Magnetic excitations in (SiO2)Co nano-composite films: Brillouin light scattering study

Abstract: Behaviour of magnetic excitations in the Damon–Eshbach (DE) and backward volume (BV) geometries in nano-composite (SiO2)100− x Co x (50%at<x<80%at) films has been studied by Brillouin light scattering (BLS). It has been shown that it is the structure of Stokes/anti-Stokes BLS lines in the DE geometry that allows reliable identification of dipole-exchange spin waves (SW) and numerical estimation of the value of the effective exchange constant Aeff of a super-ferromagnetic nano-granular sample (x=80%at). [Copyright &y& Elsevier]