Abstract
In the present work, a brief description of the nonlinear magnetic susceptibility is given together with selected results outlining the relevance of this technique in the analysis of complex magnetic structures. In particular, details are provided concerning the ferromagnetic transition as observed through the third order magnetic susceptibility in two intermetallic compounds: Y 2Fe 17 and Gd 5Si 2.1Ge 1.9. Moreover, results concerning the nonlinear behavior of a rutheno-cuprate compound, namely RuSr 2GdCu 2O 8, are also reported with a discussion outlining the coexistence in this compound of ferromagnetic clusters exhibiting superparamagnetic behavior dispersed in an antiferromagnetic matrix.
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