Studies on Exchange-Coupled Magnetodielectric Ceramics for Microwave Absorption in Ku-Band

Series of exchange-coupled BaFe 12 O 19 (BaM)/CoFe 2 O 4 (CFO) and BaM/Co 0.5 Zn 0.5 Fe 2 O 4 (CZFO) composites were synthesized using the autocombustion method. Effect of soft (CFO/CZFO) phase weight fraction on structural, magnetic, and microwave properties of composites has been investigated and...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2021-03, Vol.57 (3), p.1-7
Main Authors: Pahwa, Chhavi, Mahadevan, Santhoshkumar, Narang, Sukhleen Bindra, Sharma, Puneet
Format: Article
Language:English
Subjects:
Barium hexaferrite
Cobalt ferrites
Coercivity
Complex permittivity
Composite materials
Couplings
Demagnetization
Diffraction patterns
Exchange coupling
Exchanging
hard ferrite
Magnetic permeability
Magnetic properties
Magnetic resonance
Magnetic saturation
Magnetism
magnetodielectric properties
Microwave absorption
Perpendicular magnetic anisotropy
Photomicrographs
Saturation magnetization
soft ferrite
Soft magnetic materials
Zinc
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Summary:Series of exchange-coupled BaFe 12 O 19 (BaM)/CoFe 2 O 4 (CFO) and BaM/Co 0.5 Zn 0.5 Fe 2 O 4 (CZFO) composites were synthesized using the autocombustion method. Effect of soft (CFO/CZFO) phase weight fraction on structural, magnetic, and microwave properties of composites has been investigated and compared. X-ray diffraction patterns and scanning electron microscope (SEM) micrographs confirmed the presence of BaM and CFO/CZFO phases with well-distinguished grains in the composites. Existence of interfacial coupling was verified by smooth demagnetization behavior and single peak in corresponding \text{d}M/\text{d}H curves. Saturation magnetization ( M_{s} ) and coercivity showed strong dependence on exchange interactions between hard and soft magnetic spins. Compared to BaM, M_{s} of composites were 22% and 36% higher with CFO and CZFO, respectively. Frequency-dependent complex permittivity ( \varepsilon ) and permeability ( \mu ) in {\text{K}}_{u} -band were found to be dependent upon the relative composition and nature of soft phase. Maximum \varepsilon of 45 and \mu of 1.6 were achieved for BaM/CFO (50/50) composite. Exchange-coupled magnetodielectric with high \varepsilon and \mu were developed for various microwave applications.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3052035