Comparison of the two approaches for establishing macroscopic spins

As discussed above, there are two approaches for constructing macroscopic spins spin alignment within a molecule or among neighbouring molecules. Let us discuss briefly the pros and cons of the two approaches. 

Anyway, high-spin molecules of low dimensionality cannot become ferro-magnets by themselves. The additional stability at finite temperature should be derived from intermolecular interaction. Therefore the interplay of the two factors appears to be most desirable. 

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