Temperature study of magnetic resonance spectra of co-modified (Co,N)-TiO2 nanocomposites-Reference-Cited by-同舟云学术

Temperature study of magnetic resonance spectra of co-modified (Co,N)-TiO2 nanocomposites

Published:2016-06-01 Issue:2 Volume:34 Page:242-250
ISSN:2083-134X
Container-title:Materials Science-Poland
language:en
Short-container-title:

Author:

Guskos Nikos,Typek Janusz¹,Zolnierkiewicz Grzegorz¹,Guskos Aleksander¹,Berczynski Pawel¹,Dolat Diana²,Mozia Sylwia²,Aidinis Konstantinos³,Kruk Konrad⁴,Morawski Antoni W.²

Affiliation:

1. Department of Physics, West Pomeranian University of Technology, al. Piastow 48, 70-311 Szczecin, Poland

2. Department of Chemical and Environmental Engineering, West Pomeranian University of Technology, al. Piastow 17, 70-310 Szczecin, Poland

3. Department of Electronic, Faculty of Physics, University of Athens, Panepistimioupolis, GR-157 84 Athens, Greece

4. Faculty of Electrical Engineering, West Pomeranian University of Technology, ul. Sikorskiego 37, 70-313 Szczecin, Poland

Abstract

Abstract The (nCo,N)-TiO2 (n = 1, 5 and 10 wt.% of Co) nanocomposites were investigated by magnetic resonance spectroscopy in 4 K to 290 K range. Analyses of ferromagnetic/electron paramagnetic resonance (FMR/EPR) spectra in terms of four Callen lineshape components revealed the existence of two types of magnetic centers, one derived from metallic cobalt nanoparticles in superparamagnetic (SPM) phase and the other from cobalt clusters in the TiO2 lattice. Additionally, at low temperature the EPR spectrum arising from Ti3+ ions was also registered. Both relaxations of the Landau-Lifshitz type and the Bloch-Bloembergen type played an important role at high temperature in determining the linewidths and the latter relaxation was prevailing at low temperature. Analysis of the integrated intensity showed that the SPM signal is due to small size FM cobalt nanoparticles while the paramagnetic signal from Co clusters originates from those nanoparticles in which the concentration of magnetic polarons is below the percolation threshold.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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