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Fe charge state adjustment in ZnO upon ion implantation (Articolo in rivista)

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Fe charge state adjustment in ZnO upon ion implantation (Articolo in rivista) (literal)

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R Mantovan1, H P Gunnlaugsson2, D Naidoo3, S Ólafsson4, K Johnston5, H Masenda3, T E Mølholt4, K Bharuth-Ram6,7, M Fanciulli1,8, H P Gislason4, G Langouche9, R Sielemann10, G Weyer2 and The ISOLDE Collaboration5 (2012)
Fe charge state adjustment in ZnO upon ion implantation
in Journal of physics. Condensed matter (Online); IOP PUBLISHING, BRISTOL (Regno Unito)
(literal)

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R Mantovan1, H P Gunnlaugsson2, D Naidoo3, S Ólafsson4, K Johnston5, H Masenda3, T E Mølholt4, K Bharuth-Ram6,7, M Fanciulli1,8, H P Gislason4, G Langouche9, R Sielemann10, G Weyer2 and The ISOLDE Collaboration5 (literal)

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1 Laboratorio MDM, IMM-CNR, Via Olivetti 2, I-20864 Agrate Brianza (MB), Italy 2 Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark 3 School of Physics, University of the Witwatersrand, South Africa 4 Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland 5 PH Dept, ISOLDE/CERN, 1211 Geneva 23, Switzerland 6 School of Physics, University of KwaZulu-Natal, Durban 4001, South Africa 7 iThemba LABS, PO Box 722, Somerset West 7129, South Africa 8 Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, Milano, Italy 9 Instituut voor Kern-en Stralings fysika, University of Leuven, B-3001 Leuven, Belgium 10 Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany (literal)

Titolo

Abstract

The influence of the ion implantation process on the charge state of dilute 57Fe impurities implanted as radioactive 57Mn in ZnO is investigated by 57Fe emission Mössbauer spectroscopy. One sample is additionally implanted with stable 23Na impurities. Both Fe2+ and Fe3+ charge states are observed, and the Fe3+/Fe2+ ratio is found to increase with the fluence of both 57Mn/57Fe and 23Na ions, demonstrating that the build-up of Fe3+ is not related to the chemical nature of the implanted ions. The results are interpreted in terms of radiation damage induced changes of the Fermi level, and illustrate that the Fe3+/Fe2+ ratio can be adjusted by ion implantation. The spin-lattice relaxation time for Fe3+ in ZnO is found to be independent of the implantation fluence, and is evidently an intrinsic property of the system. (literal)

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