Hi,(adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Non-linear regression of Curie's Law

**Physics Forums | Science Articles, Homework Help, Discussion**