Abstract
New composite materials containing polyaniline, sulfur, manganese acetylacetonate, lanthanum chloride, and praseodymium chloride are obtained. The components are blended and subjected to mechanochemical treatment in a ball mill; then, the composites are molded into thin films. Application of an external magnetic field with a strength of 6000 Oe leads to an increase in the conductivity of the films by more than 3000% to reach the properties of materials possessing giant magnetoresistance. An analysis of the time dependences of transient current under application of direct voltage to the samples indicates the presence of charge carriers of three types: presumably, e−, H+, and Cl−. A possible mechanism for the development of the giant magnetoresistance effect in the obtained composites is discussed.
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