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Nonlinear Inductance of High Tc Superconducting Magnetic Core and Its Application to Quick Response Magnetic Sensors

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4 Author(s)
T. Uchiyama ; Nagoya University. ; K. Mohri ; A. Ozeki ; T. Shibata

Sensitive and quick-response nonlinear inductance characteristics were obtained for high-Tc superconducting (YBa2Cu3O7-x) bulk cores at 77K, for which soft magnetic B-H hysteresis loops were observed. Nonlinear initial magnetization curves were analyzed using a flux penetration model, taking the demagnetizing coefficient into consideration. New quick-response magnetic devices such as magnetic modulators, magnetic switches, magnetic field sensors and current sensors were constructed using the high-Tc superconducting cores of disk or toroidal shapes wound with polyester-coated copper wire coils. A sensor cutoff frequency of 700 kHz was obtained at a magnetizing frequency of 10 MHz.

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IEEE Translation Journal on Magnetics in Japan  (Volume:6 ,  Issue: 7 )