Glass composites based on magnetic semiconductor La<sub>0,67</sub>Sr<sub>0,33</sub>MnO<sub>3</sub> as functional materials
Abstract
Glass composites based on magnetic semiconductor La<sub>0,67</sub>Sr<sub>0,33</sub>MnO<sub>3</sub> as functional materials
Incoming article date: 30.11.2014Composites La0,67Sr0,33MnO3 (SiO2, Sb2O3) with different weight ratios have been synthesized. Their magnetoresistive and dielectric properties have been investigated. It has been established that in the frequency range from 10 to 106 Hz for SiO2 concentration of 10% the colossal magnitudes of the dielectric constant ( ~ 4 • 104) take place. The values of the negative isotropic magnetoresistance for samples with silica at room temperature is 8.6%, with abarriers of antimony oxide reaches 12%, which makes it possible to use such materials in spintronics.
Keywords: Magnetoresistance, colossal dielectric permittivity, glass composites, X-ray diffraction, spin polarization, barrier layers, tunneling, microstructure, dielectric spectrum, Maxwell-Wagner effect.