Abstract
The nanocomposite artificial crystals with embedded magnetic nanoparticles are obtained from opal matrices composed of the submicron SiO2 spheres. The introduced particles are sized from 5 to 60 nm. These artificial crystals contain particles of several rare earth titanates with pyrochlore structure. Low temperature magnetic properties of these nanocomposite materials have been investigated. The frequency and magnetic field dependences of AC magnetic susceptibility of nanocomposites with Gd2Ti2O7, Dy2Ti2O7, Sm2Ti2O7, Nd2Ti2O7 and Er2Ti2O7 particles have been measured in temperature range from 2 to 10 K at frequencies from 1 Hz to 10 kHz. It has been established that magnetic field dependences of these rare earth nanocomposite titanates obey Cole-Cole-like formula written for magnetic field dependency of AC magnetic susceptibility.
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