I have a system which I have measured In the zero field cooled and field cooled cooled arrangements. The system is an activated carbon with metal nanoparticles dispersed in/on the material. The two measurements bifurcate at low temperatures, suggesting spin-glass or superparamagnetism. The field cool cooled measurements suggest Curie-Weiss-like behaviour and I would like to determine the Curie Constant and Weiss Temperature. However, my system is likely to have a to have temperature independent contributions which if unaccounted for will make the fitting values meaningless.
My questions are:
1) how can I account determine a value for the temperature independent contributions to accurately fit the reciprocal magnetic susceptibility to determine the Curie Constant and Weiss Temperature?
2) Is the Curie-Weiss equation valid for a spin-glass/superparamagnetic system?
Dear Stefan,
Thank you for the recommendation. I have read this article previously. While it mentions you should be wary of temperature-independent contributions, it doesn't discuss how to account for them in the fitting procedure (unless I missed something).
Regards
Charlie
Thank you, Stefan!
I have made a few functions today. One is eq. (9) from the paper you suggested. The second plot [χ-χ0], where χ0 has been determined from χ(T=inf) on a 1/T plot.
The values I am getting still seem slightly unreasonable. But this may suggest Curie-Weiss isn't appropriate for my sample.
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