We report on experiments showing that magnetism can be probed by means of the circular polarization of the fluorescence that is excited when charge carriers are injected into a magnetic surface with the tip of scanning tunneling microscope. We attribute this result to the interplay of the spin-orbit and the exchange interactions which gives rise to coupling between the electron-spin polarization of the valence bands of the ferromagnet and the photon spin.
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Parga et al. (1994) studied this question.
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