Pt surface segregation in L10-FePt nano-grains

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

doi:10.1016/j.scriptamat.2017.03.035

Pt surface segregation in L1₀-FePt nano-grains

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

Department of Chemistry

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13 Citations (SciVal)

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 language	English
Pages (from-to)	88-91
Number of pages	4
Journal	Scripta Materialia
Volume	135
Early online date	12 Apr 2017
DOIs	https://doi.org/10.1016/j.scriptamat.2017.03.035
Publication status	Published - 1 Jul 2017

Keywords

Atomistic simulation
FePt
Microstructure
Surface segregation

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10.1016/j.scriptamat.2017.03.035

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title = "Pt surface segregation in L10-FePt nano-grains",

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.",

keywords = "Atomistic simulation, FePt, Microstructure, Surface segregation",

author = "H. Sepehri-Amin and H. Iwama and G. Hrkac and Butler, {K. T.} and T. Shima and K. Hono",

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doi = "10.1016/j.scriptamat.2017.03.035",

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T1 - Pt surface segregation in L10-FePt nano-grains

AU - Sepehri-Amin, H.

AU - Iwama, H.

AU - Hrkac, G.

AU - Butler, K. T.

AU - Shima, T.

AU - Hono, K.

PY - 2017/7/1

Y1 - 2017/7/1

N2 - 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.

AB - 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.

KW - Atomistic simulation

KW - FePt

KW - Microstructure

KW - Surface segregation

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UR - https://doi.org/10.1016/j.scriptamat.2017.03.035

U2 - 10.1016/j.scriptamat.2017.03.035

DO - 10.1016/j.scriptamat.2017.03.035

M3 - Article

AN - SCOPUS:85017311725

SN - 1359-6462

VL - 135

SP - 88

EP - 91

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Pt surface segregation in L1₀-FePt nano-grains

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Keywords

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