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Domain effects in faraday effect sensors based on iron garnets



M. N. Deeter


Domain effects in Faraday effect fiber-optic magnetic field sensors which employ thick films and bulk crystals of iron · garnets produce fundamentally different responses. Iron garnet films with uniaxial magnetic anisotropy exhibit domain-induced diffraction which produces a nonlinear signal even in films for which the net magnetization is exactly linear with the applied field. Fortunately, differential detection eliminates this nonlinearity. Moreover, differential detection applied to these films produces a signal which is linear regardless of the value of the saturation Faraday rotation. This behavior is quite unlike that of other Faraday effect sensors, which exhibit sinusoidal output signals. Domain effects in bulk crystals, which exhibit three-dimensional domain structure, are less evident than in films.
Proceedings Title
Proc., Intl. Optical Fiber Sensors Conf.
Conference Dates
January 29-31, 1992
Conference Location
Monterey, CA


Deeter, M. (1992), Domain effects in faraday effect sensors based on iron garnets, Proc., Intl. Optical Fiber Sensors Conf., Monterey, CA, [online], (Accessed April 22, 2024)
Created January 1, 1992, Updated February 17, 2017