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Title: Long-range ferromagnetic order induced by a donor impurity band exchange in SnO{sub 2}:Er{sup 3+} nanoparticles

In this work, the structural and magnetic properties of Er-doped SnO{sub 2} (SnO{sub 2}:Er) nanoparticles are reported. The SnO{sub 2}:Er nanoparticles have been synthesized by a polymer precursor method with Er content from 1.0% to 10.0%. X-ray diffraction results indicate the formation of only the rutile-type structure in all samples. The estimated mean crystallite size shows a decrease from ∼10 to ∼4 nm when the Er content is increased from 1.0% to 10.0%. The particle size values have been corroborated by transmission electron microscopy technique. The thermal dependence of the magnetization is consistent with the 3+ oxidation state of erbium ions for all samples. A strong paramagnetic-like behavior coexisting with a ferromagnetic phase has been determined for samples with Er content below 5.0%. Above this concentration, only a paramagnetic behavior has been determined. Isothermal magnetization curves are consistent with the occurrence of long-range ferromagnetic order mediated by donor electrons forming bound magnetic polarons which overlap to produce a spin-split impurity band.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Núcleo de Física Aplicada, Institute of Physics, University of Brasília, Brasília DF 70910-900 (Brazil)
  2. Instituto de Física, Universidade de São Paulo, São Paulo, SP 05508-000 (Brazil)
  3. Faculdade Gama-FGA, Sector Central Gama, Universidade de Brasília, Brasília, DF72405-610 (Brazil)
  4. Instituto de Química, Universidade de São Paulo, São Paulo, SP 05508-000 (Brazil)
Publication Date:
OSTI Identifier:
22258738
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCENTRATION RATIO; DOPED MATERIALS; ELECTRONIC STRUCTURE; ERBIUM IONS; IMPURITIES; MAGNETIC PROPERTIES; MAGNETIZATION; NANOSTRUCTURES; PARAMAGNETISM; PARTICLE SIZE; PARTICLES; RUTILE; TIN OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION