Stochastic properties and Brillouin light scattering response of thermally driven collective magnonic modes on the arrays of dipole coupled nanostripes

In the present paper, the problem of thermal excitation of collective (magnonic) Bloch magnetostatic modes on a one-dimensional array of magnetic stripes has been addressed. It has been shown that partially phase-correlated oscillations localized on individual stripes can be regarded as an ensemble of individual harmonic oscillators interpretable in terms of independent degrees of freedom of the magnetic system subject to the low-energy Rayleigh-Jeans statistics. Numerical simulations of the Brillouin light scattering spectra, based on this approach, have shown that the nth Bloch mode in strongly coupled stripes contributes mainly to the scattering in the nth Brillouin zone. Our calculations have also confirmed numerically the noncoherent wide-angle character of the BLS, demonstrated experimentally earlier.