Abstract
EXPERIMENTS on the temperature coefficients of magnets published some years ago (Roy. Soc. Phil. Trans., vol. cciii., 1903) showed that the magnitude of the coefficient is largely dependent on the dimension ratio of the magnet, but that when the dimension ratio is sufficiently increased to make the self-demagnetising factor negligible, the coefficient is then characteristic of the ferromagnetic material. Observations made at that time, but not published, on iron, nickel, and cobalt magnets heated up to 100° C. showed that the coefficient was large in nickel, less in iron, and least in cobalt, the order being the inverse of the order of the magnetic critical temperatures of these metals.
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ASHWORTH, J. The Temperature Coefficients of the Ferromagnetic Metals. Nature 84, 238 (1910). https://doi.org/10.1038/084238d0
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DOI: https://doi.org/10.1038/084238d0
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