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X-ray absorption spectroscopy was used to determine the valence state inLa$_2$Co$_{1-x}$Mn$_{1+x}$O$_6$ ($x\approx 0.23$) thin films. We found that inspite of the non-stoichiometry, Co is in a divalent state while Mn ions show amixed valence state. The relation of this finding with the magnetic propertiesof the films is discussed. X-ray magnetic circular dichroism measurements provethat magnetic anisotropy originates from Co spin-orbit coupling and it isstrain-dependent: a strong increase of the angular contribution to the magneticmoment is found when in-plane (out-of-plane) and cell parameters get expanded(compressed). This behavior is reproduced by first order perturbation theorycalculations.

physical review. b./physical review. b

Magnetic anisotropy and valence states in  La$_2$Co$_{1-x}$Mn$_{1+x}$O$_6$ ($x\approx 0.23$) thin films studied by X-ray  absorption spectroscopy techniques