This review volume deals with recent advances in topics of importance to scientists and engineers involved in research and device development utilizing magnetic oxides and multilayers. The subject matter covered includes linear and nonlinear high frequency magnetic excitations and interaction between magnons and photons. In particular, this book contains detailed discussion on the detection of magnons by Brillouin light scattering and photothermal spectroscopy, interaction between spin waves and optical guided modes, microwave solitons, and spin wave instabilities. Recent advances in traditional characterization techniques such as ferromagnetic and antiferromagnetic resonance, and in studies on magnetic order in noncrystalline oxides are also presented.