Figure 7: Noncollinear magnetic configurations for Fe-Pt triangularly-shaped structures on Pt(111).
From: Complex magnetic structure of clusters and chains of Ni and Fe on Pt(111)

(a1) a triangle composed by 3 atoms of Fe in the vertices connected by Pt atoms. (a2) three atoms of Fe in the vertices of a triangle. (b1) and (b2) top and lateral views, respectively, of a Fe-Pt nanostructure where 15 Fe atoms form the lateral edges of a triangle, and its inside is decorated by 6 atoms of Pt.