Starting with a brief review of developments in the magnon concept, and including original experimental results, the author presents methods of magnon excitation, and several basic models to describe magnon gas. He includes experiments on Bose-Einstein condensation of quasi-equilibrium magnons, as well as various applications of a magnon approach.

This book is written for the readers who have an interest in magnetic dynamics problems both for fundamental and applied research, and for the development of magnetic devices. It is also written in more or less academic style, and therefore can be used by graduate students and professors of technical universities. They can find here topics that may serve as the basis of future doctoral dissertations. For those who do not work directly with the magnetic systems, this book can give a bunch of ideas and analogies that can be useful in their research.