Abstract
The $s\ensuremath{-}d$ mixing model, in which electron-photon coupling was taken into account, was employed to study the effect of optical irradiation on the moment of a magnetic impurity embedded in a nonmagnetic base. The local magnetic moment was calculated self-consistently by employing the Green-function technique. There exists notable photomagnetic effect, while the energy level configuration meets the resonant-absorption condition and the effective on-site energy of local electrons approaches the Fermi energy ${E}_{f}.$ The change of local moment primarily originates from the transition between a d-like local state and a p-like local (extended) state. The mechanism of photomagnetic effect of a magnetic impurity is that the optical irradiation breaks the original balance of electron distribution under Column interaction (Hubbard repulsion) via the change of local energy-level position and the decrease of its lifetime and hence results in the variation of local magnetic moment.
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