Figure 6: The propagator between d states in Eq. (1): Real (full lines) and Imaginary (dashed lines) part of the Green's functions,
, for electrons with spin σ = ↑(black lines), and σ = ↓(red lines) for (a) an Fe pair linked by 5 Pt atoms on Pt(111), and (b) a monoatomic Fe chain with 7 atoms adsorbed on Pt(111).
From: Complex magnetic structure of clusters and chains of Ni and Fe on Pt(111)

The inset shows the geometry of the calculation, where grey balls represent Pt atoms and orange balls represent Fe atoms.
, for electrons with spin σ = ↑(black lines), and σ = ↓(red lines) for (a) an Fe pair linked by 5 Pt atoms on Pt(111), and (b) a monoatomic Fe chain with 7 atoms adsorbed on Pt(111).