Percolative Ferromagnetism in Anatase Co:TiO2

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dc.creatorShinde, S. R.
dc.creatorOgale, S. B.
dc.creatorOgale, Abhijit S.
dc.creatorWelz, S. J.
dc.creatorLussier, A.
dc.creatorKundaliya, Darshan C.
dc.creatorZheng, H.
dc.creatorDhar, S.
dc.creatorRao, M. S. R.
dc.creatorRamesh, R.
dc.creatorIdzerda, Y. U.
dc.creatorBrowning, N. D.
dc.creatorVenkatesan, T.
dc.date2005-05-10
dc.date.accessioned2026-07-07T03:05:10Z
dc.date.available2026-07-07T03:05:10Z
dc.descriptionWe revisit the most widely investigated and controversial oxide diluted magnetic semiconductor (DMS), Co:TiO2, with a new high temperature film growth, and show that the corresponding material is not only an intrinsic DMS ferromagnet, but also supports a percolative mechanism of ferromagnetism. We establish the uniformity of dopant distribution across the film cross section by Z-contrast imaging via scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) at spatial resolution of 0.4 nm and the oxidized 2+ valence state of cobalt by x-ray absorption spectroscopy (XAS). The dependence of magnetic properties on cobalt concentration is consistent with the defect polaron percolation model. The peculiar increase in the transport activation energy above a specific cobalt concentration further emphasizes the polaron contribution to magnetic order.
dc.description21 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0505265
dc.identifierhttp://arxiv.org/abs/cond-mat/0505265
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26348
dc.subjectMaterials Science
dc.titlePercolative Ferromagnetism in Anatase Co:TiO2
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