1. In 1907, Pierre Weiss published measurements of the magnetization of magnetit
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Question
1. In 1907, Pierre Weiss published measurements of the magnetization of magnetite (Fe3O4) as a function of temperature. His values, with magnetization expressed as a fraction of the magnetization at absolute zero and temperature expressed as a fraction of the Curie temperature, are as follows: /o 0.92 0.88 0.83 0.77 0.68 0.58 0.43 0.32 0.22 0.03 T/Tc 0.23 0.33 0.43 0.54 0.55 0.78 0.69 0.94 0.95 0.98 Plot these values together with the curve derived from the Weiss–Langevin theory of ferromagnetism, which is the curve labeled J= in Fig. 4.7. In 1907, ferrimagnetism was unknown, and magnetite was regarded as a ferromagnet. The agreement between theory and experiment shown by these two curves was strong evidence for the validity of the theory. But the agreement was just a coincidence; the ferrimagnetic structure of magnetite means the theory cannot apply.
Explanation / Answer
Magnetization of magnetite (Fe3O4) as a function of temperature is an increasing parabolic curve which become constant after a particular saturation temperature .
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