Spectroscopic Studies on van der Waals Magnetic Materials

Optical spectroscopic tools are extensively utilized in the study of van der Waals magnetic materials. The small volume of atomically thin specimens renders traditional measurement tools such as magnetic susceptibility measurements or neutron scattering experiment inadequate. Optical measurements, on the other hand, can have a spatial resolution on the order of the focus size of the probing beam and are often sensitive enough to probe atomically thin samples. Several optical spectroscopy techniques have demonstrated to be capable of probing various physical properties of these materials. Raman spectroscopy, terahertz spectroscopy, photoluminescence, optical absorption, and second harmonic generation have been applied to various magnetic van der Waals materials and have shown to be particularly powerful in the studies of antiferromagnetic van der Waals materials.