Hard-Soft Magnetic Composite as Microwave Absorber in S-Band and C-Band

Abstract:

This research discusses synthesizing and characterizing magnetic hard-soft composite materials (Ba_0.6Sr_0.4Fe_11.5Al_0.5O₁₉/NiFe₂O₄) applied as microwave absorbers at S-band and C-band frequencies. The mechanical alloying method for sample synthesis uses a high-energy ball mill and sintering at high temperatures. Characterization of the crystal structure was done using an X-ray diffractometer. The Ba_0.6Sr_0.4Fe_11.5Al_0.5O₁₉ sample (hard magnetic) has a hexagonal structure, while the NiFe₂O₄ (soft magnetic) has a cubic structure. SEM analysis revealed a heterogeneous form with particle sizes ranging from 0.4 to 0.8 µm. Magnetization at room temperature was characterized using a vibrating-sample magnetometer (VSM). The magnetization saturation (Ms), magnetic remanent (Mr), and field coercivity (Hc) are 54.22 emu/g, 21.68 emu/g, and 0.876 kOe, respectively. Microwave absorption characterized using vector network analysis (VNA) shows that the hard-soft magnetic composite sample (Ba_0.6Sr_0.4Fe_11.5Al_0.5O₁₉/NiFe₂O₄) has a minimum reflection loss (RLmin) value of -29.86 dB for the S-band and -18.76 dB for the C-band area with an effective bandwidth reaching 2.34 GHz.

• Periodical: Solid State Phenomena (Volume 371)
• Pages: 121-130
• DOI: https://doi.org/10.4028/p-JH4Cm2
• Online since: May 2025
• Authors: Yohanes Edi Gunanto*, Jan Setiawan, Maya Puspitasari Izaak, Wisnu Ari Adi, Ade Mulyawan, Henni Sitompul, Yunasfi Yunasfi
• Keywords: Absorber, Composite, Hard-Soft Magnetic, Microwaves

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