Magneto-optical Kerr effect of Fe/Cu compositionally modulated multilayered films

Abstract
The wavelength dependence of polar magneto‐optical Kerr rotation (θK) and the structure of Fe/Cu compositionally modulated multilayered films with the modulation length (D) up to ∼95 Å were investigated. It has been found that values of θK are low and Kerr rotation spectra are simple in wavelength region between 250 and 800 nm for the films with relatively small D. However, a new peak of θK appears at around 560 nm, corresponding to the absorption edge of Cu metal, and becomes large with the increase of D. The new peak moves towards the longer wavelength side with the increase of thickness ratio (Fe/Cu) of Fe to Cu layers.