Microscopic Characterization of the L10-FePt Nanoparticles Synthesized   by the SiO2-Nanoreactor Method
  We investigated magnetic properties of the L10-FePt nanoparticles synthesized by the SiO2-nanoreactor method by means of Moessbauer spectroscopy from the microscopic point of view. Almost all of the nanoparticles were revealed to have nearly the same Moessbauer hyperfine parameters as those of the bulk L10-FePt alloy, indicating that they have well-defined L10 structure equivalent to the bulk state in spite of their small size of 6.5 nm. 
Yoshinori Tamada, Yasumasa Morimoto, Shinpei Yamamoto, Naoaki Hayashi,   Mikio Takano, Saburou Nasu and Teruo Ono