Abstract
M-type hexagonal barium ferrites come in the category of magnetic material that plays a key role in electromagnetic wave propagation in various microwave devices. Due to their large magnetic anisotropy and large magnetization, their operating frequency exceeds above 50 GHz. Doping is a way to vary its magnetic properties to such an extent that its ferromagnetic resonance (FMR) response can be tuned over a broad frequency band. We have done a complete FMR study of rare earth elements neodymium (Nd) and samarium (Sm), with cobalt (Co) as base, doped hexaferrite nanoparticles (NPs). X-ray diffractometry, vibrating sample magnetometer (VSM), and ferromagnetic resonance (FMR) techniques were used to characterize the microstructure and magnetic properties of doped hexaferrite nanoparticles. Using proper theoretical electromagnetic models, various parameters are extracted from FMR data which play important role in designing and fabricating high-frequency microwave devices.
Highlights
The vast applications of Barium hexaferrite (BaM) cover almost all the branches of science
In its pure form, BaM has a large uniaxial anisotropy, high saturation magnetization, and very large coercive field. These extreme properties present the scope of modulation in magnetic properties of BaM and make it a material of choice for a diverse range of microwave applications
Substitution of the rare earth elements (Samarium and Neodymium) due to their typical relaxation mechanism can alter the electromagnetic response of hexaferrite material.[6]
Summary
The vast applications of Barium hexaferrite (BaM) cover almost all the branches of science. In its pure form, BaM has a large uniaxial anisotropy, high saturation magnetization, and very large coercive field. These extreme properties present the scope of modulation in magnetic properties of BaM and make it a material of choice for a diverse range of microwave applications. Sensors.[9] The operating frequency of the doped hexaferrites was lowered down from 51 GHz (pure BaM) to 18 GHz for rare earth doped ferrite at around 9 KOe bias magnetic fields. The wet slurry was dried on a hot plate and the dry powder was calcined at 10000C for 4 hours to get pure phase NPs. Four different samples: S1(BaFe12O19), S2(BaCo0.5Fe11.5O19), S3(BaCo0.5Nd0.3Fe11.2O19) and S4(BaCo0.5Sm0.3Fe11.2O19) were prepared using above mentioned method. The scattering parameter (S21) were recorded from the vector network analyzer (PNA-N5224A) for each field-sweep at a fixed frequency to derive resonance field (Hr) and resonance linewidth (∆H) from the absorption data
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