• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.81-84
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• 2005

We suggest flux quantum-based mechanism for force realization in the sub-pico-Newton range. By controlling the number of flux quantum in a superconducting ring, a force can be created as an integer multiple of a constant force step. For a 50 nm-thick Nb ring with the inner and outer radii of $5{\mu}m\;and\;10{\mu}m$, respectively, the force step is estimated to be 165 fN, assuming the magnetic field gradient of 10 T/m. We also estimated a maximum force limit to be $1\sim2$ pN.

• Proceedings of the KIEE Conference
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• 1996.07a
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• pp.178-180
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• 1996

An Inductive high-Tc superconducting fault current limiter using YBCO superconducting ring in the secondary part has many advantages in power networks. It is based on the appearance of resistivity in the superconductors and this paper is studied on the relation between the resistivity and the temperature of superconductors. In many other devices using superconductors, it is important to prohibit the superconductors from quenching for the protection of the whole system, or at least the superconductors.ᢁ