Magnetic and Microwave Properties of 3-D Nanocomposites With Transition Metal and Palladium Particles

Abstract

The microwave properties of magnetic 3-D nanocomposites, based on opal matrices, modified by the introduction of 3-D transition and palladium metal particles inside the intersphere voids, have been studied. The presence of palladium in the nanocomposites under study leads to a number of distinct features. The frequency dependence of transmission and reflection coefficients at room temperature, in the frequency range of 26–38 GHz, was measured, and magnetic resonance and antiresonance have been studied for several opal-based nanocomposites, containing Fe, Ni, and Pd. The magnitude of the magnetic resonance peak height is less for the nanocomposites containing Pd particles than that of the nanocomposites with transition metals without Pd. For the nanocomposites with only one metal, Ni or Fe, the antiresonance is also observed. Due to the large variations of the microwave transmission and reflection coefficients, this class of nanocomposite materials seems to be applicable in magnetic field driven devices in the millimeter wavelength band.