Synthesis and assembly of barium-doped iron oxide nanoparticles and nanomagnets†
Abstract
A facile organic-phase synthesis of monodisperse barium-doped iron oxide (Ba–Fe–O) nanoparticles (NPs) is reported. The Ba–Fe–O NPs can be converted into hexagonal barium ferrite NPs at 700 °C, showing strong ferromagnetic properties with Hc reaching 5260 Oe and Ms at 54 emu g−1. Moreover, the Ba–Fe–O NPs can be assembled into densely packed magnetic arrays, providing a unique model system for studying nanomagnetism and for nanomagnetic applications.