Strong Room-Temperature Ferromagnetism in Co2+-Doped TiO2 made from Colloidal Nanocrystals

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dc.creatorBryan, J. Daniel
dc.creatorHeald, Steve M.
dc.creatorChambers, Scott A.
dc.creatorGamelin, Daniel R.
dc.date2004-07-16
dc.date.accessioned2026-07-07T02:59:15Z
dc.date.available2026-07-07T02:59:15Z
dc.descriptionColloidal cobalt-doped TiO2 (anatase) nanocrystals were synthesized and studied by electronic absorption, magnetic circular dichroism, transmission electron microscopy, magnetic susceptibility, cobalt K-shell X-ray absorption spectroscopy, and extended X-ray absorption fine structure measurements. The nanocrystals were paramagnetic when isolated by surface-passivating ligands, weakly ferromagnetic (Ms = 1.5 x 10-3 mB/Co2+ at 300 K) when aggregated, and strongly ferromagnetic (up to Ms = 1.9 mB/Co2+ at 300 K) when spin-coated into nanocrystalline films. X-ray absorption data reveal that cobalt is in the Co2+ oxidation state in all samples. In addition to providing strong experimental support for the existence of intrinsic ferromagnetism in cobalt-doped TiO2, these results demonstrate the possibility of using colloidal TiO2 diluted magnetic semiconductor nanocrystals as building blocks for assembly of ferromagnetic semiconductor nanostructures with potential spintronics applications.
dc.descriptionTo be published in the Journal of the American Chemical Society
dc.identifierhttps://arxiv.org/abs/cond-mat/0407451
dc.identifierhttp://arxiv.org/abs/cond-mat/0407451
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24438
dc.subjectMaterials Science
dc.titleStrong Room-Temperature Ferromagnetism in Co2+-Doped TiO2 made from Colloidal Nanocrystals
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