Abstract
The electronic and spin states of the perpendicular magnetization films of Tb17 Feχ Co (83-χ_) (χ=0, 9.5, 32.5, 61.4 and 74.5) were measured by means of soft Χ-ray absorption and magnetic circular dichroism spectroscopy for Tb element to investigate the magnetic anisotropy. The origin of the magnetic anisotropy is said to be caused by a large orbital moment of the well-localized 4ƒ electron. The expectation values of orbital moment for the different composition of Fe were estimated to be about 1.2 μB applying a sum rule for the spectra. Using a theoretical model calculation the opening angle of the conical distribution of Tb moment along the easy axis of magnetization was estimated to be about 67 degree.
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