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유권상(K. S. Ryu),박진습(J. S. Park) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.6
Coercivity is defined as the magnetic field strength required to reduce the magnetic polarization to zero of magnetic specimen which has been previously magnetized to saturation. This quantity is a reference for classifying soft and hard magnetic materials. We have constructed the measuring system for measurement of coercivity of ferromagnetic materials in open magnetic circuit. The measurement range of the constructed system is from tens A/m to tens ㎄/m, the combined uncertainty is ±0.22 ㎄/m as coercivity is 14.63 ㎄/m.