INSTABILITY OF ABRIKOSOV VORTICES IN A TYPE-II SUPERCONDUCTOR-FERRITESTRUCTURE WITH A LONGITUDINAL ELECTRIC-FIELD

The influence of the interaction of the Abrikosov vortices with the ma gnetization on the longitudinal vortex instability in a layered type-I I superconductor-ferrite structure is analyzed. It is shown that in th e vicinity of the orientational phase transition in the magnet, where the transverse susceptibility of the magnet is high, the longitudinal critical current in the structure can be almost 1.5 times smaller than the corresponding value in the isolated superconductor. Because of th e influence of the nonlocality of the interaction between the vortices , such an effect can be observed only in structures with superconducto rs that have weak or moderate pinning. A structure is considered in wh ich the thickness of the superconductor is significantly greater than the London magnetic-held penetration depth and the wavelength of the c ritical mode. (C) 1997 American Institute of Physics. [S 1063-7842-(97 )00607-7].