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American Scientific Publishers, Journal of Nanoscience and Nanotechnology, 8(12), p. 6850-6854, 2012

DOI: 10.1166/jnn.2012.4550

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Ferromagnetic order in aged Co-doped TiO2 anatase nanopowders

Journal article published in 2010 by A. J. Silvestre ORCID, L. C. J. Pereira ORCID, M. R. Nunes, O. C. Monteiro
This paper is available in a repository.
This paper is available in a repository.

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Abstract

This paper reports on the ferromagnetic properties of aged Ti(1-x)CoxO(2-delta) anatase nanopowders with different Co contents (0.03 < or = x < or = 0.10). It is shown for the first time that aged Co:TiO2 anatase samples retain rather high values of magnetization (M), remanence (Mr) and coercivity (Hc) which provide strong evidence for a preserved long-range ferromagnetic order. Room temperature M, Mr and Hc values were measured in the ranges of [0.05, 0.79] microB/Co, [0.044, 0.096] microB/Co and [366.7,494.8]Oe, respectively, which are in the same range as in general reported either for newly prepared thin films or nanoparticles.