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The local magnetic and electronic structures of chromium substituted iron oxide polycrystalline samples are investigated via Fe L-edge x-ray absorption near-edge structural and magnetic circular dichroism measurements.A strong dependence of atomic magnetic levels on the applied exteal magnetic field is observed.The magnetic behavior of Cr-doped iron oxides are determined to be dominantly goveed by the d-d hybridization between Fe and Cr valence levels.In addition,the formation of CrO2 and Cr2O3 chromium oxide clusters in the sample are observed to determine the magnetic ordering,i.e.anti-ferromagnetic or ferromagnetic with the changing exteal magnetic fields.The results highly agree with the previous studies.