Investigation of pyrolysis temperature in the one-step synthesis of L1₀ FePt nanoparticles from a FePt-containing metallopolymer

Abstract

Ferromagnetic (L1 0 phase) FePt alloy nanoparticles (NPs) with extremely high magnetocrystalline anisotropy are considered to be very promising candidates for the next generation of ultrahigh-density data storage systems.The question of how to generate L1 0 FePt NPs with high coercivity, controllable size, and a narrow size distribution is a challenge. We report here a single-step fabrication of L1 0 FePt NPs by employing one of the two new polyferroplatinyne bimetallic polymers as precursors. The influence of the pyrolysis temperature on the size and magnetic properties of the resulting FePt alloy NPs has been investigated in detail.

Patterning of L10FePt nanoparticles with ultra-high coercivity for bit-patterned media

“…Such a large coercivity further verified that the NPs indeed showed highly ordered L10 structure. As compared to the FePt NPs prepared from the similar methods reported in the literature, the coercivity in the present study was significantly increased from 1.4 T to 3.6 T, 10,41,42 which is even larger than the value (3.3 T) reported by Sun et al. 45 To our knowledge, this value represents the largest magnetic coercivity value for L10-FePt NPs ever reported.…”

“…[38][39][40] We have previously reported a series of Fe,Pt-containing metallopolymers as precursors to prepare L10-FePt NPs by the one-pot pyrolysis under an inert atmosphere. 10,41,42 These single-source polymer precursors could also be used as photoresist to afford micro-or nano-patterns by EBL or NIL. 43,44 However, the coercivities of the as-synthesized FePt NPs are still relatively low, which would restrict their potential for magnetic data recording media.…”

Why is Ferrocene so Exceptional?

“…Metallopolymers containing ferrocene units have been applied for redox‐triggered release of a dye from patchy nanocapsules, for switching of surface wettability, in memory devices, and for permselective membrane gating . A good number of reported polymers are water‐soluble as a result of the introduction of PEG or polyelectrolyte blocks , , , , …”

A molecular approach to magnetic metallic nanostructures from metallopolymer precursors

“…Iron-platinum alloy NPs have drawn extensive attention because of their remarkable magnetic properties, which can be generated from FePt-containing metallopolymer precursors through the single-step pyrolysis. 2,3,18 Initially, some polyferroplatinynes with phosphine ligands on Pt (e.g. P1 in Fig.…”