Density dependence of zinc-blende MnAs dots studied by X-ray absorption spectroscopy and X-ray magnetic circular dichroism

  • Okabayashi J
  • Mizuguchi M
  • Ono K
 et al. 
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Abstract

Zinc-blende type nanoscale MnAs dots were grown on a sulfur-passivated GaAs (001) surface by molecular beam epitaxy. We report on the dot density dependence of the X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) in the Mn 2p core-level region. The XAS spectrum of low-density MnAs dots showed "localized" behavior as in the case of (Ga,Mn)As, while the spectrum of high-density MnAs dots changed to metallic behavior. The magnetic-field dependence of the XMCD revealed ferromagnetic behavior in the case of high-density MnAs dots. © 2003 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • X-ray absorption spectroscopy
  • X-ray magnetic circular dichroism
  • Zinc-blende MnAs dots

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