Abstract
IT is well known that certain ferrites, especially CoFe ferrite1, become magnetically anisotropic when heated in a magnetic field. This treatment results in an increased remanence ratio (Irem/Isat) and a square hysteresis loop. The explanation in terms of an ionic diffusion ordering process has been well developed2. It is also well known3 that annealing in a unidirectional field results in a loop which appears displaced along the H-axis, but no adequate explanation has been given for the phenomenon in these materials. Glaister and Viney4 have reported re-entrant hysteresis loops in these materials, and offered a tentative explanation for this phenomenon.
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References
Wijn, H. P. J., Van der Heide, H., and Fast, J. F., Proc. Inst. Elec. Eng., 104, B, 412 (1957).
Slonczewski, J. C., in Magnetism, edit. by Rado, G. T.; and Suhl, H., 1, 205 (Academic Press, New York, 1963).
Smit, J., and Wijn, H. P. J., in Ferrites, 312 (Cleaver-Hume Press, 1959).
Glaister, R. M., and Viney, I. V. F., Proc. Intermag. Cong., 1965, Paper 4.1 (Inst. Elec. Electron Eng., 1965).
Iida, S., and Inoue, T., J. Phys. Soc. (Japan), 17, Supplement B–1, 281 (1962).
Menyuk, N., and Goodenough, J. B., J. App. Phys., 26, 8 (1955).
Glaister, R. M., and Lee, E. W., patent application 17043/65.
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GLAISTER, R., LEE, E. Re-entrant Hysteresis Loop and Multistable Ferrites. Nature 208, 67–68 (1965). https://doi.org/10.1038/208067a0
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DOI: https://doi.org/10.1038/208067a0
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