Spatial Chemical Inhomogeneity and Local Electronic Structure of Mn-Doped Ge Ferromagnetic Semiconductors Academic Article uri icon

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abstract

  • We have investigated the chemical distributions and the local electronic structure of potential diluted magnetic semiconductor Ge0.94Mn0.06 single crystals using scanning photoelectron microscopy (SPEM), x-ray absorption spectroscopy (XAS), and photoemission spectroscopy (PES). The SPEM image shows the stripe-shaped microstructures, which arise from the chemical phase separation between the Mn-rich and Mn-depleted phases. The Mn 2p XAS shows that the Mn ions in the Mn-rich region are in the divalent high-spin Mn2+ states but that they do not form metallic Mn clusters. The Mn 3d PES spectrum exhibits a peak centered at approximately 4 eV below E(F) and the negligible spectral weight near E(F). This study suggests that the observed ferromagnetism in Ge1-xMnx arises from the phase-separated Mn-rich phase.

authors

  • Kang, J-S
  • Kim, G
  • Wi, SC
  • Lee, Sung-sik
  • Choi, S
  • Cho, Sunglae
  • Han, SW
  • Kim, KH
  • Song, HJ
  • Shin, HJ
  • Sekiyama, A
  • Kasai, S
  • Suga, S
  • Min, BI

publication date

  • April 15, 2005