Defect-induced reversible ferromagnetism in hydrogenated ZnO:Co

Through simple hydrogen annealing treatment, we observed robust inducement of room temperature ferromagnetism (RTFM) in ZnO:Co (5%) pellets. The hydrogen mediated magnetic transition is accompanied by electronic structure plus bonding modifications with no structural deviations or creation of second...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-08, Vol.322 (15), p.2187-2190
Main Authors: Singhal, R.K., Samariya, A., Kumar, Sudhish, Xing, Y.T., Deshpande, U.P., Shripathi, T., Baggio-Saitovitch, E.
Format: Article
Language:English
Subjects:
Bonding
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Deviation
Diluted magnetic semiconductor
Electronic structure
Evaporation
Exact sciences and technology
Ferromagnetism
Hydrogen storage
Hydrogenation
Magnetic properties and materials
Magnetic semiconductors
Magnetic transitions
Oxygen vacancy
Phases
Physics
Spectroscopy
Studies of specific magnetic materials
X-ray photoelectron
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Summary:Through simple hydrogen annealing treatment, we observed robust inducement of room temperature ferromagnetism (RTFM) in ZnO:Co (5%) pellets. The hydrogen mediated magnetic transition is accompanied by electronic structure plus bonding modifications with no structural deviations or creation of secondary phases, as evidenced by XRD and photoemission investigations. Our findings reveal a route correlation of oxygen vacancies with the observed RTFM. In particular, we systematically investigated the time controlled re-heating consequences on hydrogenated sample. The H-induced RTFM and subsequent modifications viz. electronic structure, transport properties and bonding effect gradually retrace back upon evaporating the hydrogen.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2010.02.007