Experimental study of spin-wave dispersion in Py/Pt film structures in the presence of an interface Dzyaloshinskii-Moriya interaction

A.A. Stashkevich, M. Belmeguenai, Y. Roussigné, S.M. Cherif, Mikhail Kostylev, M. Gabor, D. Lacour, C. Tiusan, M. Hehn

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    Abstract

    © 2015 American Physical Society. Brillouin light scattering (BLS), complemented by ferromagnetic resonance (FMR) characterization, has been used for studying spin-wave (SW) propagation in Py(L)/Pt(6-nm) bilayers of various Py thicknesses (4nm≤L≤10nm). The FMR measurements allowed determination of the pertinent magnetic parameters and revealed the existence of a normal surface anisotropy. A pronounced asymmetry of Damon-Eshbach (DE) wave frequencies has been evidenced by BLS. Therefore, the difference between Stokes and anti-Stokes DE frequencies has been measured versus SW wave number for all the samples. A detailed discussion about the origin of this frequency difference is reported, which concludes that this is due to interface Dzyaloshinskii-Moriya interaction (IDMI).
    Original languageEnglish
    Pages (from-to)214409-1 - 214409-9
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume91
    Issue number21
    DOIs
    Publication statusPublished - 8 Jun 2015

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