High T/sub c/ superconducting nonlinear inductance and quick response magnetic sensor devices

A flux penetration model that takes into account the demagnetizing effect is presented in order to analyze the nonlinear inductance characteristics for high-temperature superconductors. Various quick-response magnetic devices such as modulators, magnetic switches, and magnetic sensors were constructed. It is shown that the magnetizing frequency can be set at more than 10 MHz, which is difficult to achieve with the conventional ferromagnetic bulk cores. A cutoff frequency of 1.6 MHz was obtained for the sensors using the high-temperature superconducting cores at a magnetizing frequency of 11.5 MHz.<
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