AI 中文总结
本研究针对钴掺杂CeO₂铁磁性起源不明的问题，采用脉冲激光沉积制备不同掺杂比例的薄膜，通过光谱测量揭示相关跃迁，推断钴掺杂对铁磁性的关键影响，提供介电张量光谱供器件建模使用。
AI 中文摘要
磁性掺杂的CeO₂是一种稀磁半导体，在光子学领域有多种应用前景，但其铁磁性的起源尚未完全明晰。本研究采用脉冲激光沉积法在MgO衬底（x=0.05和0.10）及氧化Si衬底（x=0.20）上制备了Ce₁₋ₓCoₓO₂₋δ薄膜，通过光谱椭偏术和磁光光谱学对其进行系统研究，获取了对角与非对角介电张量元素。对角光谱揭示了氧与铈态间的两个光学跃迁，非对角光谱则揭示了涉及钴离子的两个顺磁跃迁，据此推断钴掺杂对CeO₂铁磁性具有关键影响，研究提供了完整的介电张量光谱，可供未来磁光器件概念的建模使用。
英文摘要
Magnetically doped CeO$_2$ is a dilute magnetic semiconductor, promising for various applications in photonics, but the origin of its ferromagnetic properties is not fully understood. Here, thin films of Ce$_{1-x}$Co$_x$O$_{2-δ}$ prepared by pulsed laser deposition on MgO ($x=0.05$ and $0.10$) and oxidized Si ($x=0.20$) substrates were systematically studied by spectroscopic ellipsometry and magneto-optical spectroscopy. Both diagonal and off-diagonal permittivity-tensor elements were obtained. Diagonal spectra revealed two optical transitions between oxygen and cerium states. Off-diagonal spectra revealed two paramagnetic transitions involving cobalt ions, from which an essential influence of cobalt doping on resulting ferromagnetic properties of CeO$_2$ was inferred. The full permittivity-tensor spectra are provided for further use in prospective modelling of magneto-optical device concepts.
Comments13 pages, 6 figures
