Hyperfine field distribution in disordered binary alloys

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Abstract
Mossbauer measurements were made on the disordered binary alloys Ni3Fe NiFe and FeCo at different temperatures and the distribution of hyperfine magnetic fields has been evaluated using a model-independent method of analysis proposed by Window (1971). The full width at half-maximum of the P(H) distribution is found to remain constant for Ni3Fe with respect to temperature. It increases for NiFe but decreases for FeCo with increase of temperature. The full width at half-maximum is correlated to the exchange interaction and the measurements show that the range of exchange interaction is shorter in NiFe than in Ni3Fe. In FeCo all the atoms are found to have the same magnetic ordering temperature. The reduced value of the average field for NiFe is fitted to the Brillouin function.