Abstract
Magnetic-circular-dichroism (MCD) spectra have been obtained at and around the ${\mathit{M}}_{2,3}$ core absorption edges in single crystals of ferromagnetic Ni and ferrimagnetic ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$. Furthermore, strong MCD signals were observed for the weak multiplet structures of ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ in the prethreshold region. The experiments were performed using a bulk-sensitive reflection method by utilizing directly characterized, circularly polarized synchrotron radiation in conjunction with an ultrahigh-vacuum-compatible, i.e., bakable, superconducting magnet of interesting design. The present observation of a strong MCD not only provides a sensitive method for probing the local magnetic states of magnetic substances, but also could provide valuable information concerning the 3d electronic states of these materials.
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