Charge-transfer-driven enhanced room-temperature ferromagnetism in BiFeO${}_3$/Ag nanocomposite

Abstract

We report observation of more than an order of magnitude jump in saturation magnetization in BiFeO${}_3$/Ag nanocomposite at room temperature compared to what is observed in bare BiFeO${}_3$ nanoparticles. Using transmission electron microscopy together with energy dispersive x-ray spectra (which maps the element concentration across the BiFeO${}_3$/Ag interface) and x-ray photoelectron spectroscopy, we show that both the observed specific self-assembly pattern of BiFeO${}_3$ and Ag nanoparticles and the charge transfer between Ag and O are responsible for such an enormous rise in room-temperature magnetization. The BiFeO${}_3$/Ag nanocomposites, therefore, could prove to be extremely useful for a variety of applications including biomedical.

11 pages, 7 figures, accepted for publication in Nanotechnology

References in corpus (4)

• Unexpected Magnetism of Small Silver Clusters
• Carbon p Electron Ferromagnetism in Silicon Carbide
• Large structure-dependent room temperature exchange bias in self-assembled BiFeO3 nanoparticles
• Nonmonotonic magnetic field dependence of remanent ferroelectric polarization in reduced-graphene-oxide-BiFeO${}_3$ nanocomposite