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A new peer reviewed journal publishing experimental and theoretical work across the breadth of nanoscience and nanotechnology
Paper
Nanoscale, 2009, 1, 276 - 279, DOI: 10.1039/b9nr00096h
Structural stability of icosahedral FePt nanoparticles
Rongming Wang, Hongzhou Zhang, Michael Farle and Christian Kisielowski
The structural stability of FePt nanoparticles of about 5–6 nm diameter was investigated by dynamic high resolution transmission electron microscopy. The FePt icosahedra were very stable under an electron beam flux of
20 A/cm2 at 300 kV. Surface sputtering was suppressed due to the large sputtering threshold energy of a Pt-rich shell. Under a flux of 50 A/cm2, the trapping potential well of the FePt particle on the supporting carbon film was lowered by the magnetic interaction between the electron beam and the particle, which leads to rotational and translational motions of the particle. A large dose of electrons (200 A/cm2) initiated melting and recrystallization of the FePt particle. The structure of the FePt nanoparticle, a Pt enriched shell around an Fe/Pt magnetic core, is believed to be responsible for its dynamic behaviour under different beam conditions.
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