Reduced saturation magnetization in cobalt antidot thin films prepared by polyethylene oxide-assisted self-assembly of polystyrene nanospheres

Chi-Chih Ho; Tung-Wu Hsieh; Hsiang-Hsi Kung; Wen-Tau Juan; Keng-Hui Lin; Wei-Li Lee
March 2010
Applied Physics Letters;3/22/2010, Vol. 96 Issue 12, p122504
Academic Journal
We have developed an approach to prepare large array nanostructured thin films using polyethylene oxide assisted self-assembly of polystyrene nanospheres as a template. By tuning the antidot diameter in the cobalt thin films, we found a crossover behavior in the magnetization reversal process. In addition, the effective moment per cobalt atom turns out to drop with growing antidot diameter which effectively increases the surface to bulk volume fraction. Our results suggest a tendency of reduced saturation magnetization in a ferromagnet/normal metal interface, where the mixing of itinerant electrons with ferromagnetic d electrons can give rise to observable effect.


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