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Preparation of anisotropic magnetic FeNi Pt2 films on MgO(001): Atomistic mechanisms for the interdiffusion of two L 10 phases

Physical Review B - Condensed Matter and Materials Physics, ISSN: 1098-0121, Vol: 74, Issue: 14
2006
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Metrics Details

  • Citations
    12
    • Citation Indexes
      12
  • Captures
    12

Article Description

L 10 -ordered FeNi Pt2 (001) thin films were prepared by the interdiffusion of FePt(001) and NiPt(001) layers codeposited on MgO(001) substrates by molecular beam epitaxy (MBE). A large uniaxial magnetic anisotropy (Ku = 9.105 J/m3) and a reduced magnetic transition temperature (Tc =400 K) were obtained. Growth at 700 K and a first annealing at 800 K result in a large long-range order parameter reflecting the concentration modulation along the growth direction. This high long-range order parameter is conserved in the FeNi Pt2 layers after interdiffusion at 900 K, contrary to what is expected from a simple vacancy migration process. This experimental observation can be explained either by a 6-jump cycle mechanism or by the alternate diffusion of a double vacancy, which are both favored energetically over a second-nearest-neighbor jump mechanism or the simultaneous diffusion of a double vacancy as shown by quenched molecular dynamics simulations. © 2006 The American Physical Society.

Bibliographic Details

R. V. P. Montsouka; C. Goyhenex; G. Schmerber; C. Ulhaq-Bouillet; A. Derory; J. Faerber; J. Arabski; V. Pierron-Bohnes

American Physical Society (APS)

Materials Science; Physics and Astronomy

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