Magnetic particle based absorbing materialsIt exhibits good absorption performance in the frequency range of 8-12 GHz, due to its unique magnetic properties and particle size. This article will discuss advanced technology from two aspects, namely nano ferrite and magnetic metal micro powder.
Nano ferrite, as an emerging magnetic particle based absorbing material, has high absorbing performance. first,
Nano ferriteThe particles have a larger specific surface area, and the surface atomic band structure is different from that in the body, so they have higher coercivity, which can cause absorption mechanisms such as hysteresis loss, interface polarization, and multiple scattering. Secondly, due to the size of nanoparticles being much smaller than the wavelength of electromagnetic waves, compared to general absorbing materials, nano ferrites have a higher transmittance of electromagnetic waves. Advanced Institute of Technology research has found that the maximum reflectivity of ferrite samples with a particle size of 5 μ m is -17dB, while the maximum reflectivity of ferrite samples with a particle size of 65nm is -28.5dB. This indicates that as the particle size decreases, the absorption efficiency of ferrite materials has been significantly improved.
Another category of magnetic particle based absorbing materials is magnetic metal micro powders, including cobalt, nickel, cobalt nickel alloys, iron nickel alloys, aluminum nickel alloys, and various organic modified metal micro powders. These micro powders not only have the characteristic of free electron absorption, but also have the effect of magnetic loss, so their absorption performance is good. Advanced Institute of Science and Technology research has found that the absorption rate of ferrite absorbing materials with a thickness of 2mm and a surface density of 5kg/m2 is greater than 10dB in the frequency range of 8-18GHz. In addition, Advanced Institute Technology also studied the effect of different particle sizes of Fe3O4 on electromagnetic wave absorption efficiency, and the results showed that the smaller the particle size of nanoscale Fe3O4, the higher the absorption efficiency. These results indicate that magnetic metal micro powders have good absorption performance in the frequency range of 8-12 GHz.
Overall, magnetic particle based absorbing materials exhibit excellent absorption performance in the frequency range of 8-12 GHz. Nano ferrite and
Magnetic metal micro powderThey are all important representatives. Through the action of different mechanisms, they can effectively absorb and dissipate incident electromagnetic waves, thereby achieving effective electromagnetic wave absorption. With the continuous development of technology and in-depth research, it is believed that magnetic particle based absorbing materials will play a greater role in scientific research and practical applications.
