We describe a system for measuring magneto-optical spectra in the 1.5-6-eV photon energy range using a rotating analyzer technique. The measurements are done at a near normal incident angle of less than 2 degrees. A stepping motor with 400 steps per revolution is used to control the analyzer azimuthal angle. After Fourier transformation, the magneto-optical parameter of polar Kerr rotation angle, e is obtained. Magnetic field and spectral scanning, as well as data processing: are totally controlled by a microcomputer. The mechanical and electrical design, alignment, calibration, and error reduction techniques for this sytem are discussed in detail. Application of this system is illustrated for compositionally modulated amorphous (Dy/Co) multi-layer films.
John A. WoolIam,
"Rotating Analyzer Magneto-Optic Spectroscopy", Proc. SPIE 1166, Polarization Considerations for Optical Systems II, (25 January 1990); doi: 10.1117/12.962897; https://doi.org/10.1117/12.962897