Abstract
Magneto-optic Kerr effect of amorphous (a-)GdFe films has been investigated by separating each magneto-optic contribution of Gd and Fe. Amorphous GdCu and YFe alloy films which consist of a single magnetic element have been prepared and their magnetization and polar Kerr rotation in the wavelength range of 400-700 nm have been measured at liq. N2 temperature. From the Kerr spectra of a-GdCu and a-YFe and their magnetization, the constant K(λ) defined by θK=K(λ), M(T) has been estimated. Using the K(λ) values we have separated each contribution of Gd and Fe to the Kerr rotation of a-GdFe. Comparing the Kerr spectrum of a-GdFe with that calculated from θK= KGd(λ) · MGd(T)+KFe(λ) · MFe(T), the Kerr spectrum of a-GdFe is fairly well explained by superposition of the contribution of Gd and Fe. It is concluded that the contribution of each sublattice is quite dependent on the photon energy in the range of 1.5 to 3 eV. Especially, the contribution of Gd becomes large with increasing photon energy and comparable to that of Fe at λ =400 nm.
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