4.8 Article

Halide Ion-Mediated Synthesis of L10-FePt Nanoparticles with Tunable Magnetic Properties

Journal

NANO LETTERS
Volume 18, Issue 12, Pages 7839-7844

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03603

Keywords

L1(0)-FePt; nanoparticle; hard magnetic; coercivity; halide ions

Funding

  1. National Natural Science Foundation of China [51571072, 51590882, 51631001]
  2. National Key R&D Program of China [2017YFA0206301]
  3. Fundamental Research Funds for the Central Universities [AUGA5710012715]
  4. Heilongjiang Postdoctoral Scientific Research Development Fund [LBH-Q14058]
  5. China Postdoctoral Science Foundation [2015M81436]
  6. Heilongjiang Postdoctoral Science Foundation [LBH-Z15065]

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L1(0)-FePt nanoparticles (NPs) have great potential in areas of advanced magnetic and catalytic applications. Here, we present a facile control route for synthesis of hard magnetic L1(0)-FePt NPs in which halide ions (Cl-, Br-, or I-) were added to the synthetic process to promote the phase transformation. It is confirmed that the strong ionic binding force between halide ions and Fe3+ or Pt2+ ions could facilitate the formation of L1(0)-FePt phase due to favoring growth of FePt NPs in a more thermodynamically stable way, which enables the formation of an ordered structure. L1(0)-FePt NPs with the highest coercivity of 8.64 kOe and saturation magnetization of 64.21 emu/g at room temperature can be directly obtained by controlling the amount of the halide ions. In comparison with conventional solution phase reduction methods, the halide ion-assisted method shows enhanced capability to tune the growth of hard magnetic bimetallic NPs, particularly Pt-based bimetallic NPs.

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