W0120

Magnetic Multilayers in a Series of BaO : TiO₂ : Fe₂O₃ Compounds. L.A. Bendersky, R.D.Shull, J.E. Bonevich, T.A. Vanderah and R.S. Roth Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg Md 20899, USA

In certain applications improved magnetic materials with higher dielectric properties are required. The system BaO :TiO₂ : Fe₂O₃ offers exciting possibilities for new materials where the high dielectric properties of the barium titanates can be combined with the strongly magnetic hexaferrites. In this work we will show that a group of newly discovered ternary BaO : TiO₂ : Fe₂O₃ compounds have structural features that allow us to describe the structures as natural magnetic multulayers. The structures have alternating layered slabs of different thickness ratio and period. The slabs are structurally and compositionally different. One of the slabs can be considered as a dielectric spacer for the slabs which have high concentration of Fe and are magnetic. Details of high-resolution and analytical transmission electron microscopy as well as measurements of magnetic properties of the compounds will be presented in the lecture.