Structural stability of icosahedral FePt nanoparticles

Nanoscale
Rongming WangChristian Kisielowski

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 approximately 20 A/cm(2) at 300 kV. Surface sputtering was suppressed due to the large sputtering threshold energy of a Pt-rich shell. Under a flux of approximately 50 A/cm(2), 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 (approximately 200 A/cm(2)) 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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Citations

Jan 15, 2014·Chemical Communications : Chem Comm·Jialong LiuRongming Wang
Mar 12, 2015·Physical Chemistry Chemical Physics : PCCP·Paweł T JochymPrzemysław Piekarz
Feb 19, 2019·Physical Chemistry Chemical Physics : PCCP·Lei DengWangyu Hu
Jan 23, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·L D Marks, L Peng
Jun 5, 2013·Chemical Communications : Chem Comm·David A J HermanRichard D Tilley
May 20, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhenyu LiuGuofeng Wang
Dec 5, 2020·Accounts of Chemical Research·Zhiheng LyuYounan Xia

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