Based on a simple mechanical pendulum design, we developed a sensor for measurement of the horizontal force on a permanent magnet placed at any distance above a high-Tc superconductor. In this fully computerized system, which employs closed-loop feedback control, the lateral interaction with its restoring and hysteretic nature can be studied under conditions of constant vertical separation. Results are presented for the case of a small Nd-Fe-B magnet at a distance of 1 mm above a large planar disk of a YBa2Cu3Ox superconductor.
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Johansen et al. (1990) studied this question.
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