完全スピン偏極強磁性体CrAsの物質設計および合成

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タイトル別名
  • Materials design and synthesis of half-metallic CrAs.
  • カンゼン スピンヘンキョク キョウジセイタイ CrAs ノ ブッシツ セッケイ オヨビ ゴウセイ

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New half-metallic ferromagnets have been found in a zinc-blende crystal structure. The zinc-blende CrAs has been designed by ab initio calculations and the calculation predicts the highly spin-polarized electronic band structure. The zinc-blende CrAs thin film has been synthesized on GaAs (001) substrates by molecular-beam epitaxy. The film shows ferromagnetic behavior at room temperature and the magnetic moment per formula unit of CrAs is estimated to be about 3 μB, which agrees well with the theoretical prediction. The photoemission spectra of the CrAs film showed the Fermi edges indicating the metallic characteristics and the small band dispersion derived from Cr-3d bands.

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