Measurement of Magneto-optical M-H Hysteresis Loop of Magnetic Garnet Crystal Film using High-power LED Light Source

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  • 白色LED光源を利用した磁性ガーネット結晶膜のM-H曲線の光学的測定
  • ハクショク LED コウゲン オ リヨウ シタ ジセイ ガーネット ケッショウマク ノ M-H キョクセン ノ コウガクテキ ソクテイ

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Abstract

Magnetic domain pattern of thin film with the perpendicular magnetic anisotropy can be observed by a polarizing microscope with a halogen or high-pressure mercury light source. However, it is difficult to measure the magneto-optical M-H hysteresis curve of the film by the microscope. Because, the halogen and mercury lamps are not stable and include much light noise. We noticed this fact and developed a new system capable of both domain observation and tracing of M-H loop by replacing the halogen lamp with a high-power white LED light panel. And we succeeded in the measurement of noise-free magneto-optical M-H loop of a magnetic garnet thin film.

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