A method is described for measuring the amplitude and phase of the complex Kerr magnetooptic coefficients. A magnetic metal surface to be measured is switched between its magnetic states at an ac rate, thereby modulating a reflected light beam. By measuring the modulation depth with a synchronous detector and one angle, the two quantities above are determined. The method requires no precision optical equipment as is needed with polarimetric techniques.
Carl F. Buhrer, "A Simple ac Photometric Method for Measuring Complex Kerr Magnetooptic Coefficients," Appl. Opt. 5, 1015-1017 (1966)