A Polyferroplatinyne Precursor for the Rapid Fabrication of L1_0-FePt-type Bit Patterned Media by Nanoimprint Lithography

摘要

As the magnitude of information created and stored grows exponentially, a new type of magnetic material with ultrahigh density for data recording is urgently needed in a modern society. L_(10) phase (or face-centered tetragonal, fct, phase) FePt alloy nanoparticles (NPs) have been studied extensively in the last decade, because of their interesting redox, catalytic, and magnetic properties. The use of L_(10)-ordered FePt NPs as the candidate for the ultrahigh-density magnetic data storage media is a consequence of its extraordinarily large uniaxial magnetocrystalline anisotropy (which can reach up to K_u ≈ 7 × 10~6 J m~(-3)) in the bulk phase and high chemical stability. This has inspired scientists to explore different methods to gen erate L_(10)-ordered FePt NPs with controllable size and high coer civity (a parameter indicative of magnetocrystalline anisotropy) which are closely related to the size and purity of NPs.