# Ferromagnetism - computational physics

The autocorrelation of the magnetisation is plotted for the Ising model of a ferromagnet. The critical temperature is 2.3 J/k Is this the expected behaviour? as in, it decays super fast for temperatures lower than the critical, decays the slowest at the critical temperature, and then the decay time drops again at greater temperatures. IF so, why?

• You really should average your autocorrelation over more data to get good fits and no oscillations like in the second and third plot. It seems that instead of the autocorrelation (which averages over all times) you just took the correlation to your initial state. From the data in the first plot you wont get a significant fit result, as the autocorrelation goes to zero on timescales you can't resolve. – Paul G. Apr 10 '19 at 21:50
• We have a tagging system in the site to let users know what topic(s) the question covers, so please don't be lazy and use the exact same tags as your title question. Make your title actually descriptive of the question so users can get an idea as to what it's about before clicking on the link. – Kyle Kanos Apr 11 '19 at 13:06