Magnetic polaritons in Fibonacci quasicrystals

A macroscopic theory is employed to investigate the magnetic polariton spec tra in pure and generalized Fibonacci magnetic quasicrystals. The polariton spectra are evaluated in the geometry where the wave vector and the applie d field are in the same plane (Voigt geometry). They are calculated for bot h ferromagnetic and antiferromagnetic orders by using a transfer-matrix app roach. Numerical results for the ferromagnets EuS and for the antiferromagn et MnF2 are presented to discuss the fractal aspect of the spectra, includi ng the localization of the modes as well as their scaling properties. (C) 2 000 Elsevier Science B.V. All rights reserved.