Artificial superlattices of Co-(Pr,Nd) were fabricated on glass substrates using electron-beam evaporation. Magnetic properties such as 1) the temperature dependence of saturation magnetization, 2) the temperature dependence of the perpendicular magnetic anisotropy constant K⊥, and 3)the wavelength dependence of the polar Kerr rotation angle θK were systematically investigated. For Co/Pr and Co/Nd artificial superlattices, rare-earth atoms within 25 angstrom of the interface were found to be coupled ferromagnetically with Co atoms at 77 K. The K⊥ increases with decreasing artificial period D, for both the Co/Pr and Co/Nd artificial superlattices. The maximum values of K⊥ at 77 K are 10 × 106 erg/cm3 and 4 × 106 erg/cm3 for Co/Pr and Co/Nd, respectively. The wavelength at which the minimum θK is observed shifts from 0.45 μm to 0.65 μm with decreasing artificial period.
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