Magneto-optical spectroscopy of [alpha Fe2O3/NiO](2.5) multilayers and NiFe2O4 films

The paper reports on magneto-optic Kerr spectroscopy in a series of [alpha Fe-2 O-3/NiO](2.5) multilayers and NiFe2O4 films at the photon energies ran ging from 1.2 to 4.5 eV, The samples were prepared by pulsed laser depositi on onto fused quartz substrates. The thickness of layers and the diffusion of Ni and Fe ions at interfaces were controlled by choice of the conditions of deposition and subsequent annealing. The magneto-optical response of th e model system [[alpha Fe2O3/NiFe2O4/NiO](2.5) (where interdiffusion is sim ulated by formation of ferrimagnetic NiFe2O4 interlayer) is determined by m eans of matrix calculation based on Yeh formalism and compared with experim ental data. From the analysis of polar Kerr rotation spectra of NiFe2O4 sin gle layers we denoted possible structural defects in these layers. (C) 2001 Elsevier Science B.V. All rights reserved.