Abstract
Several experiments have been carried out on NiO which may be interpreted as confirmation of the suggestion of Néel that antiferromagnetic material in fine particle form should exhibit a weak ferromagnetism and superparamagnetism. The initial susceptibility of the nickel oxide between 22 A and >1000 A increases with decreasing particle size. The susceptibility decreases with decrease in temperature below room temperature for all but the smallest size sample. This sample had a very large susceptibility and an “S”-shaped magnetization curve, characteristic of superparamagnetic material. In the intermediate size range, cooling through the Néel temperature in a field introduces an additional magnetization which is field independent.
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References
L. Néel, Compt. rend. 252, 4075 (1961).
L. Néel, Compt. rend. 253, 9 (1961).
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W. Schuele and V. D. Deetscreek, J. Appl. Phys. 32, 235S (1961).
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G. Foëx, Tables de Constantes et Donnes Numeriques (Masson and Cie, Paris, 1957), Vol. 7, p. 96.
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Schuele, W.J., Deetscreek, V.D. (1962). Appearance of a Weak Ferromagnetism in Fine Particles of Antiferromagnetic Materials. In: Osborn, J.A. (eds) Proceedings of the Seventh Conference on Magnetism and Magnetic Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6391-8_45
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DOI: https://doi.org/10.1007/978-1-4899-6391-8_45
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