Atomic Structure Imaging of Ferromagnetic Long-Range Ordered Alloy Nanoparticles

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  • 強磁性規則合金ナノ粒子の原子的構造
  • キョウジセイ キソク ゴウキン ナノ リュウシ ノ ゲンシテキ コウゾウ

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Abstract

<p>We have studied the atomic ordering and structures of hard magnetic L10–type FePd and CoPt alloy nanoparticles using aberration-corrected high-resolution transmission electron microscopy (HRTEM). The key issue throughout this study is the atomic ordering in the alloy nanoparticles; in view of excellent hard magnetic properties due to the high magnetocrystalline anisotropy energy, which is dependent on the long-range order parameter. The kinetics of atomic ordering plays a crucial role here, i.e., annealing below a reduced order-disorder transformation temperature is essential in obtaining the L10 ordered phase in small nanoparticles. Imaging using aberration-corrected HRTEM unambiguously revealed the atomic structures of the alloy nanoparticles 2−10 nm in diameter. The technique developed rapidly in the past ten years and is now practically available for the structural analysis in materials science.</p>

Journal

  • KENBIKYO

    KENBIKYO 47 (3), 167-171, 2012-09-30

    The Japanese Society of Microscopy

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