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Superstructure magnetic anisotropy in Fe3O4 nanoparticle chains

Author

Listed:
  • Jeotikanta Mohapatra

    (University of Texas at Arlington)

  • Pramanand Joshi

    (University of Texas at Arlington)

  • Hur Abbas

    (University of Texas at Arlington)

  • Markus Gusenbauer

    (Christian Doppler Laboratory for Magnet Design Through Physics Informed Machine Learning
    Danube University Krems)

  • Kaifu Bian

    (Sandia National Laboratories)

  • Ping Lu

    (Sandia National Laboratories
    Sandia National Laboratories)

  • Hongyou Fan

    (Sandia National Laboratories
    Sandia National Laboratories)

  • Thomas Schrefl

    (Christian Doppler Laboratory for Magnet Design Through Physics Informed Machine Learning
    Danube University Krems)

  • J. Ping Liu

    (University of Texas at Arlington)

Abstract

Magnetic anisotropy is essential for many applications of ferromagnetic/ferrimagnetic materials, including permanent magnets and magnetic recording media. Attempts have been made recently to build up 3-D nanoparticle and quantum dot assemblies, however, it is not understood yet if a nanoparticle assembly can possess high magnetic anisotropy with low anisotropic materials. In this article, we report our discovery of high magnetic anisotropy resulted from Fe3O4 nanoparticle chains. We started with closely-packed nanoparticle assemblies of spherical Fe3O4 nanoparticles that exhibit low magnetocrystalline anisotropy and shape anisotropy, and corresponding negligible coercivity. When the nanoparticle assemblies are compressed under pressure, they form bundles or arrays that consist of Fe3O4 chains with a length scale of several hundred nanometers. Magnetic measurements show that these Fe3O4 chain arrays possess a high uniaxial magnetic anisotropy (Keff ~ 2.9×105 J/m³) and significant magnetic coercivity. Our simulations reveal that interparticle magnetic dipolar interactions contribute to this type of superstructure magnetic anisotropy. This study demonstrates the feasibility and approaches to create “patterned” high magnetic anisotropy in nanoparticle superstructures/assemblies.

Suggested Citation

  • Jeotikanta Mohapatra & Pramanand Joshi & Hur Abbas & Markus Gusenbauer & Kaifu Bian & Ping Lu & Hongyou Fan & Thomas Schrefl & J. Ping Liu, 2025. "Superstructure magnetic anisotropy in Fe3O4 nanoparticle chains," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60888-x
    DOI: 10.1038/s41467-025-60888-x
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    References listed on IDEAS

    as
    1. Hao Zeng & Jing Li & J. P. Liu & Zhong L. Wang & Shouheng Sun, 2002. "Exchange-coupled nanocomposite magnets by nanoparticle self-assembly," Nature, Nature, vol. 420(6914), pages 395-398, November.
    2. Binsong Li & Kaifu Bian & J. Matthew D. Lane & K. Michael Salerno & Gary S. Grest & Tommy Ao & Randy Hickman & Jack Wise & Zhongwu Wang & Hongyou Fan, 2017. "Correction: Corrigendum: Superfast assembly and synthesis of gold nanostructures using nanosecond low-temperature compression via magnetic pulsed power," Nature Communications, Nature, vol. 8(1), pages 1-2, August.
    3. Binsong Li & Kaifu Bian & J. Matthew D. Lane & K. Michael Salerno & Gary S. Grest & Tommy Ao & Randy Hickman & Jack Wise & Zhongwu Wang & Hongyou Fan, 2017. "Superfast assembly and synthesis of gold nanostructures using nanosecond low-temperature compression via magnetic pulsed power," Nature Communications, Nature, vol. 8(1), pages 1-9, April.
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