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We present results of the analysis of Brillouin Light Scattering (BLS)measurements of spin waves performed on ultrathin single and multirepeat CoFeBlayers with adjacent heavy metal layers. From a detailed study of the spin-wavedispersion relation, we independently extract the Heisenberg exchangeinteraction (also referred to as symmetric exchange interaction), theDzyaloshinskii-Moriya interaction (DMI, also referred to as antisymmetricexchange interaction), and the anisotropy field. We find a large DMI in CoFeBthin films adjacent to a Pt layer and nearly vanishing DMI for CoFeB filmsadjacent to a W layer. Furthermore, the residual influence of the dipolarinteraction on the dispersion relation and on the evaluation of the Heisenbergexchange parameter is demonstrated. In addition, an experimental analysis ofthe DMI on the spin-wave lifetime is presented. All these parameters play acrucial role in designing skyrmionic or spin-orbitronic devices.

Heisenberg Exchange and Dzyaloshinskii-Moriya Interaction in Ultrathin CoFeB Single and Multilayers