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Rapidly quenched alloy of nominal composition Co 68 Nb 10 B 30 Cu 2 has been chosen as the parent material for nanocrystalline magnets exhibiting Curie temperature of the residual amorphous matrix much lower than room temperature. Characteristic feature of these magnets is that the created ferromagnetic crystals are embedded in the paramagnetic amorphous matrix for the measuring temperatures in their relatively very wide range between both Curie points of the residual amorphous matrix and the crystals. Crystallization and microstructural properties of a series of the nanocrystalline magnets produced at different temperature of annealing have been studied and the results obtained are shown. Similarly, basic magnetic properties of the nanocrystalline samples are also presented. The main conclusion drawn is that the magnets considered are suitable for the studies of magnetic properties of the crystals themselves and their mutual interaction through paramagnetic matrix, in particular.

A new preparation method of thin CdCr2Se4 : In films by vacuum evaporation technique is proposed. We report and analyse the temperature dependence of magnetization and the effect of Cr2+ and Cr+4 impurity ions on the FMR linewidth. Also the electrical transport properties of these films are studied.