ABSTRACT
This chapter considers surface magnetostatic modes in ferromagnets, first for films including the semi-infinite limit and then for double-layer systems. It discusses the more complex problem of surface modes in the dipole-exchange region for ferromagnets and antiferromagnets, using both the macroscopic and microscopic methods. The chapter describes the experimental results for magnetostatic modes and dipole-exchange modes in various surface geometries. A theory of the long-wavelength surface magnetostatic modes in semi-infinite antiferromagnets was first given by V. V. Tarasenko and V. D. Kharitonov and extended by R. E. Camley. In the magnetostatic region the wavelength of any excitation is very large compared with the lattice spacing, and so a continuum approximation for the ferromagnet should be valid. Surface magnetostatic modes in ferromagnets typically have frequencies that correspond to the microwave region, and there are applications for signal processing. The frequencies are also very suitable for experimental studies by Brillouin scattering.
