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Orbital Magnetic Moments of CoO and FeO and Isotropic Co and Fe L 2,3 Absorption Spectroscopy

The relationship between the magnetic state of divalent Co and Fe ions in the octahedral crystal field and the isotropic L 2,3 X-ray absorption spectroscopy (XAS) spectrum is discussed with switching on and off the 3d spin-orbit interaction on the basis of an atomic multiplet calculation. The existence of orbital magnetic moment M o r b of ∼1µ B is shown to manifest especially in L 2 region as a narrow spectrum compared with that for M o r b = 0 for both ions. A deviation of L 3 : L 2 braching ratio from the statistical ratio 2 is also shown to be closely related with the existence of M o r b for both ions. In the light of our findings, the magnetic state of both ions in CoO and FeO is discussed. The role of isotropic core XAS as a means to determine M o r b in systems with no net magnetization is stressed.