Magneto and Piezo Resistivity in Anisotropic Magnetorheological Materials

MARIANO MANUEL RUIZ; JOSÉ LUIS MIETTA; GUILLERMO A. JORGE; P. SOLEDAD ANTONEL; GABRIELA LEYVA; ALEJANDRO BUTERA; OSCAR E. PEREZ; C JACQ

Buenos Aires

Congreso; At the Frontiers of Condensed Matter VI; 2012

Comisión Nacional de Energía Atómica. UNSaM. CONICET

Magneto and Piezo Resistivity in Anisotropic Magnetorheological Materials were Sinthesys and characterization of both magnetic and conductive particls. Composites were elaborated as following: dispersion of partices in organic matrix (PDMS and Etilcelulose + paraffins).Screen printing on alumina substrate with the fluid mixture was obtained. The total resistance of the composite is considered as two resistors in series: RT=Ri+RH. The first resistance Ri is an intrinsic inter-grain resistance which is an activated process present in any polycrystalline material (dependent on temperature but not on H). RH is an activated process (with an associated conductivity RH prop 1/SH) that accounts the effect of matching partially the spin polarizability of both grains by spin-alignment through the presence of H.Fe3O4@Ag-PDMS composites present magneto resistant properties.Magneto resistant studies of Fe2CoO4@Ag-PDMS composites are currently in progress.