Proximity effects, exchange bias and magnetic relaxation in γ-Fe₂O₃ nanoparticles.

ABSTRACT: Carbon-encapsulated γ-Fe₂O₃ nanoparticles (NPs) with emerging proximity effects were synthesized using a single-step solid-state pyrolysis at 750 °C. The morphology and size distribution of the NPs were investigated using high-resolution transmission and scanning electron microscopies revealing that the γ-Fe₂O₃ NPs, with an average diameter of 9 nm, are embedded in the amorphous porous carbon matrix. In addition, other trace phases (Fe₃C and metallic-Fe) were also detected through X-ray absorption spectroscopy and Mössbauer spectrometry. Moreover, the dynamics of the system was explored by means of AC susceptibility, magnetic memory and relaxation measurements, together with low-temperature exchange bias, suggesting the emergence of a

SUBMITTER: Gonzalez de la Vega M 

PROVIDER: S-EPMC12395275 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature