- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Light scattering from the critical modes of the Verwey transition in magnetite
摘要： We present inelastic light scattering data on a single crystal of magnetite (Fe3O4) across the Verwey transition. We identify anomalies of the lattice vibrations that originate from strong coupling to electronic excitations. We reveal spectroscopic signatures of diffusive modes in the electronic contribution to the Raman response function. We thereby provide information on the critical dynamics and the hierarchy of the structural and electronic modes in the mechanism of the Verwey transition.
关键词： Raman spectroscopy,Verwey transition,critical dynamics,inelastic light scattering,magnetite
更新于2025-09-23 15:21:21
-
Tailoring coupling between light and spin waves with dual photonic-magnonic resonant layered structures
摘要： We report on judiciously designed stratified periodic structures of magnetic dielectric materials with a localized defect layer, which are able to concurrently confine light and spin waves in the same ultra-small defect region for a long time period, thus resulting in enhanced photon-magnon interaction and large dynamic optical frequency shift. Our results for a specific realization of such a one-dimensional, so-called photomagnonic, crystal magnetized at saturation perpendicular to the interfaces, obtained by means of rigorous calculations using scattering-matrix techniques, show that the inherently weak coupling between visible/near-infrared light and GHz-frequency spin waves can be greatly increased leading to strong modulation of the optical field through multi-magnon exchange mechanisms. Such novel multifunctional composite materials offer a promising platform for tailoring light–spin-wave coupling in view of fast and energy-efficient spin-optical information processing applications.
关键词： Inelastic Light Scattering,Photomagnonic Crystal,Magneto-optics,Spin Waves
更新于2025-09-23 15:21:01