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Amorphous rare-earth-transition-metal thin films have been deposited in ultrahigh vacuum by ion beam sputtering. Film composition and purity are controlled by Auger electron spectroscopy and X-ray photoemission spectroscopy. X-ray and ultraviolet photoemission valence band spectra are compared with polar magnetooptical Kerr-effect spectra in the photon energy range 0.5>
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Weller et al. (1988) studied this question.
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