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Chapters 1 to 3 present the basic concepts of electromagnetic and magnetoelastic wave propagation in biased ferrif!Iagnetics. The response of a ferrimagnetic to external electromagnetic and elastic fields is discussed in Chapter 1. The permeability tensor has been obtained for magnetically saturated ferrimagnetic, considering the various interactions present in a real ferrimagnetic. The coupled magnetoelastic equations have also been developed. Chapter 2 discusses electromagnetic and magnetoelastic plane wave propagation in ferrimagnetics. Chapter 3 presents an analysis of electromagnetic and magnetoelastic wave propagation across plane interfaces; these studies provide a physical insight into the relevant phenomena and serve as a background for the appreciation of more complex wave propagation phenomena in ferrimagnetics (which is of practical importance). In Chapter 4 we discuss the propagation oi magnetostatic waves in layered planar structures; the analysis and experimental results pertaining to a number of practical configurations are presented. The applications to delay lines, filters, convolvers, and magnetostatic wave amplifiers are also discussed. Chapter 5 considers magnetoelastic guided wave propagation in layered planar structures and its applications. Gaussian units have been used throughout the book.We wish to thank our colleague Prof. A.K. Ghatak for providing the inspiration to write this book. We are also grateful to Dr. I. Rattan for a critical review of the manuscript, to Mr. S. S. Gupta and Mr. S. N. Bajpai for helpful discussions, and to Mr. T. N. Gupta for his kind and ungrudging assistance in the preparation of the manuscript. The financial support of NSF (USA) for the original work reported in this book is gratefully acknowledged.

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