Abstract
MICROWAVE absorption phenomena, similar to those reported by Bickford for magnetite1, have been observed for nickel ferrite in measurements at a wave-length of 3.2 cm. made from room temperature down to −195° C. At the lowest temperatures, two absorption peaks were obtained at 1,490 Oe. and 200 Oe., the latter gradually decreasing with rising temperature and finally disappearing at about −120° C. The value of g and the maximum absorption increase with decreasing temperature. An anomaly in the magnetization, similar to that found by Weiss and Forrer for magnetite2, was observed in the range −120 ° to −195° C, where the magnetization falls suddenly by an amount which is the smaller, the higher the field. Similarly, the electrical resistivity rises suddenly in the same range. These phenomena may be due to a transition between −120° and −195° C.
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References
Bickford, L. R., Phys. Rev., 78, 449 (1950).
Weiss, P., and Forrer, F., Ann. de Phys., [10], 12, 279 (1929).
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OKAMURA, T. Ferromagnetic Resonance Absorption and a New Transition in NiOFe2O3 at Low Temperature. Nature 168, 162 (1951). https://doi.org/10.1038/168162b0
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DOI: https://doi.org/10.1038/168162b0
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