Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1740
Título: Ferromagnetic order in aged Co-doped TiO2 anatase nanopowders
Autor: Silvestre, A. J.
Pereira, L.C.J.
Nunes, M.R.
Monteiro, O.C.
Palavras-chave: Co-doped TiO2
Oxide based DMS
Preserved Ferromagnetic Order
Data: 1-Ago-2012
Editora: American Scientific Publishers
Citação: Silvestre A J, Pereira L C J, Nunes M R, Monteiro, O C. Ferromagnetic order in aged Co-doped TiO2 anatase nanopowders. Journal of Nanoscience and Nanotechnology: 2012; Volume 12, Issue 8, 6850-6854.
Relatório da Série N.º: 8;
Resumo: Oxide based diluted magnetic semiconductor (DMS) materials have been a subject of increasing interest due to reports of room temperature ferromagnetism in several systems and their potential use in the development of spintronic devices. However, concerns on the stability of the magnetic properties of different DMS systems have been raised. Their magnetic moment is often unstable, vanishing with a characteristic decay time of weeks or months, which precludes the development of real applications. This paper reports on the ferromagnetic properties of two-year-aged Ti1-xCoxO2-δ reduced anatase nanopowders with different Co contents (0.03≤x≤0.10). Aged samples retain rather high values of magnetization, remanence and coercivity which provide strong evidence for a quite preserved long-range ferromagnetic order. In what concern Co segregation, some degree of metastability of the diluted Co doped anatase structure could be inferred in the case of the sample with the higher Co content.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1740
ISSN: 1533-4880
Aparece nas colecções:ISEL - Física - Artigos

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