Properties of magnetite nanoparticles synthesized through a novel   chemical route
  We have developed a simple precipitation route to synthesize magnetite (Fe3O4) nano-particles with controlled size without any requirement of calcination step at high temperatures. The study of these nano-particles indicates an enhancement in saturation magnetization with reduction in size down to ~10 nm beyond which the magnetization reduces. The latter is attributed to surface effects becoming predominant as surface to core volume ratio increases. From the view -point of applications, 10 nm size of magnetite particles seems to be the optimum. 
Deepa Thapa, V. R. Palkar, M. B. Kurup and S. K. Malik (TIFR, Mumbai,   India)