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Static magnetic birefringence (SMB) is used to investigate particle–particle interaction in iron-nitride-based MF samples. Particularly interesting are the SMB data at fields below 1 kG, where particle interaction plays a key role. The SMB data were curve fitted using the contribution of particle agglomerates plus the field dependence of the magnetic susceptibility associated with agglomerates. In addition to the peak susceptibility of the chainlike structures, the fitting procedure allows determination of the fraction of both isolated (8%) and chainlike (92%) particles. The mean particle diameter (12.3 nm) and the diameter dispersity (0.14) obtained from the transmission electron microscopy data are used to support the fitting of the SMB data. © 2003 American Institute of Physics.