Collective spin waves in RKKY interlayer-coupled Ni80Fe20/Ru/ Ni80Fe20nanowire arrays.

We report on a comprehensive investigation of collective spin waves in RKKY interlayer-coupled Ni80Fe20 (10nm)/Ru(1.0 nm)/ Ni80Fe20 (10nm) nanowire arrays. We employed Brillouin light scattering to probe the field- and wavevector-dependences of the spin-wave frequency spectra. The acquired data was subsequently analyzed and interpreted within the framework of a microscopic Hamiltonian-based method, enabling a detailed understanding of the observed spin-wave behaviour. We observed the propagation of Bloch-type collective spin waves within the arrays, characterized by distinct magnonic bandwidths that stem from the combined influence of RKKY interlayer and inter-nanowire dynamical dipolar interactions.&#xD.