Abstract
The influence of the mixed state of type II superconductor on magnetostatic wave (MSW) dispersion and absorption is theoretically investigated. The MSW characteristics are shown to depend on the relationship between the MSW a.c. field penetration depth into superconductor 1, wavelength λ and superconductor thickness b. The former is expressed in terms of an effective conductivity, which is strongly dependent on the d.c. vortex velocity vo due to a d.c. current. If vo exceeds the MSW phase velocity, instead of absorption of the wave, we have its amplification. The effect of d.c. voltage generation owing to the dragging of vortices by MSW is also studied.
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