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Publication
Nano Letters
Paper
Phase Transformation, Coalescence, and Twinning of Monodisperse FePt Nanocrystals
Abstract
The phase transformation, coalescence, and twin structure of thermally annealed 6 nm FePt nanocrystals under high vacuum on an amorphous carbon surface have been investigated. A1-FePt phase to L10-FePt phase transformation occurs at 530°C. The multilayered nanocrystal assemblies coalesce to form larger grains at 600°C. These coalesced nanocrystals do not form a single grained structure; instead, twinning becomes a characteristic structure feature. The surface of the coalescent grains consists of {111} and (001) facets.