Asymmetric spin-wave dispersion due to Dzyaloshinskii-Moriya interaction in an ultrathin Pt/CoFeB film
Kai Di, Vanessa Li Zhang, Hock Siah Lim, Ser Choon Ng, Meng Hau Kuok,, Xuepeng Qiu, and Hyunsoo Yang
TL;DR
This study uses Brillouin spectroscopy to demonstrate that strong interfacial Dzyaloshinskii-Moriya interactions cause asymmetric spin-wave dispersion in ultrathin Pt/CoFeB films, highlighting CoFeB's potential in spintronic applications.
Contribution
The paper provides experimental evidence of Dzyaloshinskii-Moriya interactions causing asymmetric spin-wave dispersion in ultrathin Pt/CoFeB films, supported by micromagnetic simulations.
Findings
Strong interfacial Dzyaloshinskii-Moriya interactions observed
Spin-wave nonreciprocity attributed to Dzyaloshinskii-Moriya interactions
Implications for magnonic and spintronic applications
Abstract
Employing Brillouin spectroscopy, strong interfacial Dzyaloshinskii-Moriya interactions have been observed in an ultrathin Pt/CoFeB film. Our micromagnetic simulations show that spin-wave nonreciprocity due to asymmetric surface pinning is insignificant for the 0.8nmthick CoFeB film studied. The observed high asymmetry of the monotonic spin wave dispersion relation is thus ascribed to strong Dzyaloshinskii-Moriya interactions present at the Pt/CoFeB interface. Our findings should further enhance the significance of CoFeB as an important material for magnonic, spintronic and skyrmionic applications.
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