Issue 2, 2009

Structural stability of icosahedral FePt nanoparticles

Abstract

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.

Graphical abstract: Structural stability of icosahedral FePt nanoparticles

Article information

Article type
Paper
Submitted
02 Jun 2009
Accepted
11 Aug 2009
First published
02 Sep 2009

Nanoscale, 2009,1, 276-279

Structural stability of icosahedral FePt nanoparticles

R. Wang, H. Zhang, M. Farle and C. Kisielowski, Nanoscale, 2009, 1, 276 DOI: 10.1039/B9NR00096H

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