The behaviour of magnonic gaps in 1D arrays of in-plane magnetized rectangular Permalloy dots with lateral dimensions 715 x 450 nm^2 and 1025 x 450 nm^2, respectively is investigated by means of micromagnetic simulations based on the dynamical matrix method [L. Giovannini et al., Phys. Rev. B, 75 (2007) 024416]. Band gaps of collective spin modes in the Voigt geometry (magnetic field parallel to the easy axis and in-plane wave vector parallel to the dot chains) are calculated and compared with those obtained by means of Brillouin Light Scattering technique. The narrowing of band gaps either in the centre or at the border of the first Brillouin zone for vanishing dot separation is discussed in terms of the collective nature of the corresponding spin modes. The calculation of the resonant mode frequency of the corresponding stripe obtained in the limit of zero separation is performed and compared with the one determined by using a simple analytical model based on the Green's function tensor. -- Presentazione orale by R. Zivieri - Conferenza internazionale
Band gaps in 1D "magnonic" crystals: a micromagnetic study -- Presentazione orale by R. Zivieri - Conferenza internazionale
ZIVIERI, Roberto;MONTONCELLO, Federico;GIOVANNINI, Loris;NIZZOLI, Fabrizio;
2010
Abstract
The behaviour of magnonic gaps in 1D arrays of in-plane magnetized rectangular Permalloy dots with lateral dimensions 715 x 450 nm^2 and 1025 x 450 nm^2, respectively is investigated by means of micromagnetic simulations based on the dynamical matrix method [L. Giovannini et al., Phys. Rev. B, 75 (2007) 024416]. Band gaps of collective spin modes in the Voigt geometry (magnetic field parallel to the easy axis and in-plane wave vector parallel to the dot chains) are calculated and compared with those obtained by means of Brillouin Light Scattering technique. The narrowing of band gaps either in the centre or at the border of the first Brillouin zone for vanishing dot separation is discussed in terms of the collective nature of the corresponding spin modes. The calculation of the resonant mode frequency of the corresponding stripe obtained in the limit of zero separation is performed and compared with the one determined by using a simple analytical model based on the Green's function tensor. -- Presentazione orale by R. Zivieri - Conferenza internazionaleI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
