Abstract
L10 ordered FePt and FePtCu nanoparticles (NPs) with a good dispersion were successfully fabricated by a simple, green, one-step solid-phase reduction method. Fe (acac)3, Pt (acac)2, and CuO as the precursors were dispersed in NaCl and annealed at different temperatures with an H2-containing atmosphere. As the annealing temperature increased, the chemical order parameter (S), average particle size (D), coercivity (Hc), and saturation magnetization (Ms) of FePt and FePtCu NPs increased and the size distribution range of the particles became wider. The ordered degree, D, Hc, and Ms of FePt NPs were greatly improved by adding 5% Cu. The highest S, D, Hc, and Ms were obtained when FePtCu NPs annealed at 750 °C, which were 0.91, 4.87 nm, 12,200 Oe, and 23.38 emu/g, respectively. The structure and magnetic properties of FePt and FePtCu NPs at different annealing temperatures were investigated and the formation mechanism of FePt and FePtCu NPs were discussed in detail.
Highlights
Diego Cazorla-AmorósMagnetic nanomaterials, one kind of the most important functional materials, have been widely used in many fields
It can be seen that the FePt NPs prepared at 400 ◦ C shows the fcc structure
The peaks shift to the high angle which means that FePt NPs started to form the
Summary
Diego Cazorla-AmorósMagnetic nanomaterials, one kind of the most important functional materials, have been widely used in many fields. Chemically ordered L10 -FePt has attracted much attention because of its very high magnetocrystalline anisotropy constant (Ku ) (7 × 107 ergs/cc), which allows very low critical superparamagnetic size (~ 3–4 nm), high Curie temperature, good chemical stability, and biological compatibility [1,2,3] These properties promote the important potential applications of L10 FePt in the high-density magnetic recording medium [4,5], high performance permanent magnetic materials [6,7], catalysts [8,9], and biological applications [10,11,12,13]. In 2000, Sun et al successfully prepared mono-disperse spherical FePt nanoparticles (NPs) by using a thermal decomposition method [14]. Since the pioneering work of Sun et al, the size and morphology control of
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