![The free energy F as a function of M . a: The graph for an infinite ferromagnetic body with sponta- neous magnetization has a flat portion between ±M s below the Curie temperature (see Ref.[1]). b: For a fi- nite ferromagnetic body, the free energy has minima at ±M s . c: A theorem by Griffiths [4] implies that the free energy has a minimum at M = 0 at any temperature.](https://www.papersinphysics.org/public/journals/1/submission_982_1276_coverImage_en_US.png)
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Vol. 16 (2024)
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2024-09-18
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