Giant magneto-optical response in H+ irradiated Zn1−xCoxO thin films
| Autor: | A. Di Trolio, Francesco Pineider, Antonio Polimeni, Paolo Mengucci, A. Amore Bonapasta, Gianni Barucca, Alessio Gabbani, Gaspare Varvaro, C. de Julián Fernández, A.M. Testa |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
zno thin films Band gap dilute magnetic semiconductors dilute magnetic semiconductor 02 engineering and technology 010402 general chemistry 01 natural sciences Spectral line symbols.namesake Condensed Matter::Materials Science Impurity Phenomenological model Faraday effect Materials Chemistry Thin film H+ irradiation Co doped ZnO films Condensed matter physics Magnetic circular dichroism General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences magneto-optical materials Ferromagnetism magnetism symbols laser ablation Faraday rotation 0210 nano-technology magneto-optic magnetic circular dichroism |
| Zdroj: | JOURNAL OF MATERIALS CHEMISTRY C 7 (2019): 78–85. doi:10.1039/c8tc03563f info:cnr-pdr/source/autori:Varvaro G.; Di Trolio A.; Polimeni A.; Gabbani A.; Pineider F.; De Julian Fernandez C.; Barucca G.; Mengucci P.; Amore Bonapasta A.; Testa A.M./titolo:Giant magneto-optical response in H+ irradiated Zn1-xCoxO thin films/doi:10.1039%2Fc8tc03563f/rivista:JOURNAL OF MATERIALS CHEMISTRY C/anno:2019/pagina_da:78/pagina_a:85/intervallo_pagine:78–85/volume:7 Journal of materials chemistry. C 7 (2019): 78. doi:10.1039/C8TC03563F info:cnr-pdr/source/autori:G. Varvaro, A. Di Trolio, A. Polimeni, A. Gabbani, F. Pineider, C. de Julián Fernández, G. Barucca, P. Mengucci, A. Amore Bonapasta and A.M.Testa/titolo:Giant magneto-optical response in H+ irradiated Zn1-xCoxO thin films/doi:10.1039%2FC8TC03563F/rivista:Journal of materials chemistry. C (Print)/anno:2019/pagina_da:78/pagina_a:/intervallo_pagine:78/volume:7 |
| DOI: | 10.1039/c8tc03563f |
| Popis: | Remarkable improvements in the magneto-optical properties of Zn1-xCoxO thin films were achieved by post-growth hydrogen irradiation at temperatures of 400 degrees C. Hydrogen incorporation increases the magnetic circular dichroism signal resulting in large values of ellipticity and Faraday rotation at room temperature. The hysteretic behavior of the magneto-optical field dependent loops at different sub-bandgap wavelengths indicates an intrinsic ferromagnetic regime. A giant Faraday rotation of 3000 deg cm(-1) was observed at 400 nm. Optical, structural and microstructural characterizations pointed out the Zn substitution by Co, ruling out the presence of noticeable Co-related secondary phases down to the nanoscale. The increased values of saturation magnetization, ellipticity and Faraday rotation have been explained based on an impurity band close to the conduction band minimum, which is induced by Co-V-O (O vacancies) complexes. A phenomenological model founded on such an impurity band and electronic states induced by other Co-defect complexes in the ZnO energy gap allows a thoroughly novel, fine interpretation of the ellipticity spectra. |
| Databáze: | OpenAIRE |
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