Masafumi Nakaya1,2, Yuko Tsuchiya3, Kenchi Ito4,3, Yasunori Oumi2, Tsuneji Sano2, Toshiharu Teranishi2
1Division of Process and System Engineering
2School of Materials Science, Japan Advanced Institute of Science and Technology
3Central Research Laboratory, Hitachi,Ltd.
4Center for Innovative Integrated Electronic Systems (CIES)
Tóm tắt
Abstract
The novel synthesis of FePt nanoparticle superlattices by polyol reduction of platinum acetylacetonate and iron acetylacetonate is reported. The compositions of FePt nanoparticle are readily controlled, and the particle sizes are not significantly affected by the compositions, retaining to be ca. 3 nm with a very narrow size distribution. The FePt nanoparticles self-assemble into 2-D and 3-D superlattices. Thermal annealing converts the crystal structure of FePt nanoparticle from fcc to L10 phase and transforms the superparamagnetic nanoparticle into ferromagnetic one.
