The nanotechnology is a new branch of science which is one of the most exciting in the world in last decades. The new materials with novel properties are discovered every day. Many scientists are working on the improving useful physical and chemical properties of the nanomaterials. The unique strength, capacitance, tribological and bio-compatibility are the driving force for the nanoscience. The tunable composition brings the tunable properties of the nanoobjects. The paper presents changes in the magnetic properties of the ferrite nanoparticles of the size around 15 nm by the changing the Me/Fe ratio in the magnetite based materials. The used materials as a substituents are Mn, Co, Ni.

It is shown that the substitution Me is present in the A and B positions depending on the kind of the metal and also depending on the concentration of the substitution elements. At low concentrations, Co and Ni atoms occupy B position while Mn are found in both, A- and B-sites. In all three cases a doublet shows up in the middle part of the spectra. Its intensity in the case of Co rather smoothly increases with increasing cobalt content. This is not the case of Ni and Mn for which non-monotonic variation is observed. In the case of the nominally 100% substitution by Ni pure superparamagnetic state is observed, while for Co and Mn some of the particles are still below blocking temperature.

Fig.1. Plot of the influence of amount of the substitution on the doublet intensity dependence

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