Abstract
[ Fe 2 O 3 /NiO ] N multilayer films prepared by pulsed laser deposition display oscillation observed in the magnetization M as a function of N or the number of interfaces i=2N−1 indicating that they are not symmetric. In this work magneto-optic (MO) polar Kerr rotation spectra of some samples in the photon energy range 1.2–4.5 eV are reported. Faraday rotation (FR) was studied at 632.6 and 550 nm laser wavelengths. It shows the oscillations with N in accordance with M. Polar Kerr rotation spectra show a series of peaks which could be assigned to nickel ferrite NiFe2O4 formed at the interfaces between NiO and αFe2O3. The amplitudes change strongly with N as expected from N dependence of FR and M. A simple analytical expression is proposed to explain the complex phase relations among the contributions from individual ferrimagnetic interfaces to the total MO Kerr rotation in the multilayers.
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