Figure 2From: First-Principles Study of Magnetic Properties of 3d Transition Metals Doped in ZnO NanowiresThe calculated relative defect formation energies ΔHf(α,0) of the neutral transition metal impurities in ZnO nanowires of different diameters and bulk case. (All the formation energies take reference to the formation energy of Cr doped in the bulk ZnO)Back to article page