Vapor deposition polymerization by a coevaporation of pyromellitic dianhydride and decamethylenediamine monomers has been employed for the preparation of polyamic acid as a precursor for polyimide films. By curing at temperatures of 200–250°C the polyamic acid became the polyimide with directional arrangement of the molecular chain in the normal to the substrate observed by wide-angle X-ray diffraction. The sample containing a large amount of oriented crystals showed a small photocurrent. It was concluded that the oriented chain containing a decamethylene moiety hinders the carrier transfer between pyromellitimide moieties, resulting in a decrease of current.
Nanoscale Fe/Mo multilayers were synthesized by means of ion beam sputtering. The microstructure of the multilayers was investigated by low-angle and high-angle x-ray diffraction, cross section and plan view transmission electron microscopy, and Mossbauer spectra. Fe layers in the films become continuous when their thickness is more than 9 A. The FeiMo interface roughness was observed to be less than 3 A. In this system the enhanced magnetization (as much as 26%) was measured by a vibrating sample magnetometer at a certain range of the individual layer thickness of the two componehts. An anomalous dependence of Fe saturation magnetization against the thickness of MO layer was found in the series of Fe 25 &MO films.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.