Structural and magnetic properties of the ordered FePt3, FePt and Fe3Pt nanoparticles

Tuning crystal structure and magnetic property of dispersible FePt intermetallic nanoparticles

“…FePt intermetallic NPs can form two crystal structures depending on their composition. The structural change can be obviously evidenced by the shift of FePt (111) , which is similar to the previous result [23]. No obvious hysteresis is observed from the magnetization curve.…”

“…Liu et al [23] first reported a systemic study on FePt intermetallic NPs prepared by a sol-gel method. However, high temperature annealing (700°C) is required to induce the formation of chemically ordered FePt intermetallics, which causes NPs aggregated and sintered.…”

Inducing formation of L10-phase in concave-cube FePt nanoparticles by annealing under high magnetic field

“…The strength of the HMF cannot affect the shape, size and composition evolutions of FePt NPs during annealing, but induces the formation of L1 0 -FePt NPs. In the equilibrium phase diagram of FePt alloys, the maximum Fe content in L1 0 -phase is about 70% [27,28]. The Fe content in annealed NPs is about 72.1%, closes to the critical value, which suggests the possibility of formation L1 0 -FePt NPs.…”

Size control of L12-FePt3 nanocrystals by spin-coating method

“…The sharp peak at 2h = 33°indicates the presence of silicon on the substrate. The (001), (110), (111), (200) and (201) peaks belong to the FCC cubic structure of the FePt 3 with L1 2 -compositional order [2,4], which its lattice parameter is 3.86 Å . In XRD pattern of the FCC structure, the presence of the (001) peak at 2h = 23°corresponds to the L1 2 -chemical order [4].…”

“…The fabricated Fe 1-x Pt x nanocrystals have chemically disordered FCC cubic structure [1] and by annealing them at temperature of 600°C, depending on x, one of the two L1 0 or L1 2 chemically ordered phase is formed [2]. For 0.35 \ x \ 0.55, a ferromagnetic fct-L1 0 phase with high coercivity (H c ) can be achieved [3,4].…”