Flux-Line Pinning in a Superconducting Vibrating Reed

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Abstract
A thin ribbon of a superconducting material clamped at one end and excited to flexural vibrations may be used to study flux pinning. The resonance frequency, strongly enhanced in a longitudinal magnetic field, slightly decreases and the damping drastically increases when the flux lines are allowed to move relative to the pins. The reed may be further used as a sensitive magnetometer and to measure Bc1 (≦7mT) of ceramic high-Tc superconductors from which we made reeds.

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