Abstract
THE claim by McCurrie1 for a (BH)max value higher than previously recorded is manifestly incorrect, although the values he quotes from other publications are probably correct. For a permanent magnet material with remanence Br in gauss, the theoretically highest possible (BH)max value in gauss-oersteds is ¼Br2; this limit is on the basis of no change in the intrinsic magnetization between Br and the (BH)max point. In practice, some high coercivity materials approach this limit fairly closely, as illustrated by the test values of Walmer2 and Chaston3 which are quoted by McCurrie, but his own tests grossly exceed this limit, as shown in the Table 1.
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References
McCurrie, R. A., Nature, 216, 149 (1967).
Walmer, M. S., Engelhard Technical Bulletin (1961–1962).
Chaston, J. C., British patent, 849, 505 (1960).
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GOULD, J. Permanent Magnet Properties. Nature 216, 787 (1967). https://doi.org/10.1038/216787a0
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DOI: https://doi.org/10.1038/216787a0
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