Material Design of Half-Metallic Zinc-Blende CrAs and the Synthesis by Molecular-Beam Epitaxy.

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  • Akinaga Hiro
    Joint Research Center for Atom Technology (JRCAT), National Institute for Advanced Interdisciplinary Research (NAIR),<BR> 1-1-4 Higashi, Tsukuba, Ibaraki 305-8562, Japan
  • Manago Takashi
    Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP),<BR> 1-1-4 Higashi, Tsukuba, Ibaraki 305-0046, Japan
  • Shirai Masafumi
    Division of Materials Physics, Department of Physical Science, Graduate School of Engineering Science, Osaka University,<BR> 1-3 Machikaneyama-cho, Toyonaka 560-8531, Japan

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A new class of half-metallic ferromagnets has been found in the zinc-blende crystal structure. The previously nonexistent zinc-blende CrAs thin films have been synthesized on GaAs (001) substrates by molecular-beam epitaxy, and show a ferromagnetic behavior at room temperature. The zinc-blende CrAs has been designed by ab initio calculations based on the local spin-density approximation, and the calculation predicts the highly spin-polarized electronic band structure.

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