Pt surface segregation in L10-FePt nano-grains

H. Sepehri-Amin, H. Iwama, G. Hrkac, K. T. Butler, T. Shima, K. Hono

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Abstract

The influence of the chemical compositions of FePt films on the surface segregations of Pt was investigated by cross-sectional high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) of L10-FePt granular films grown on single crystalline MgO substrates. Ab initio atomistic simulations revealed the surface segregation of Pt is detremental for the magentocrystalline anisotropy energy of the L10-FePt grains. This detremental effect is pronounced for the grain size of less than 15 nm. We found that the Pt surface segregation can be suppressed by a trace addition of Ag to the FePt film.

Original languageEnglish
Pages (from-to)88-91
Number of pages4
JournalScripta Materialia
Volume135
Early online date12 Apr 2017
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • Atomistic simulation
  • FePt
  • Microstructure
  • Surface segregation

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    Sepehri-Amin, H., Iwama, H., Hrkac, G., Butler, K. T., Shima, T., & Hono, K. (2017). Pt surface segregation in L10-FePt nano-grains. Scripta Materialia, 135, 88-91. https://doi.org/10.1016/j.scriptamat.2017.03.035