513.001 Molecular and Solid State Physics

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Ferromagnetism

(a) In the theory of ferromagnetism, what is mean field theory? Discuss how the exchange energy is used in mean field theory.

(b) What is a Brillouin function?

(c) For a ferromagnet, plot the magnetization vs. temperature at zero applied magnetic field and at finite applied magnetic field.

(d) Plot the magnetic susceptibility vs. temperature.