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I've collected some data on the relative permeability of ferrite at various temperatures, subject to a constant external magnetic field and I'd like to fit a curve to the data.

I believe that stat-mech theory predicts that [itex]\mu_r = 1 + a\tanh(b/T)[/itex] where [itex]T[/itex] is thermodynamic temperature. The constant [itex]a[/itex] is clearly [itex]\max \mu_r -1[/itex], but I can't figure out what condition I should use to estimate [itex]b[/itex]?

Any help would be greatly appreciated.

James

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# Non-linear regression of Curie's Law

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