Synthesis of super-fine L10-FePt nanoparticles with high ordering degree by two-step sintering under high magnetic field

doi:10.1016/j.jmst.2020.09.026

Abstract

Abstract:

Super-fine L1₀-FePt nanoparticles (NPs) with high ordering degree were successfully prepared by a modified two-step sintering method, which includes low-temperature pre-sintering, and the high magnetic field (HMF) assisted post-sintering processes. The particle size of the L1₀-FePt NPs was obviously refined by lowering the sintering temperature. By applying the HMF during the post-sintering process, the fine size characteristics of L1₀-FePt NPs were retained, and the ordering degree was significantly improved. The L1₀-FePt NPs with sizes of about 4.5 nm, ordering degree of 0.940, and coercivity of 22.01 kOe were obtained by this two-step sintering under a magnetic field of 12 T. The mechanism investigation of HMF enhancing the ordering degree indicates that the HMF enhances lattice distortion and magnetization energy (Zeeman energy). The enhanced lattice distortions cause high stress existing in the lattice, which can effectively promote the disordered-order transition. When the magnetic field reaches to 3 T, the Zeeman energy of the NPs is higher than the thermal disturbing energy of the NPs, and the magnetization effect is stronger. Therefore, the HMF (higher than 3 T) can obviously improve the disorder-order transition by lowering the energy barrier and accelerating the orderly diffusions of atoms. The HMF is a promising assistant to synthesize the L1₀-phase NPs with both of high ordering degree and super-fine size.

Key words: L1₀-FePt nanoparticles, Super-fine size, Disorder-order transition, High magnetic field, Zeeman energy

Dong Zhao, Xiaoyang Wang, Ling Chang, Wenli Pei, Chun Wu, Fei Wang, Luran Zhang, Jianjun Wang, Qiang Wang. Synthesis of super-fine L1₀-FePt nanoparticles with high ordering degree by two-step sintering under high magnetic field[J]. J. Mater. Sci. Technol., 2021, 73: 178-185.

Figures/Tables 5

Fig. 1. Schematic representation of the synthesis of super-fine L10-FePt NPs with high ordering degree.

Fig. 2. (a) TEM image, (b) HRTEM image, (c) XRD pattern, and (d) room temperature hysteresis loop of the pre-sintered FePt NPs.

Fig. 3. (a) XRD patterns, (b) lattice parameters, and high-resolution XPS spectra of (c) Fe 2p and (d) Pt 4f of the FePt NPs after post-sintering with different HMFs.

Fig. 4. TEM images of the post-sintered L10-FePt NPs under magnetic field of (a) 0 T, (b) 3 T, (c) 6 T, and (d) 12 T. (e) SAED pattern, (f) HRTEM image, and (g) STEM-EDS element mapping of L10-FePt nanoparticle synthesized with 12 T HMF.

Fig. 5. (a) Size distributions, (b) room-temperature hysteresis loops, (c) coercivity, and (d) lattice distortion rate δ of the L10-FePt NPs synthesized with various HMFs. (e) Comparing the thermal energy (0 T) and Zeeman energy (1, 3, 6, 12 T) of FePt NPs at different temperatures. (f) Zeeman energy factors φ of FePt NPs under different magnetic flux density B.

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Synthesis of super-fine L1₀-FePt nanoparticles with high ordering degree by two-step sintering under high magnetic field

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