Abstract
We assume a two-dimensional array of ferromagnetic particles on the surface of a thin type-II superconductor in a transverse magnetic field. With a particle at the center of each fluxoid, the pinning forceP and critical current increase ΔJ c due to the particles are calculated. General expressions without arbitrary parameters are given forP and ΔJ c as functions of magnetic field strength and the characteristics of the superconductor and the particles. For broad ranges of conditions values ofP and ΔJ c greater than 10−7 dyn and 105 A/cm2 result and for certain physically realistic sets of conditions,P>10−6 dyn and ΔJ c>106 A/cm2 are predicted. The above effects should be readily observable. An experiment for setting up the assumed conditions is proposed and discussed in some detail.
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