Synthesis of Ultrasmall Ferromagnetic Face‐Centered Tetragonal FePt–Graphite Core–Shell Nanocrystals

A graphite coat: Ultrasmall L10-ordered face-centered tetragonal FePt–graphite shell nanocrystals were synthesized by a simple one-step CVD process. Particles with sizes between 1 and 3 nm were readily obtained by varying the amount of metal precursors loaded on a silica support. FePt–graphite shell nanocrystals with mean diameter ≈2.8 nm (see picture) exhibit ferromagnetism with relatively high coercivity at room temperature and superior chemical stability against etching and oxidation.