Effect of particle size on magnetic and electric transport properties of La0.67Sr0.33MnO3 coatings

摘要: A systematic study of polycrystalline La0.67Sr0.33MnO3 (LSMO) manganite coatings has been undertaken to analyse the effect various particle sizes on magnetic and electric transport properties. In order acquire a series samples with different sizes, were prepared by sol–gel method subjected annealing at four temperatures. With decreasing magnetization decreases while coercivity increases, which is attributed magnetically disordered surface layer. More attractively, electrical properties can be systematically manipulated so low field magnetoresistance (LFMR) values. Emphasis placed how size affects temperature dependence resistivity, three conduction models are explored describe behaviours in regions. minimum resistivity observed region presence absence field, mainly explained as due intergranular spin polarized tunneling (ISPT) through grain boundaries (GBs) materials.