PROPIEDADES DE MAGNETO-TRANSPORTE EN SISTEMAS HÍBRIDOS DE CARBONO/Fe3O4

LISANDRO F. VENOSTA; PAULA G. BERCOFF; SILVIA E. JACOBO; M. VICTORIA BRACAMONTE

Córdoba

Congreso; Congreso Internacional de Metalurgia y Materiales SAM-CONAMET 2016; 2016

UTN

The synthesis of hybrid carbon-based materials with magnetic properties has become important due to theirapplicability in magnetic data storage, catalysis, water purification, capacitors and medical diagnosis andtherapy [1]. Likewise, these structures allow to analyze deeper physical aspects, testing models developed toexplain how the individual component´s magnetic and electrical properties are modified when they interactto form the compound. Among the various magnetic materials employed for the hybrid formation, magnetite(Fe 3 O 4 ) is well-suited due to its high saturation magnetization, interesting transport properties and low cost[2]. In this work, the behavior of resistivity versus temperature and magnetoresistance in carbon/Fe 3 O 4compounds is studied. In order to assess the effect of the interaction between both components, andcontribute to the understanding of these systems, we present a comparative study using commercial graphiteof different grain sizes and carbon nanotubes. The monitoring of the synthesis process and subsequentcharacterization of the systems were carried out using scanning electron microscopy and vibrating samplemagnetometry. The obtained results allow to assert that the synthesis is possible by the means of a simple co-precipitation process, obtaining materials with variable magneto-resistive properties according to the natureof the used graphite.