Magneto-Optical Kerr Rotation Spectra and Perpendicular Anisotropy in Compositionally Modulated Multilayer Films of Co/Pt and Fe/Pt

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Abstract
Magneto-optical Kerr rotation (θK) spectra and magnetic properties such as saturation magnetization (M s) and perpendicular magnetic anisotropy of Co/Pt and Fe/Pt compositionally modulated multilayer films (CMF's) are investigated. An enhancement of θK is observed at the wavelengths of about 290 and 250 nm in Co/Pt and Fe/Pt CMF's, respectively. It is found that Fe/Pt CMF's turn into perpendicularly magnetized films in the same manner as Co/Pt CMF's when the Fe layer becomes thinner than about 5 Å.