A comparison of the spin polarized unoccupied electronic structure of [Fe$^{II}$(TCNE$^{-})$(NCMe)$_{2}$]$^{+}$[Fe$^{III}$Cl$_{4}$]$^{- }$determined by XMCD vs. UV-Vis MCD

A direct comparison between XMCD and UV-Vis MCD of the energy resolution and spin polarization of the unoccupied electronic structure of [Fe$^{II}$(TCNE$^{-})$(NCMe)$_{2}$]$^{+}$[Fe$^{III}$Cl$_{4}$]$^{-}_{ }$will be presented. Our studies suggest that the enhanced m$_{j}$ selectivity in UV-Vis MCD, from partially occupied initial states, leads to a greater energy resolution of the unoccupied electronic structure of Fe[TCNE] vs. that allowed by XMCD and may be true for magnetic solids in general. Further, we will show evidence of the spin polarization of the lowest unoccupied state for the Fe[TCNE] organic-based magnet in the context of it's applied use in magnetoelectronics.