Excellent microwave absorption performances of cobalt-doped SrFe12O19 hexaferrite with varying incident angles

Theoretical Study of Electric, Dielectric, and Optical Properties in Ion Doped Multiferroic SrFe12O19 Nanoparticles

“…The dielectric constant also increases with increasing Ni dopants. It should be mentioned that within our model and approximations we would also observe enhancement of the magnetization M and magnetic phase transition temperature T C by Co 2+ ion doping and their decrease by Mn 3+ doping as reported experimentally by [12,[48][49][50], respectively.…”

“…Let us emphasize that, recently, Co 2+ -, Ni 2+ -, or Mn 3+ -doped SFO NPs at the Fe site are also studied [12,13,17,31,48,49]. An increase in the magnetization is reported by Liu et al [48] and Thanh et al [49] and of the Curie temperature T C by Ruikar et al [12] with increasing Co dopants. Irshad et al [17] observed that the FE polarization P is increased and the optical band gap E g is reduced by Ni doping.…”

M-Type Ba-Hexaferrite Nanoplates with Exceptional Microwave Absorption Properties

“…The fluctuations observed within the 2–6 GHz range are a result of natural resonance. The peaks in the 6–18 GHz range may be the result of the emergence of behaviors favoring magnetic losses, such as magnetic exchange coupling resonance, spin resonance, or magnetic domain resonance. , Figure g shows the tangent curves of the dielectric loss and magnetic loss angles for the nanoplates (1:10-ratios-950 °C). In the low-frequency range, tan (ε) remains almost unchanged and its conduction is primarily caused by grain boundaries.…”

Influence of Gd and Ni doping on the structural, morphological, and magnetic properties of M-type calcium hexaferrite

“…1–7 Hexaferrites are widely applicable due to their specific properties like high saturation magnetization, corrosion resistance, high coercivity, and unique chemical stability and their significant magneto crystalline anisotropy constant is beneficial in high-frequency devices. 8–11 According to structural differences, ferrites have been categorized into four primary families: spinel, orthoferrite, garnet, and hexagonal, 12,13 in which hexagonal ferrites are further classified into six categories based on the chemical structures such as X-type (B 2 Me 2 Fe 28 O 46 ), Y-type (B 2 Me 2 Fe 12 O 22 ), Z-type (B 3 Me 2 Fe 24 O 41 ), M-type (BFe 12 O 19 ), W-type (Bme 2 Fe 16 O 27 ), and U-type (B 4 Me 2 Fe 36 O 60 ), where B represents a bivalent cation such as Ba 2+ , Sr 2+ , Pb 2+ , Cd 2+ , and Ca 2+ and Me represents the bivalent transition metals. 9,14,15 Due to the superexchange interaction, all hexaferrites exhibit ferrimagnetic behaviour.…”