Anisotropic ferromagnetism induced in rutile single crystals by Co implantation

J. V. Pinto, M. M. Cruz (), R. C. da Silva, N. Franco, A. Casaca, E. Alves and M. Godinho

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 55, issue 3, 253-260

Abstract: The magnetic and electrical properties of Co-implanted single crystalline TiO 2 rutile are presented. For fluences of the order of 10 17 cm -2 and implantation energy of 150 keV the maximum atomic concentration of cobalt is 13 at% at a depth of 65 nm from the surface. The as implanted single crystals exhibit superparamagnetic behaviour attributed to the formation of nanosized cobalt clusters. After annealing at 1073 K an anisotropic ferromagnetic behaviour emerges with the easy magnetization axis lying in the (001) plane of rutile. The ferromagnetic behaviour is associated with oriented cobalt aggregates. Electrical conductivity of the implanted samples annealed in vacuum also exhibits anisotropic behaviour at low temperatures, but no magnetoresistive effects were detected. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 75.50.Tt Fine-particle systems; nanocrystalline materials, 61.72.Ww Doping and impurity implantation in other materials, 75.50.Dd Nonmetallic ferromagnetic materials, 75.50.Pp Magnetic semiconductors, (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00054-2

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