EFFECTS OF COMPOSITION AND SUBSTRATE TEMPERATURE ON THE AC PROPERTIES OF CO-EVAPORATED MN/SIOX THIN FILMS

摘要

Capacitance, a.c, conductance and loss factor have been measured in Cu-Mn/SiOx-Cu sandwich structures with compositions 1, 3, 5 and 10 at% Mn in the frequency range 10-10(6) Hz between temperatures of 110 and 500 K. The capacitance has a weak minim um at 1.0 MHz for all temperatures, whilst the a.c. conductance increases between four and eight orders of magnitude for temperatures of 150 and 473 K, respectively. Various a.c. conduction models have been considered, and it has been concluded that correlated barrier hopping best describes the results. The Goswami-Goswami model was used to describe the variation of loss factor with temperature and composition. [References: 16]