Physics Colloquium – Jong-Woo Kim

Studying Magnetism with Resonant X-ray Scattering at Advanced Photon Source

Jong-Woo Kim, Physicists
Magnetic Material Group/Advanced Photon Source, Argonne National Laboratory

X-ray scattering at synchrotron facilities such as the Advanced Photon Source provides a powerful platform for investigating magnetic order with element and orbital specificity. In this colloquium, I will introduce the fundamentals of single-crystal X-ray diffraction and the principles of resonant elastic X-ray scattering (REXS), emphasizing how tuning to absorption edges enhances sensitivity to electronic and magnetic structures.

I will then discuss the microscopic origin of X-ray magnetic scattering and its unique ability to probe spin, orbital, and multipolar order. Finally, selected examples from complex oxides and correlated materials will illustrate how these techniques reveal emergent magnetic phenomena that are difficult to access with conventional probes.