Collective dynamics in chains of rectangular dots -- Presentazione poster by R. Zivieri - Conferenza internazionale

We present a combined experimental and micromagnetic study of spin excitations in chains of dense magnetic dots. The samples consist of long chains of rectangular dots with rounded corners having lateral dimensions of 715 x 450 nm2 and 1025 x 450 nm2, respectively with edge-to-edge separation below 100 nm. The frequency dispersion of the spin wave excitations was measured by Brillouin Light Scattering (BLS) technique for a given applied in-plane magnetic field H and as a function of q (Bloch wave vector) directed along the chains of dots. Micromagnetic calculations, performed by using the dynamical matrix method enabled us to interpret the frequency dispersion of collective spin modes. Calculated dispersions were compared with BLS ones in the Voigt geometry (q perpendicular to H). -- Presentazione poster by R. Zivieri - Conferenza internazional