Structural and magnetic properties of iron phthalocyanine (FePc) thin films deposited on sapphire substrates are studied as a function of deposition temperature and deposition thickness without annealing. The deposition temperature strongly affects the average grain size and also its distribution. The average grain size increases from 31nm at 25°C to 135nm at 260°C. Up to 230°C, the grain size increases exponentially with an activation energy of 81meV. By extracting the nominal circular diameter from atomic force microscopy images using an image segmentation algorithm, Gaussian grain distributions below 200°C and lognormal distributions above 230°C are observed. A quantitative analysis of the asymmetric growth is completed using elliptical grain fits. The data show that the major and minor axes are lognormal and Gaussian distributed, respectively. The magnetic response of these thin films gets stronger with grain size length.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 47/05M, Masters Abstracts International|
|Subjects:||Condensed matter physics|
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