usually one calculates from their SQUID magnetometry MvT data
Ueff = 2.828*SQRT(Xp*T)
Where Ueff is the effective magnetic moment, Xp is the corrected paramagnetic susceptibility, and T is temperature
However do we need account for the Weiss constant also to get the correct result when considering ferro/antiferromagnetic materials?
so
Ueff = 2.828*SQRT(Xp*(T-weiss constant)
Yes, you would have to take it into account!
I usually go by the inverse susceptibility. It should be proportional to the temperature (which is easily checked) and you can get the (squared) effective moment from the slope. In such a plot the paramagnetic Curie-Weiss temperature corresponds just to a horizontal displacement of the curve and not a fit parameter since that does not affect the slope. Nevertheless you can read it off directly from the intersect of the straight with the temperature axis!.
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