Pt surface segregation in L10-FePt nano-grains. (1st July 2017)

• Record Type: Journal Article
• Authors: Sepehri-Amin, H.; Iwama, H.; Hrkac, G.; Butler, K.T.; Shima, T.; Hono, K.
• Is Part Of: Scripta materialia. Number 135(2017)
• Page Start: 88
• Page End: 91
• Publication Date: 2017-07-01
• Subjects: FePt -- Microstructure -- Surface segregation -- Atomistic simulation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.03.035
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: