RODRIGUES, PRISCILA S.MATOS, IZABELA T.SALES, TATIANE S.BURIMOVA, ANASTASIACABRERA-PASCA, GABRIELPEREIRA, LUCIANO F.SAXENA, RAJENDRA N.OTUBO, LARISSACARBONARI, ARTUR W.2022-05-092022-05-09RODRIGUES, PRISCILA S.; MATOS, IZABELA T.; SALES, TATIANE S.; BURIMOVA, ANASTASIA; CABRERA-PASCA, GABRIEL; PEREIRA, LUCIANO F.; SAXENA, RAJENDRA N.; OTUBO, LARISSA; CARBONARI, ARTUR W. Annealing effect on the structural and local magnetic properties of nickel ferrite nanoparticles studied by hyperfine interaction measurements. In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th, November 2-6, 2020, Online. <b>Abstract...</b> DisponÃvel em: http://repositorio.ipen.br/handle/123456789/33053.http://repositorio.ipen.br/handle/123456789/33053Nickel ferrite in the form of nanoparticles is a technologically important material that can be applied for the production of biosensors, catalysts, drug delivery, and magnetic resonance contrast agents. In this work NiFe O samples comprising spherical nanoparticles of ~6 nm in diameter have been synthesized via a thermal decomposition route. The quality control of the samples was carried out with conventional techniques including X-ray diffraction and transmission electron microscopy. Post-synthesis XRD pattern revealed textured spinel NiFe O . Local magnetic properties were examined with Time Differential Perturbed Angular Correlation (TDPAC) spectroscopy within the 12 - 773K temperature range with In( Cd) probe introduced into the samples at synthesis. Quasi-static magnetic properties were observed (including above room temperature), as expected due to the small time window of TDPAC. The TDPAC results shown in Fig. 1 were analyzed using a model with combined electric quadrupole and magnetic dipole interactions. An expressive dynamic interaction was observed upon heating after synthesis. A theoretical model based on the Brillouin function for different ionic moments was applied to study the evolution of the hyperfine magnetic field with temperature (see Fig. 1-2) and allowed to attribute the magnetic interaction to the probe location at Fe3+ site. Site occupancy and the interplay between magnetic and structural properties are discussed with respect to application perspectives.openAccessAnnealing effect on the structural and local magnetic properties of nickel ferrite nanoparticles studied by hyperfine interaction measurementsResumo de eventos cientÃficos0000-0002-4499-59490000-0003-3023-1718https://orcid.org/0000-0002-6078-229Xhttps://orcid.org/0000-0002-4499-5949