X-Ray Detected Magnetic Resonance: A New Spectroscopic Tool

摘要

We discuss the information content of X-ray detected magnetic resonance (XDMR), that is, a novel spectroscopy that uses X-ray magnetic circular dichro-ism to probe the resonant precession of local magnetization components in a strong microwave pump field. As XDMR is element- and edge-selective, it appears as a unique tool to resolve the magnetization dynamics of spin and orbital components at any absorbing site. We compare different experimental configurations that we used to get access to element-selective information such as the opening angle and the phase of precession in iron garnet films or single crystals. In YIG thin films, orbital magnetization components measured at the iron sites were shown to couple to magnetostatic waves. We also detected a change in the chirality of the preces-sion of the Fe orbital magnetization components at the compensation temperature of GdIG. Extending XDMR up to sub-THz frequencies would considerably enlarge the range of potential applications of this new spectroscopic tool.