With cerium rare earth iron garnet crystal and its production manner and magnetic field sensor

摘要

PROBLEM TO BE SOLVED: To improve the detection sensibility of a sensor by eliminating Cotton-Mouton effect caused by a vertical magnetic field Hb while maintaining a state that the direction of spin of photon is aligned by applying the vertical magnetic field Hb.;SOLUTION: The compositional ratio of a cerium rare earth iron garnet crystal being a magneto-optical element for a magnetic field sensor is set to be Ce3-xDyxFe5O12, provided 0x3. Further, in the magnetic field sensor which is provided with a polarizer P, the magneto-optical element 1, an analyzer A and a detector D, and in which a magnetic field Ha in the propagation direction of light is applied to the magneto- optical element 1 and the quantity of light is detected by the Faraday effect, a magnetic field Hb is previously applied in the direction perpendicular to the propagation direction of light so as to make the direction of magnetization 2 constant, and the difference between double refraction indices of the propagation direction and the perpendicular direction, which is formed by applying the magnetic field Hb in the perpendicular direction, is compensated by the magneto-optical element 1 formed from the cerium rare earth iron garnet crystal having the compositional ratio of Ce3-xDyxFe5O12, provided 0x3.;COPYRIGHT: (C)2002,JPO