Magnetic nanoparticles have promising applications in spintronics, for example, to make single particle spintronic devices. The combination of widely accessible Fe and Si makes up a system of great interest and potential. Fe3 Si phase is considered to be similar with Heuslar alloy, which could lead to high spin polarization, a desirable feature for spintronic devices. Fe3 Si nanoparticles were fabricated by a unique gas condensation sputtering technique. Faceted Fe3 Si nanoparticles with D 03 crystal structure were obtained and exhibited ferromagnetic behavior at room temperature. The anisotropy constant K1 was estimated to be 8.0× 105 ergs/ cm3 by fitting the magnetization curve based on the law of approach to saturation.
Bibliographical noteFunding Information:
This work was partially supported by National Science Foundation Contract No. BME 0730825 and the Centre for Nanostructure Applications at University of Minnesota. Parts of this work were carried out in the Minnesota Characterization Facility, which receives partial support from NSF through the NNIN program.