Longitudinal critical current in a ferrite-type-II superconductor structure |
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Authors: | Yu I Bespyatykh V D Kharitonov W Wasylewskii |
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Institution: | (1) Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 141120 Fryazino, Moscow Region, Russia;(2) Wyższa Szkoła Techniczna, Radom, Poland |
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Abstract: | The effect of the interaction of Abrikosov vortices with the magnetization on the longitudinal vortical instability in a layered
ferromagnet-type-II superconductor structure is analyzed. It is shown that in the vicinity of the orientational phase transition
in the magnet, where the transverse magnetic susceptibility is large, the magnitude of the longitudinal critical current in
the structure can be almost 1.5 times smaller than in the isolated superconductor. The reason for this is compensation of
stray field sources outside the superconductor by “magnetic charges” arising from a jump in the transverse magnetization on
the surface of the magnet. A structure is considered in which the thickness of the superconductor significantly exceeds the
London penetration depth of the magnetic field and the wavelength of the critical mode. For this reason (in light of the absence
of high-quality bulk high-temperature superconductors), to experimentally study the described phenomenon it is necessary to
use conventional low-temperature superconductors.
Fiz. Tverd. Tela (St. Petersburg) 39, 231–235 (February 1997) |
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Keywords: | |
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