2018-10-222018-10-222012-12LEITE, E.S. et al. Use of magnetic resonance to investigate magnetic fluids for transformers application. Revista Mexicana de Física, Coyoacán, v. 58, n. 2, p. 249-252, Dec. 2012.0035-001Xhttp://repositorio.bc.ufg.br/handle/ri/16228Magnetic resonance (MR) was used to investigate two magnetic fluid (MF) samples containing nanosized (average 3 nm in diameter) iron oxide particles suspended in insulating mineral and vegetal oils. The MR spectra were analyzed using two Lorentzian-like components. Analysis of the temperature (T) dependence of the resonance field (HR) indicates that the lower-field (higher-field) resonance line accounts for monomers (chain-like units). The solid-liquid phase transition of the MF samples, taking place around the melting point of the insulating oil (solvent), is indicated by a cusp in the HR £ T curve, which is more pronounced for the lower-field resonance line component. This finding was associated to a higher reorientation of the monomer’s magnetic moment upon melting of the MF sample.engAcesso AbertoTransformerMagnetic fluidMagnetic resonanceNanoparticleTrasformadorFluido magnéticoResonancia magnéticaNanopartículasArtigo