Interdiffusion of Two L10Phases without Long-Range Order Decrease: Experiments and Molecular Dynamics Simulations

Christine Goyhenex; R.V.P. Montsouka; Mirosław Kozłowski; Veronique Pierron-Bohnes

doi:10.4028/www.scientific.net/SSP.129.59

Paper Titles

Comparison of the Strain Distribution Obtained from Multi Scale and Conventional Approaches to Modelling Extrusion
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Energetic Landscapes and Diffusion Properties in FeCu Alloys
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Multi-Lattice Kinetic Monte Carlo Simulation of Interface Controlled Solid-State Transformations
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Cluster Dynamics Modeling of Materials: Advantages and Limitations
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Interdiffusion of Two L1₀Phases without Long-Range Order Decrease: Experiments and Molecular Dynamics Simulations
p.59

Orientation of Interstitials in Clusters in α-Fe: A Comparison between Empirical Potentials
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Anisotropy of the Vacancy Migration in Ti, Zr and Hf Hexagonal Close-Packed Metals from First Principles
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Monte Carlo Simulation of Texture and Microstructure Transformation during Annealing of Steel
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A Phase Field Model for grain Growth and Thermal Grooving in Thin Films with Orientation Dependent Surface Energy
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HomeSolid State PhenomenaSolid State Phenomena Vol. 129Interdiffusion of Two L10Phases without Long-Range...

Interdiffusion of Two L1₀Phases without Long-Range Order Decrease: Experiments and Molecular Dynamics Simulations

Abstract:

The L10 ordered MPt(001) thin films (M = Fe or Co) are very interesting for perpendicular recording due to their magnetic anisotropy and magneto-optical behaviours. Epitaxial L10-ordered NiPt(001) / FePt(001) bi-layers were co-deposited on MgO(100) substrates by MBE. The L10 order parameter is high with the concentration modulation along the growth direction. Some FeNiPt2(001) thin films were obtained by interdiffusion of the bilayers. The long-range-order parameter is conserved after interdiffusion (S = 0.75 ± 0.06), which can be explained by different mechanisms: a second-neighbour jump, a six-jump cycle, an anti-structural bridge mechanism or an antisite-pair elimination and creation mechanism, a double vacancy or a triple defect diffusion mechanism. Quenched molecular dynamics calculations in the frame of the second moment approximation of the tight binding method have been performed to obtain the energetic paths of the different mechanisms. The secondneighbour vacancy jump, the simultaneous jumps of bivacancies and the triple defect mechanisms can be ruled out for energetic reasons.

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Solid State Phenomena (Volume 129)

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59-66

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https://doi.org/10.4028/www.scientific.net/SSP.129.59

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November 2007

Authors:

Christine Goyhenex, R.V.P. Montsouka, Mirosław Kozłowski, Veronique Pierron-Bohnes

Keywords:

Epitaxied Thin Films, FeNiPt₂, FePt, Interdiffusion, NiPt, Quenched -Molecular-Dynamics, X-Ray Diffraction (XRD)

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