Microwave absorption performance of M-type hexagonal ferrite and MXene composite in Ka and V bands (5G mmWave frequency bands)

Hoyun Won, Yang Ki Hong, Minyeong Choi, Hector Garcia, Dongmyung Shin, Young Sik Yoon, Kwangjoo Lee, Hao Xin, Chang Dong Yeo

Research output: Contribution to journalArticlepeer-review

Abstract

Lightweight and thin electromagnetic interference (EMI) shielding materials with high shielding effectiveness (SE) have been investigated over the last decade to address the unreliability issue in all electronic technologies caused by EMI. Herein, we report the SE of the novel Ti3C2Tx MXene/doped-hexaferrite (hexagonal ferrite: BaCo0.3Ti0.3Fe11.4O19) composite. This composite suppresses electromagnetic (EM) waves dominantly via absorption over the frequency range from 30 to 50 GHz for millimeter-wave (mmWave) applications. Two-dimensional inorganic compound Ti3C2Tx MXene was synthesized using the LiF-HCl etching process, and doped-hexaferrite particles were prepared using a conventional solid-state reaction. Then, the MXene/doped-hexaferrite composite was fabricated by mixing MXene/polyvinyl-pyrrolidone (PVP) containing solution with the hexaferrite particles. The composites were characterized by a vibrating sample magnetometer for static magnetic properties and a vector network analyzer for dynamic magnetic and dielectric properties and microwave absorbing performance. A high magnetocrystalline anisotropy of hexaferrite shifted the microwave absorption peak to mmWave bands such as Ka- and V-bands, unlike spinel ferrite. The 1.5 mm thick MXene/45 wt% doped-hexaferrite composite shows a broad effective bandwidth (reflection loss (RL) less than 10 dB) of 7 GHz in the frequency range from 38 to 45 GHz. This excellent absorbing performance is mainly attributed to improved impedance matching and enhanced dielectric and magnetic losses of the composite. It was found that the SE was dominated by absorption instead of reflection. The experimental results demonstrate that the MXene/BaCo0.3Ti0.3Fe11.4O19 hexaferrite composite can be a promising and effective EM wave absorber material for millimeter-wave applications such as the fifth-generation (5G) network and opens up new opportunities for THz (6G network) EMI materials development.

Original languageEnglish (US)
Article number169523
JournalJournal of Magnetism and Magnetic Materials
Volume560
DOIs
StatePublished - Oct 15 2022

Keywords

  • Absorber
  • Electromagnetic interference
  • Ferromagnetic resonance
  • Hexaferrite
  • MXene
  • Shielding effectiveness

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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