Magnetic study of nanocrystalline Mg-doped lithium ferrite

Marek Pȩkała, Frank J. Berry, Hisham M. Widatallah

Research output: Contribution to journalArticle

Abstract

Nanocrystalline magnesium doped ferrites with grain sizes between 50 and 11 nm were prepared by the ball milling. Magnetization of the non-milled ferrite diminishes monotonically with temperature and vanishes above the relatively high Curie temperature TC of 900 K. A milling process suppresses TC down to 830 K, which reveals the exchange interaction diminishing with the reduced grain sizes. The room temperature magnetic moment per formula unit diminishes from 2.15 μB for non-milled ferrite to 1.27 μB for 11 nm sample. The hyperfine magnetic fields derived from Mössbauer spectra are remarkably suppressed when the grain sizes are reduced below 20 nm.

Original languageEnglish
JournalCzechoslovak Journal of Physics
Volume52
Issue numberSUPPL.A
Publication statusPublished - 2002

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Keywords

  • Magnetization
  • Mössbauer spectroscopy
  • Nanocrystalline ferrites

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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