Magnetic study of nanocrystalline Mg-doped lithium ferrite

Pekala, M.; Berry, F. and Widatallah, H.M. (2002). Magnetic study of nanocrystalline Mg-doped lithium ferrite. Czechoslovak Journal of Physics, 52 A101-A104.


Nanocrystalline magnesium doped ferrites with grain sizes between 60 and 11 run were prepared by the ball milling. Magnetization of the iron-milled ferrite diminishes monotonically with temperature and vanishes above the relatively high Curie temperature T-C of 900 K. A milling process suppresses TC down to 830 K, which reveals the exchange interaction diminishing with tire reduced grain sizes. Tire room temperature magnetic moment per formula unit diminishes from 2.15 mu(B) for non-milled ferrite to 1.27 mu(B) for 11 run sample. Tire hyperfine magnetic fields derived from Mossbauer spectra are remarkably suppressed where the grain sizes are reduced below 20 nm.

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