ストライプ磁区構造を有するガーネット単結晶を用いた光磁界センサ(計測・高周波デバイス)

概要

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Magnetic field optical sensors based on the Faraday effect using (TbY)IG single crystals with a striped magnetic domain structure are proposed. It is assumed that the magnetization perpendicular to the striped magnetic domains in (TbY)IG crystals occurs through a rotation of the magnetization, giving rise to a linear magnetization curve like that of Isoperm. This assumption is confirmed by optical measurements. The characteristics of a reflectiontype sensor using these crystals were measured at a wavelength of 1.3 μm. The obtained sensitivity was 5.5×10^<-3>%/A/m, and a good linearity of the sensor output was obtained over a wide dynamic range between 2A/m to 10^2A/m. A noise-equivalent magnetic field of 2.1×10^<-1>A/m was also obtained. The experimental results are explained well by the proposed magnetization process model.
社団法人日本磁気学会の論文
2006-05-01