Optical and magneto-optical interactions in Co-doped CeO2 thin films prepared by pulsed laser deposition
Martin Zahradník, Miroslav Kučera, Roman Antoš, Martin Veis, Jan Mistrík, Lei Bi, Hyun-Suk Kim, Caroline A. Ross
Abstract
Magnetically doped CeO2 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 Ce1-xCoxO2-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 CeO2 was inferred. The full permittivity-tensor spectra are provided for further use in prospective modelling of magneto-optical device concepts.
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