Magnetic Anisotropy: Factors & Fe3+ vs Mn3+ in Octahedral

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The magnetic anisotropy of a single ion depends upon what factors? How we can compare the magnetic anisotropy of Fe3+ and Mn3+ in octahedral geometry?
 
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In general it depends on the orbital momentum. For 3d transitions metals there is no unique answer as for a given number of 3d electrons there are several possible spin states, depending on the strength of magnetic interactions and crystal field splitting.

http://en.wikipedia.org/wiki/Spin_states_(d_electrons)
 

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