  General phenomenological theory of magnetic spin waves in ferromagnetic media
is originally reformulated and applied to analysis of magnetostatic waves in
films and plates with arbitrary nisotropy under arbitrary external field. Exact
expressions are derived for propagator of linear waves between antennae
(inductors) and mutual impedances of antennae, and exact unified dispersion
equation is obtained which describes all types of magnetostatic wave
eigen-modes. Characteristic frequencies (spectra) and some other important
properties of main modes are analytically considered and graphically
illustrated. Besides, several aspects of non-linear excitations and
magnetic-wave chaos are discussed, including two-dimensional "non-linear
Schrodinger equations" for magnetostatic wave packets and envelope solitons.
