(color online) Spin density distributions of double X-doped AlN nanosheets are shown in (a) Al₃₄Zn₂N₃₆ and (b) Al₃₄Cd₂N₃₆ FM state of configuration (0,2). The yellow and green isosurfaces correspond to the majority- and minority-spin densities. Pink, dark blue and red balls represent Al, N, and doping atoms, respectively.