Jump to main content
Jump to site search


Giant magneto-optical response in H+ irradiated Zn1−xCoxO thin films

Author affiliations

Abstract

Remarkable improvements in the magneto-optical properties of Zn1−xCoxO thin films were achieved by post-growth hydrogen irradiation at temperatures of 400 °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–VO (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.

Graphical abstract: Giant magneto-optical response in H+ irradiated Zn1−xCoxO thin films

Back to tab navigation

Publication details

The article was received on 18 Jul 2018, accepted on 21 Nov 2018 and first published on 21 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC03563F
Citation: J. Mater. Chem. C, 2019, Advance Article
  •   Request permissions

    Giant magneto-optical response in H+ irradiated Zn1−xCoxO thin films

    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, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC03563F

Search articles by author

Spotlight

Advertisements