  A lattice of particles with dipolar magnetic moments is considered under the
presence of quadratic Zeeman effect. Two types of this effect are taken into
account, the effect due to an external nonresonant magnetic field and the
effect caused by an alternating quasiresonance electromagnetic field. The
presence of the alternating-field quadratic Zeeman effect makes it possible to
efficiently vary the sample characteristics. The main attention is payed to the
study of spin waves whose properties depend on the quadratic Zeeman effect. By
varying the quadratic Zeeman-effect parameter it is possible to either suppress
or stabilize spin waves.
