Amplification of magnetostatic surface waves in a layered structure consisting of metals, dielectrics, a semiconductor, and YIG

Abstract

The amplifying characteristics of magnetostatic surface waves (MSSW) propagating in a layered structure consisting of metal plates, dielectrics, a semiconductor, and a YIG slab are given. The dispersion relation of the system is derived under the condition of magnetostatic approximation. From the results of computer solution for the dispersion equation, we conclude that a growing MSSW occurs only when the carrier drift velocity is greater than phase velocity of the MSSW. The effect of YIG loss on the wave instability is considered. Also, the influence of a gap between the semiconductor and the YIG slab on the amplifier is discussed.