Ferromagnetism in Fe-doped ZnO Nanocrystals: Experimental and Theoretical investigations

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dc.creatorKarmakar, Debjani
dc.creatorMandal, S. K.
dc.creatorKadam, R. M.
dc.creatorPaulose, P. L.
dc.creatorRajarajan, A. K.
dc.creatorNath, T. K.
dc.creatorDas, A. K.
dc.creatorDasgupta, I.
dc.creatorDas, G. P.
dc.date2007-02-22
dc.date.accessioned2026-07-07T07:48:07Z
dc.date.available2026-07-07T07:48:07Z
dc.descriptionFe-doped ZnO nanocrystals are successfully synthesized and structurally characterized by using x-ray diffraction and transmission electron microscopy. Magnetization measurements on the same system reveal a ferromagnetic to paramagnetic transition temperature > 450 K with a low-temperature transition from ferromagnetic to spin-glass state due to canting of the disordered surface spins in the nanoparticle system. Local magnetic probes like EPR and Mossbauer indicate the presence of Fe in both valence states Fe2+ and Fe3+. We argue that the presence of Fe3+ is due to the possible hole doping in the system by cation (Zn) vacancies. In a successive ab-initio electronic structure calculation, the effects of defects (e.g. O- and Zn-vacancy) on the nature and origin of ferromagnetism are investigated for Fe-doped ZnO system. Electronic structure calculations suggest hole doping (Zn-vacancy) to be more effective to stabilize ferromagnetism in Fe doped ZnO and our results are consistent with the experimental signature of hole doping in the ferromagnetic Fe doped ZnO samples.
dc.description56 pages,16 figures. accepted for publication in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0702525
dc.identifierhttp://arxiv.org/abs/cond-mat/0702525
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/124388
dc.subjectMaterials Science
dc.titleFerromagnetism in Fe-doped ZnO Nanocrystals: Experimental and Theoretical investigations
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