Abstract
EXPERIMENTS carried out in recent years on nickel and iron have led to the view that the spontaneous magnetization does not disappear suddenly at the Curie point, but that there is a definite tail to the magnetization-temperature curve. The specific heat measurements of Ahrens1, and more particularly the work on very pure nickel by Grew2, establish beyond doubt that the energy (E) associated with the ferromagnetic state does not vanish suddenly at the Curie point, although there is probably a sharp discontinuity in the (d2E/dT2, T) curve at this temperature. The measurement of the energy, either through the specific heat or the magneto-caloric effect, appears to us to be the only sound method of estimating the degree of spontaneous magnetization.
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References
Ahrens, Ann. Phys., (5), 21, 169 (1934).
Grew, Proc. Roy. Soc., A, 145, 509 (1934).
Svensson, Ann. Phys., (5), 22, 97 (1935).
Mott, Proc. Roy. Soc., A, 153, 699 (1936); A, 158, 368 (1936).
Stoner, Phil. Trans., A, 235, 165 (1936).
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MOTT, N., POTTER, H. Sharpness of the Magnetic Curie Point. Nature 139, 411 (1937). https://doi.org/10.1038/139411a0
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DOI: https://doi.org/10.1038/139411a0
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