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Soucaille, R.; Belmeguenai, M.; Torrejon, J.; Kim, J.-V.; Devolder, T.; Roussigné, Y.; Chérif, S.-M.; Stashkevich, A. A.; Hayashi, M.; Adam, J.-P.
Physical review. B, 09/2016, Volume: 94, Issue: 10Journal Article
We have characterized the strength of the interfacial Dyzaloshinskii-Moriya interaction (DMI) in ultrathin perpendicularly magnetized CoFeB/MgO films, grown on different underlayers of W, TaN, and Hf, using two experimental methods. First, we determined the effective DMI field from measurements of field-driven domain wall motion in the creep regime, where applied in-plane magnetic fields induce an anisotropy in the wall propagation that is correlated with the DMI strength. Second, Brillouin light spectroscopy was employed to quantify the frequency nonreciprocity of spin waves in the CoFeB layers, which yielded an independent measurement of the DMI. By combining these results, we show that DMI estimates from the different techniques yield only qualitative agreement, which suggests that open questions remain about the underlying models used to interpret these results.
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