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Title: On the role of Fe ions on magnetic properties of doped TiO{sub 2} nanoparticles

The role of iron doping on magnetic properties of hydrothermal anatase TiO{sub 2}:{sup 57}Fe (0–1 at. %) nanoparticles is investigated by combining superconducting quantum interference device magnetometry with Mössbauer and electron paramagnetic resonance techniques. The results on both as-prepared and thermally treated samples in reduced air atmosphere reveal complexity of magnetic interactions, in connection to certain iron ion electron configurations and defects (oxygen vacancies, F-center, and Ti{sup 3+} ions). The distribution of iron ions is predominantly at nanoparticle surface layers. Formation of weak ferromagnetic domains up to 380 K is mainly related to defects, supporting the bound magnetic polaron model.
Authors:
; ; ; ;  [1]
  1. National Institute of Materials Physics (NIMP), Mǎgurele-Ilfov 077125 (Romania)
Publication Date:
OSTI Identifier:
22398857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; DOPED MATERIALS; ELECTRON SPIN RESONANCE; ELECTRONS; F CENTERS; IRON; IRON 57; IRON IONS; LAYERS; MAGNETIC PROPERTIES; MOESSBAUER EFFECT; NANOPARTICLES; OXYGEN; POLARONS; SQUID DEVICES; SURFACES; TEMPERATURE DEPENDENCE; TITANIUM IONS; TITANIUM OXIDES