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Tunable and Synergistic Enhancement of Electromagnetic Shielding Efficiency through Zn Doping in NiFe₂O₄/MWCNT Hybrid Architectures.

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Title: Tunable and Synergistic Enhancement of Electromagnetic Shielding Efficiency through Zn Doping in NiFe₂O₄/MWCNT Hybrid Architectures.
Authors: Kumar, Suraj1,2 (AUTHOR), Kumar, Sumit3 (AUTHOR) sumit95.mittal@gmail.com, Singh, Neelam4 (AUTHOR), Verma, Vivek5 (AUTHOR), Meenakshi1 (AUTHOR), Kumar, Prashant6 (AUTHOR), Arora, Vijay7 (AUTHOR)
Source: Journal of Superconductivity & Novel Magnetism. Jun2026, Vol. 39 Issue 3, p1-14. 14p.
Abstract: In this study, hybrid composites with improved EMI shielding in the Ku-band (12.4–18 GHz) were created using Zn-doped nickel ferrite nanoparticles (x = 0, 0.1, 0.2, 0.3, 0.4) and multi-walled carbon nanotubes (MWCNTs). X-ray diffraction showed that all compositions formed a pure cubic spinel phase with regular changes in lattice parameter and crystallite size as a function of Zn concentration, affecting cation distribution and magnetic behavior. VSM tests at room temperature showed soft-magnetic properties with moderate coercivity and a non-monotonic saturation magnetization trend, peaking at 41.1 emu/g for x = 0.2 before dropping at higher doping levels. EMI shielding efficacy was assessed using a vector network analyzer and 12.4–18 GHz transmission/reflection (S-parameter) tests. The Ni₀.₈Zn₀.₂Fe₂O₄/MWCNT composite had the maximum shielding efficacy of 61 dB due to synergistic dielectric and magnetic loss processes, enhanced impedance matching, and significant interfacial polarization from the conductive MWCNT network and magnetic ferrite phase. These findings show that controlled Zn substitution and MWCNT hybridization can be used to create lightweight, broadband, high-performance EMI shielding materials for aerospace, military, and next-generation telecommunications applications. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Superconductivity & Novel Magnetism is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Tunable and Synergistic Enhancement of Electromagnetic Shielding Efficiency through Zn Doping in NiFe₂O₄/MWCNT Hybrid Architectures.
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  Data: <searchLink fieldCode="AR" term="%22Kumar%2C+Suraj%22">Kumar, Suraj</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kumar%2C+Sumit%22">Kumar, Sumit</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> sumit95.mittal@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Singh%2C+Neelam%22">Singh, Neelam</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Verma%2C+Vivek%22">Verma, Vivek</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meenakshi%22">Meenakshi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kumar%2C+Prashant%22">Kumar, Prashant</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Arora%2C+Vijay%22">Arora, Vijay</searchLink><relatesTo>7</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Superconductivity+%26+Novel+Magnetism%22">Journal of Superconductivity & Novel Magnetism</searchLink>. Jun2026, Vol. 39 Issue 3, p1-14. 14p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this study, hybrid composites with improved EMI shielding in the Ku-band (12.4–18 GHz) were created using Zn-doped nickel ferrite nanoparticles (x = 0, 0.1, 0.2, 0.3, 0.4) and multi-walled carbon nanotubes (MWCNTs). X-ray diffraction showed that all compositions formed a pure cubic spinel phase with regular changes in lattice parameter and crystallite size as a function of Zn concentration, affecting cation distribution and magnetic behavior. VSM tests at room temperature showed soft-magnetic properties with moderate coercivity and a non-monotonic saturation magnetization trend, peaking at 41.1 emu/g for x = 0.2 before dropping at higher doping levels. EMI shielding efficacy was assessed using a vector network analyzer and 12.4–18 GHz transmission/reflection (S-parameter) tests. The Ni₀.₈Zn₀.₂Fe₂O₄/MWCNT composite had the maximum shielding efficacy of 61 dB due to synergistic dielectric and magnetic loss processes, enhanced impedance matching, and significant interfacial polarization from the conductive MWCNT network and magnetic ferrite phase. These findings show that controlled Zn substitution and MWCNT hybridization can be used to create lightweight, broadband, high-performance EMI shielding materials for aerospace, military, and next-generation telecommunications applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Superconductivity & Novel Magnetism is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10948-026-07200-0
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      – TitleFull: Tunable and Synergistic Enhancement of Electromagnetic Shielding Efficiency through Zn Doping in NiFe₂O₄/MWCNT Hybrid Architectures.
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              M: 06
              Text: Jun2026
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              Y: 2026
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