Local chemical distribution and electronic structure of Ge1−T DMS single crystals (T=Cr, Mn, Fe)

Abstract The spatial concentration distribution and local electronic structure of ferromagnetic Ge 1− x T x (T=Cr, Mn, Fe) DMS single crystals have been investigated by using scanning photoelectron microscopy (SPEM), X-ray absorption spectroscopy (XAS), and photoemission spectroscopy (PES). It is found that doped T ions in Ge 1− x T x crystals are chemically phase-separated, suggesting that the observed ferromagnetism arises from the phase-separated T-rich phases in Ge 1− x T x .