Magnetic microstructure and electrical properties of ferrimagnetic oxide epilayers

Data are presented on the correlations between the angle the magnetization vector makes with the normal to the surface (theta) and the surface conduct ivity (sigma (s)) and activation energy for conduction in MnpMgqFe3-p-qO4+g amma epilayers. The orientation of the magnetic moment and the effective ma gnetic fields at Fe nuclei on tetrahedral and octahedral sites were determi ned by Mossbauer spectroscopy. It is shown that theta increases with sigma (s) and, according to x-ray diffraction data, depends on the density of mis fit dislocations. The revealed correlations are interpreted in terms of epi layer microstructure, electronic-ionic disordering, lattice mismatch, and J ahn-Teller effect. The development of uniaxial anisotropy in the layers stu died is due to the presence of the Jahn-Teller ion Mn3+, rather than Fe2+.