Affiliation:
1. Institut für Strahlenforschung der Universität Kiel in Lübeck
Abstract
Measurements of magnetic susceptibility in the temperature range 4.2-300°K show that ferritin is antiferromagnetic with a Néel temperature of 20° ± 3°K. The theory of J. S. SMART for antiferromagnetic exchange between iron atoms clustered in groups of two (“isolated clusters”) gives the best agreement between theoretical and experimental values. The antiferromagnetic exchange constant is J/k=- 4.8 (°K). Reduced magnetic moment for µeff =3.85 μB is due to the transfer of two electrons from oxygen atoms to ferric atoms caused on the cation-anion-cation superexchange. Some models of superexchange are discussed. Antiferromagnetism and superexchange are possibly caused on the cubic magnetic structure of iron-oxygen micelles in ferritin.
Cited by
21 articles.
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