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To obtain practical magnetooptical materials having large Kerr rotation Θk, high perpendicular coercivity Hc and relatively low Curie temperature Tc(~200), rare-earth elements having a one-ion anisotropy were added to Gd-Fe-Co amorphous alloy system, which has a large intrinsic Kerr rotation but an in-plain anisotropy. As a result, replacing Gd by Tb,Dy,Ho, a large perpendicular anisotropy Ku is induced associating with the increase of Hc. With the optimization of their compositions, Gd-R-Fe-Co (R=Tb,Dy,Ho) amorphous films with Θk= 0.42-0.45° (at the wavelength of 822nm), Tc~200, and Hc=160-400 kA/m(2-5 kOe) were obtained.
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Takayama et al. (1987) studied this question.
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