Room temperature ferromagnetism in undoped and Fe doped ZnO nanorods: Microwave-assisted synthesis

Mukta V. Limaye, Shashi B. Singh, Raja Das, Pankaj Poddar, Sulabha K. Kulkarni

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)

Abstract

One-dimensional (1D) undoped and Fe doped ZnO nanorods of average length ∼1 μm and diameter ∼50 nm have been obtained using a microwave-assisted synthesis. The magnetization (M) and coercivity (H c) value obtained for undoped ZnO nanorods at room temperature is ∼5×10-3 emu/g and ∼150 Oe, respectively. The Fe doped ZnO samples show significant changes in M H loop with increasing doping concentration. Both undoped and Fe doped ZnO nanorods exhibit a Curie transition temperature (Tc) above 390 K. Electron spin resonance and Mssbauer spectra indicate the presence of ferric ions. The origin of ferromagnetism in undoped ZnO nanorods is attributed to localized electron spin moments resulting from surface defects/vacancies, where as in Fe doped samples is explained by F center exchange mechanism.

Original languageEnglish
Pages (from-to)391-400
Number of pages10
JournalJournal of Solid State Chemistry
Volume184
Issue number2
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

Keywords

  • Diluted magnetic semiconductors
  • Nanostructures
  • ZnO

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