(a) Schematic spin alignment on Cr atoms for both FM and AFM states in ZZNR. Up arrow (red) represents spin majority and down arrow (blue) spin minority. (b) Energy difference Δ E AFM − FM ( = E AFM − E FM ) for ZZNR as a function of inverse ribbon width. (c) Maximal magnetic moment for Cr atoms in FM (red square) and AFM (blue triangle) states in ZZNR as a function of 1/W. (d) Spin charge density Δ ρ FM between spin majority and minority states for ZZNR-n_W (n_W = 6) and 2D CrI₃ with Δ ρ = 0.118 e/Bohr⁻³. (e) Electronic band structure and projected density of states (PDOS) for ZZNR-6. The Cr-3d and I-5p orbitals are shown in green and gray lines, respectively. (f) Band gap of both FM and AFM states as a function of 1/W. E g i (left panel) and E_g (right panel), as defined in the band structure in (e), represent intrinsic and spin-flip band gaps, respectively.