Magnetic and Structural Characterization of IrO2 and Co:IrO2 Samples Synthesized via Pechini Method

• Published in: Journal of superconductivity and novel magnetism Vol. 26; no. 6; pp. 2319 - 2321
• Main Authors: Von Dreifus, D., de Oliveira, A. J. A., do Rosario, A. V., Pereira, E. C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Boston Springer US 01.06.2013; Springer
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Diffraction; Domain effects, magnetization curves, and hysteresis; Dopants; Exact sciences and technology; Magnetic Materials; Magnetic properties and materials; Magnetic semiconductors; Magnetism; Magnetization; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Original Paper; Oxides; Physics; Physics and Astronomy; Semiconductors; Strongly Correlated Systems; Studies of specific magnetic materials; Superconductivity; X-rays; Pechini method; Iridium dioxide; Cobalt doped iridium oxide; Rietveld method; Magnetization; Impurity density; Segregation; Doping; Paramagnetism; Magnetic field effects; XRD; Cobalt; Magnetic semiconductors; Iridium oxide; Ferromagnetism; Cobalt additions; Iridium; Spintronics
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-012-1424-5

Diluted Magnetic Oxide Semiconductors (DMOS) are oxides that combine two important properties for applications in spintronics: the capacity to control conductivity and ferromagnetism. Obtaining new materials that exhibit simultaneously these behaviors is challenging. In this paper, we investigate whether it is possible to use IrO 2 and Co:IrO 2 as a DMOS by studying their magnetic and structural characteristics. The samples were synthesized by the Pechini method, and characterized by X-ray diffraction and magnetization measurements. These samples were doped with 0 to 10 mol% Co concentrations. The X-ray diffraction was analyzed using the Rietveld refinement procedure which showed that all cobalt (Co 2+ ) introduced into the IrO 2 lattice replace Ir 4+ ions until the dopants concentration of about 10 mol%, and no phase segregation was observed for the highest dopant concentration investigated. Magnetization measurements as a function of temperature and applied magnetic field were performed on these samples. The results show a paramagnetic behavior, despite of the high Co concentration.