Czechoslovak Journal of Physics
Volume 52, Supplement 1, A93-A96, DOI: 10.1007/s10582-002-0021-4

Superparamagnetism and collective magnetic excitations in nanoscale milled spinel ferrite

V. Šepelák, D. Mienert, D. Baabe, P. Petrovič and K. D. Becker

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Abstract

The changes in magnesium ferrite (MgFe2O4) caused by high-energy milling are investigated by means of Mössbauer spectroscopy. A collapse of the magnetic hyperfine fields far below the Néel temperature of the bulk ferrite is observed in nanoscale milled MgFe2O4. The influence of superparamagnetism and collective magnetic excitations on Mössbauer spectra of milled material taken at different temperatures is discussed.

PACS  75.50.Tt - 61.18.Fs

Key words  relaxation effect - high-energy milling - nanocrystalline spinel ferrite

Presented at 11-th Czech and Slovak Conference on Magnetism, Košice, 20–23 August 2001

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