Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 526, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2021.167731
Keywords
L1(0)-FePt nanoparticles; High magnetic field; Disorder-order transition; Orientation attachment growth; Magnetic property
Funding
- National Natural Science Foundation of China [51871045, 51690161]
- Fundamental Research Funds for the Central Universities [N180912004, N180915002, N170908001, N2017003]
- Liaoning Revitalization Talents Program [XLYC1908002]
- Basic Research Program of the Key Laboratory of Liaoning Province [LZ2015035]
- Doctoral Start-up Foundation of Liaoning Province [2019-BS-116]
- Project of Fundamental Research of the Education Department of Liaoning Province [LJ2020JCL032]
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The introduction of high magnetic field during wet-chemical synthesis of FePtCu nanoparticles was shown to enhance the disorder-order transition and increase the ordering degree of the nanoparticles. The magnetic field also improved the alignment growth and magnetic properties of the nanoparticles, demonstrating a promising method for controlling their properties.
Developing a novel strategy for promoting the disorder-order transition of FePt nanoparticles (NPs) is helpful to improve magnetic and electrocatalytic properties of the FePt NPs. In this research, high magnetic field (HMF) was introduced to wet-chemical synthesis of the L1(0)-FePt NPs. The effects of HMF on the growth and magnetic property of wet-chemical synthesized L1(0)-FePtCu NPs were studied. Cu atoms preferred to occupy the Fe-site in L1(0)-FePt lattice at 6 T HMF, which facilitated this disorder-order transition and increased the ordering degree of L1(0)-FePtCu NPs. When the magnetic dipolar interaction energy was much higher than the thermal energy, the HMF also enhanced the orientation attachment of L1(0)-FePtCu NPs along < 001 > direction, which would lead to the increasing of growing rate and the aligning of NPs. The HMF increased the coercivity of L1(0)-FePtCu NPs by increasing the grain size and the ordering degree. This work provides a promising method for controlling the disorder-order transition, the attachment growth, and the magnetic property of wet-chemical synthesized NPs.
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