A Micellar Approach to Magnetic Ultrahigh-Density Data-Storage Media: Extending the Limits of Current Colloidal Methods

摘要

We have presented a new approach to prepare arrays of well-separated, ligand-free, as well as oxide-free FePt alloy nanoparticles based on the self-organization of metal-salt-loaded diblock copolymer reverse micelles. After depositing a micellar monolayer on a silicon substrate followed by a plasma-induced removal of the polymer-matrix, superparamagnetic nanodots in the chemically disordered fcc phase were obtained. These dots were then annealed to elevated temperatures, yielding the magnetically attractive L1_0 phase without any indication of sintering, thus avoiding all of the drawbacks of the standard colloidal approaches for fabricating fct FePt nanoparticles.