Observation of interaction fields in the assembly of single domain particles

A simple method is proposed for the observation of interaction in the assembly of single domain particles based on registration of anhysteretic remanent magnetization. In contrast to established methods relied on isothermal magnetization, the proposed method is more sensitive to the weak interaction and helps to find the distribution of the particles in the interaction fields. The method is very simple: a differentiating of a single experimental curve is enough to obtain the distribution. Verification of the method was performed on the samples of different origins and proved a good correlation of experimental results and numerical estimations.