Monochromatic, Cicularly Polarized Resonant Radiation in the Investigation of Magnetic Materials

Monochromatic, circularly polarized radiation brings useful information on orientations of hyperfine fields in investigation of magnetic materials. This information can be extracted even from poorly resolved spectra by a model free method. In particular, the z-component of the average hyperfine magnetic field is given simply by a 'center of gravity' of the difference between the spectra measured with two opposite polarizations. The efficiency of such an approach is demonstrated on the example of the 57Fe h.m.f. in bcc Cr-Fe-Mn alloys.