Amplification of surface magnetic waves in transversely magnetized ferrite slabs

摘要

The problem of the amplification of surface magnetic waves in transversely magnetized ferrite slabs has been solved in a general planar layered structure. It is found that the amplification indeed exists, but it is confined to a definite (very narrow) frequency range, which depends essentially on the drift velocity of the interacting charge carriers. The amplification depends in a fundamental way on semiconductor conductivity, and also on the magnetic losses of the ferrite. The above results are deemed to constitute all the essential characteristics of the amplification phenomenon. Complex‐wave‐number magnetostatic (ms) modes in the transversely magnetized slab are also found that complete the already‐known real‐wave‐number ms surface wave. Consideration of these modes is required when performing the exact analysis of the amplification process by numerical computation.