Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/92586
Title: Dimerization and low-dimensional magnetism in nanocrystalline TiO2 semiconductors doped by Fe and Co
Authors: Yermakov, A.
Boukhvalov, D.
Uimin, M.
Mesilov, V.
Minin, A.
Galakhov, V.
Korolyov, A.
Volegov, A.
Rosenfeld, E.
Gubkin, A.
Molochnikov, L.
Issue Date: 2019
Publisher: Institute of Physics Publishing
Citation: Dimerization and low-dimensional magnetism in nanocrystalline TiO2 semiconductors doped by Fe and Co / A. Yermakov, D. Boukhvalov, M. Uimin, V. Mesilov, et al.. — DOI 10.1088/1742-6596/1389/1/012026 // Journal of Physics: Conference Series. — 2019. — Vol. 1. — Iss. 1389. — 12026.
Abstract: The report is devoted to an analysis of the structural and magnetic state of the nanocrystalline diluted magnetic semiconductors based on TiO2 doped with Fe and Co atoms. Structural and magnetic characterization of samples was carried out using X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), electron paramagnetic resonance (EPR) spectroscopy, SQUID magnetometry, and the density functional theory (DFT) calculations. Analysis of the experimental data suggests the presence of non-interacting paramagnetic Fe3+ and Co2+ ions in the high-spin state and negative exchange interactions between them. The important conclusions is that the distribution of dopants in the TiO2 matrix, even at low concentrations of 3d-metal dopant (less than one percent), is not random, but the 3d ions localization and dimerization is observed both on the surface and in the nanoparticles core. Thus, in the paper the quantum mechanical model for describing the magnetic properties of TiO2:(Fe, Co) was suggested. The model operates only with two parameters: paramagnetic contribution of non-interacting 3d-ions and dimers having different exchange interactions between 3d magnetic carriers. © Published under licence by IOP Publishing Ltd.
Keywords: DENSITY FUNCTIONAL THEORY
DIMERIZATION
EXCHANGE INTERACTIONS
HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY
IONS
IRON
MAGNETIC SEMICONDUCTORS
MAGNETOMETRY
METAL NANOPARTICLES
NANOCRYSTALS
OXIDE SEMICONDUCTORS
PARAMAGNETIC RESONANCE
PARAMAGNETISM
TIO2 NANOPARTICLES
TITANIUM DIOXIDE
X RAY ABSORPTION SPECTROSCOPY
X RAY DIFFRACTION ANALYSIS
ELECTRON PARAMAGNETIC RESONANCE SPECTROSCOPY
LOW CONCENTRATIONS
LOW-DIMENSIONAL MAGNETISM
MAGNETIC CHARACTERIZATION
NANOCRYSTALLINE TIO2
PARAMAGNETIC CONTRIBUTION
QUANTUM MECHANICAL MODEL
SQUID MAGNETOMETRY
ELECTRON SPIN RESONANCE SPECTROSCOPY
URI: http://hdl.handle.net/10995/92586
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85076586619
WOS ID: 000562319800026
PURE ID: 11729395
ISSN: 1742-6588
DOI: 10.1088/1742-6596/1389/1/012026
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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