Abstract
The effect of gallium substitution on the magnetic hyperfine field of manganese–ferrite at 20 K has been studied by Mössbauer spectroscopy. It was found that the value of the magnetic hyperfine field decreases when a small concentration x of Ga 3+ ions replaces the Fe 3+ ions in MnFe 2− x Ga x O 4. An increase in the magnetic hyperfine field was observed when the amount x of gallium increased ( x ≥ 0.4). No spin canting was observed and all the samples had a collinear structure. The variation of the magnetic hyperfine field with gallium concentration is explained qualitatively on the basis of supertransferred hyperfine interaction.
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