| 摘要 |
<p>PURPOSE: To provide high detection sensitivity, and reduce a measurement error through the application of simple constitution for the elimination of an electrical correction circuit by keeping the magnetization of a magneto-optical element or the magnetic field dependency of a Faraday rotation angle, almost free from hysteresis. CONSTITUTION: The first polarizer 10, a film magneto-optical element 12, and the second polarizer 14 are arrayed in order and measuring light from a light source 16 is introduced through the first polarizer 10 for being vertically incident on the film surface of the element 12. The light so transmitted light is introduced through the second polarizer 14, and measured with a photodetector 18. In this case, the element 12 is made to grow by a liquid-phase epitaxial method, and such a film as available from the thermal treatment of a bismuth substituted iron garnet monocrystal film having a compensation temperature in a top condition at temperature between 1,110 deg.C and 1,190 deg.C and within nine hours.</p> |
