ИСТИНА

The continuous interest in recent years in magnetic nanocomposites of the “ferromagnetic metal-dielectric” type is associated both with the variety of their properties that are promising for practical applications, and with the fact that they can be considered as a convenient platform for studying the properties of disordered systems and interactions in a system of magnetic nanoparticles [1-5]. Depending on the volume fraction of magnetic nanoparticles embedded in dielectric matrix, their size and shape nanocomposites can be in superparamagnetic, superspin-glass, superferromagnetic and ferromagnetic states or a mixture of them. Recently, it has been understood that the metal-insulator transition does not occur at the same concentration as the infinite cluster of direct сontact granules is formed. The later concentration is called as the percolation threshold xper, but it does not coincide with the critical concentration for the metal-insulator transition xMI and also with concentration xFM of long-range ferromagnetic order appearance. I present recent results on structural, magnetic, magnetotransport, magnetooptical properties of magnetic nanocomposites focusing on peculiarities of electrical resistivity, anomalous Hall effect, magnetoresistance, transverse Kerr effect for compositions close to the percolation threshold.