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Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet

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Abstract

The creep of a magnetic flux trapped in a bulk high-temperature superconductor has been studied. It has been found that the magnetic relaxation is retarded when the superconductor is placed near a ferromagnet. The value of the retardation effect depends on the sequence of magnetization and the approach of the superconductor to a ferromagnet. The magnetic relaxation is fully suppressed when a superconducting sample first is magnetized and then is brought close to a ferromagnet. An interpretation of this effect has been discussed. Being magnetized, a ferromagnet produces its own magnetic field. While penetrating into a disk sample through its planes, the ferromagnet field induces screening currents, which circulate oppositely to the current that arises upon trapping of the magnetic flux. As a result, the stability of the magnetic structure is sharply improved since opposite driving forces can act on different sections of the vortices.

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Authors and Affiliations

  1. Institute of Thermal Physics, Ural Division RAS, 106 Amundsen St., 620016, Ekaterinburg, Russia

    B. M. Smolyak, G. V. Ermakov & M. S. Zakharov

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  1. B. M. Smolyak
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  2. G. V. Ermakov
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  3. M. S. Zakharov
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Correspondence to B. M. Smolyak.

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Smolyak, B.M., Ermakov, G.V. & Zakharov, M.S. Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet. J Supercond Nov Magn 24, 325–329 (2011). https://doi.org/10.1007/s10948-010-1039-7

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  • DOI: https://doi.org/10.1007/s10948-010-1039-7

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