EPR detection of presumable quantum behavior of iron oxide nanoparticles in dendrimeric nanocomposite

Magnetic properties of γ-Fe2O3 nanoparticles can be analyzed using the large spin value S=30. [Display omitted] •Magnetic properties of γ-Fe2O3 nanoparticles can be analyzed using the large spin value S=30.•γ-Fe2O3 nanoparticles can be considered as a quantum object.•Superparamagnetic nanoparticles have been studied by Electron Magnetic Resonance. The superparamagnetic γ-Fe2O3 nanoparticles (average diameter of 2.5nm) encapsulated in poly(propylene imine) dendrimer have been investigated by Electron Magnetic Resonance (EMR). EMR measurements have been recorded in perpendicular and parallel configurations in the wide temperature range (4.2–300K). It has been shown that the model based on the spin value S=30, corresponding to the total magnetic moment of the nanoparticle, can be used to interpret the experimental results and the proof of the quantum behavior of γ-Fe2O3 nanoparticles.