Abstract
On the basis of the Meissner effect and the London theory of superconductivity, we theoretically studied the interaction between a magnetic point dipole and a superconducting sphere. Furthermore, the force acting on the tip of a magnetic force microscope from a superconducting sphere was derived on the basis of the London theory of superconductivity. For a micro-system, we derived an analytical expression of the repelling forces as a function of the London penetration depth λ(T) and suggest an experimental method to measure λ(T) as a function of temperature T. From the model study, we show the invalidity of the frequency used image method for some superconductor-magnet systems.
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