Abstract
ALLOYS of platinum–cobalt near the equiatomic composition can, by suitable heat treatment, undergo a disorder to order phase transformation which produces extreme magnetic hardness. Coercivities up to 6,800 oersteds have been observed at room temperature. Walmer1 has recently given a comparative table of magnetic properties since the discovery of the alloys in 1936 by Jellinghaus2, in which the coercivities obtainable have risen from 4,000 to 4,300 oersteds (1961) and the energy product (BH)max from 4.6 × 106 to 9.5 × 106 gauss-oersteds. Walmer also includes a polar diagram which shows how the coercivity varies with crystallographic direction. A maximum of 6,800 is observed in 〈111〉 and 4,300 oersteds in 〈100〉. Table 2 of Walmer's article lists the optimum magnetic properties as follows: 
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References
Walmer, M. S., Engelhand Technical Bulletin (1961–1962).
Jellinghaus, W. Z., Tech. Phys., 17, 33 (1936).
Chaston, J. C., British Patent, 849, 505 (1960).
Brissoneau, P., Blanchard, A., and Bartholin, H., I.E.E.E., Trans. on Magn. Mag., 2, 479 (1966).
McCurrie, R. A., and Gaunt, P., Phil. Mag., 13, 567 (1966).
Gaunt, P., Phil. Mag., 13, 579 (1966).
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MCCURRIE, R. Permanent Magnet Properties of Platinum–Cobalt Alloys. Nature 216, 149 (1967). https://doi.org/10.1038/216149a0
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DOI: https://doi.org/10.1038/216149a0
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