Analysis of the surface energetics suggests that the absolute value of the total spin can ) which also has no spin. In the next case, going from NMA to NMF, the Al is replaced with Fe 3+ (d 5 ), high spin. This causes the absolute total spin of the entire system to increase by 1.5. With this increase in spin, we also observe the ∆G 1 for Ni decrease by 0.92 eV. As we increase the absolute spin through compositional tuning, we expect the stability of the A transition metal within the lattice to decrease, allowing for easier removal/dissolution. We also observe this trend for compositions where the A metal is Fe and V. We find an exception when the A-site metal is Fe, shown in Table with FTA, the only CMO with no spin on any of the metals, where it has a lower absolute total spin than FMA, but a higher ∆G 1 . We also compared the average spins for each metal for the bulk, surface and vaccancy structures shown in section S2 in the SI.