Excitation of propagating spin waves in ferromagnetic films

The linear excitation of spin waves by an inhomogeneous microwave magnetic field (the field of a microwave antenna) is investigated. The investigation is based on the spin-wave normal-mode theory which takes into account the specific features of spin waves (dipole and exchange interactions and surface-spin-pinning conditions) travelling in perpendicularly and in tangentially magnetised thin ferromagnetic films. Explicit dispersion equations and expressions for the spin-wave magnetisation generated are derived. These expressions enable one to calculate the characteristics of spin waves excited by the microwave field of an antenna.