinskii-Moriya interaction in ultrathin amorphous and polycrystalline magnetic films

Title
The sign of the interfacial Dzyaloshinskii-Moriya interaction in ultrathin amorphous and polycrystalline magnetic films
Authors
Cho, JaehunKim, Nam-HuiKang, Seung KuHwang, Hee-KyeongJung, Jin-YoungSwagten, Henk J. M.Kim, June-SeoYou, Chun-Yeol
DGIST Authors
Kim, Nam-Hui; Hwang, Hee-Kyeong; Kim, June-Seo; You, Chun-Yeol
Issue Date
2017-10
Citation
Journal of Physics D-Applied Physics, 50(42)
Type
Article
Article Type
Article
Keywords
Brillouin Light ScatteringDependenceDomain-WallsDrivenDynamicsDzyaloshinskii-Moriya InteractionExchangeMagneticOrderPhysicsReal-Space ObservationSpin-Orbit CouplingThinfilm
ISSN
0022-3727
Abstract
We investigate the sign of the interfacial Dzyaloshinskii-Moriya interaction (iDMI) energy density in system with inversion symmetry breaking for amorphous and polycrystalline ferromagnetic layers (CoFeB, Co) sandwiched by two different or the same heavy metals (Pt, Ta). By employing Brillouin light scattering, we observe non-reciprocal spin-wave dispersions which is a fingerprint of iDMI in SiO2/(Pt, Ta)/(CoFeB, Co)/(Pt, Ta) systems. We carefully confirm that the signs of DMI of structurally inverted systems are changed accordingly. Negative iDMI for SiO2/Pt/(CoFeB, Co)/Ta and positive iDMI for SiO2/Ta/(CoFeB, Co)/Pt are observed, and iDMI of the symmetric structures (Pt/CoFeB/Pt and Ta/CoFeB/Ta) are not measureable with our Brillouin light scattering setup due to a negligible iDMI. For amorphous CoFeB, the magnitudes of iDMI are the same within the experimental error regardless the stacking order. For the textured Co, however, the magnitude of iDMI for Pt/Co/Ta is about 30 % larger than Ta/Co/Pt structure.
URI
http://hdl.handle.net/20.500.11750/4624
DOI
10.1088/1361-6463/aa89d4
Publisher
IOP PUBLISHING LTD
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles
DGIST-LBNL Research Center for Emerging Materials1. Journal Articles


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