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Collective spin waves in RKKY interlayer-coupled Ni80Fe20/Ru/Ni80Fe20nanowire arrays
Adekunle O Adeyeye1,2, Bushra Hussain3, Michael G Cottam4
1Department of Physics, Durham University, South Rd, DH1 3LE Durham, United Kingdom.
Abstract:
We report on a comprehensive investigation of collective spin waves in Ruderman-Kittel-Kasuya-Yosida (RKKY) interlayer-coupled Ni80Fe20(10 nm)/Ru(1.0 nm)/ Ni80Fe20(10 nm) nanowire (NW) arrays. We employed Brillouin light scattering to probe the field- and wavevector-dependences of the spin-wave frequency spectra. The acquired data were subsequently analyzed and interpreted within the framework of a microscopic Hamiltonian-based method, enabling a detailed understanding of the observed spin-wave behavior. 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-NW dynamical dipolar interactions.
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