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.
|Journal||Czechoslovak Journal of Physics|
|Publication status||Published - 2002|
- Mössbauer spectroscopy
- Nanocrystalline ferrites
ASJC Scopus subject areas
- Physics and Astronomy(all)