Magnesium ferrite thin films: role of interface film/substrate on structural, magnetic and electric properties

G. BRIDOUX; P. ESQUINAZI; S.P. HELUANI; C. E. RODRÍGUEZ TORRES; K. L. SALCEDO RODRÍGUEZ; GUSTAVO A. PASQUEVICH

Buenos Aires

Conferencia; Multifunctional oxides: sinergy between fundamental science and novel technologies; 2017

INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA -INN-CNEA-, Departamento de Materia Condensada -GiyA-

Mg ferrite (MgFe2O4) thin fillms were grown by a Fe-O/Mg-O multilayer process using DC magnetron sputtering on MgO (100) and SrTiO3 (100) substrates. The samples show high values of saturation magnetization and Curie temperatures above room temperature. While in the case of the sample grown on MgO the hysteresis loops indicate the existence of more than one ferrimagnetic component and lower value of remanence to saturation ratio, the deposited one on SrTiO3 is mono-component and has a rectangular-shape magnetic loop at all temperatures below 300 K. The difference is attributed to different microstructures due to the misfit strain caused by the different lattice constants between substrates and ferrite. The electric transport and photoconductivity properties have been investigated on both samples indicating the important role of the substrate in the generation of photo carriers and on the final properties of the MgFe2O4 thin films.