Perpendicular Magnetization in Self-Assembled Films of Citrate-Capped -Fe2O3 Nanocrystals on Si(100) Surfaces
-Fe2O3 nanocrystals capped with citrate and octylamine have been chemically prepared. The octylamine-capped nanocrystals exhibit a tendency to form ordered lattices. Films of nanocrystals of varying thickness (454, 720, and 1400 g/cm2 in the case ofcitrate-capped nanocrystals and 300 g/cm2 in the case of octylamine-capped nanocrystals) have been prepared on Si(100) substrates by drop casting and have been characterized by X-ray diffraction, scanning electron microscopy, and atomic force microscopy. Magnetic measurementshave been carried out on the films as well as on nanocrystal powders. The films of citrate-capped -Fe2O3 nanocrystals exhibit enhanced perpendicular magnetization, with the anisotropy depending on the film thickness.
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Document Type: Research Article
Publication date: 2005-04-01
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