The circular dichroic charge-magnetic interference effect in resonant x-ray diffraction (RXD) is reported for antiferromagnetic (AFM) materials. The polarization dependence of the scattering cross-section was formulated, and the conditions that the interference gives rise to circular dichroic RXD signals for AFM materials were clarified. By using the interference effect, a pair of AFM domains can be distinguished in certain conditions. We applied this effect to observe collinear chirality AFM domains in a high-temperature magnetoelectric hexaferrite, Ba1.3Sr0.7CoZnFe11AlO22. Despite its collinear spin arrangement and absence of macroscopic magnetization, the domains are clearly visualized by a circularly polarized x-ray beam. The present result shows that various types of AFM domains including collinear ones can be examined by utilizing the charge-magnetic interference effect, together with the well-established circular dichroism on RXD emerged from pure magnetic scattering.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics