Magnetic Resonance in Ni-Zn-Fe Spinel Doped Opal Matrix

In this work the microwave properties are studied of 3D-nanocomposites obtained by insertion of nanoclusters of (Ni-Zn) ferrite in the opal matrix with diameter of the nano-spheres 270 nm. The measurements are carried out using two methods, the first with the sample placed in the cross section of the rectangular waveguide and the second with a sample in the cavity. It is shown that there is effective interaction of electromagnetic field with the sample. Magnetic field dependence of the transmission coefficient is resonant in shape. Several branches of the magnetic resonance have been observed including the acoustic branch. It has been found that the transmission coefficient module can vary up to 70% under the action of magnetic field. Such great variations could be applicable for the magnetic field driven electronic devices of the millimeter wavelength band.