Self-biased magneto-optical films based on CoFe 2 O 4 –silica nanocomposite
| Autor: | M.-F. Blanc-Mignon, Y. Lefkir, Sophie Neveu, Francois Royer, Damien Jamon, Fadi Choueikani |
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| Přispěvatelé: | Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Hubert Curien [Saint Etienne] (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Physics::Optics General Physics and Astronomy Nanoparticle 02 engineering and technology Substrate (electronics) engineering.material 7. Clean energy 01 natural sciences Condensed Matter::Materials Science symbols.namesake Coating 0103 physical sciences Faraday effect Figure of merit Thin film ComputingMilieux_MISCELLANEOUS 010302 applied physics [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Birefringence business.industry 021001 nanoscience & nanotechnology Magnetic anisotropy engineering symbols Optoelectronics 0210 nano-technology business |
| Zdroj: | Journal of Applied Physics Journal of Applied Physics, American Institute of Physics, 2021, 129 (2), pp.023101. ⟨10.1063/5.0032620⟩ |
| ISSN: | 0021-8979 1089-7550 |
| Popis: | Composite thin films made of cobalt ferrite nanoparticles embedded in silica/zirconia sol-gel matrix are presented, and their versatility is illustrated through the impact of the nanoparticle features on the films’ final properties. The intrinsic magneto-optical potentiality of the nanoparticles is especially given by a peak around 1550 nm in the spectra of both the Faraday rotation and the magneto-optical figure of merit. These nanoparticles are inserted in the liquid preparation of a sol-gel host matrix, which is coated on a glass substrate at soft temperature. SEM and optical analysis show the absence of nanoparticle aggregates and defects into thin films and prove the ability of these films to be used as a guiding layer for photonic integration. The dispersion in the host matrix and the integration on a substrate do not affect the merit factor of the material. The specific Faraday rotation of the films is about 300 ° / cm for a volume fraction of nanoparticles of 1.5%, and it possesses a hysteresis loop. Its dependence on the nanoparticle mean size offers the possibility to achieve self-biased behavior. In addition, a magnetic field applied during the coating promotes an alignment of the magnetic easy axis of the nanoparticles along a preferential direction. It allows increasing even more the remanent magneto-optical effect and also reducing the birefringence and reaching a TE/TM phase matching of the film guided modes. It gives a way to tune these two parameters that play a crucial role in magneto-optical devices. |
| Databáze: | OpenAIRE |
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