Hexagonal ferrite absorbing materials: a new chapter in electromagnetic shielding

In today's rapidly developing technology, electromagnetic waves have become an indispensable part of people's daily lives. However, with the continuous advancement of communication technology, the problem of electromagnetic wave pollution has become increasingly prominent. Electromagnetic wave shielding andAbsorberThe research is particularly crucial. Among them, hexagonal ferrite absorbing materials are gradually becoming a research hotspot due to their unique properties and wide application prospects.

1、 Performance advantages of hexagonal ferrite absorbing materials

Hexagonal ferrite is a type of material with excellent magnetic properties, and its high magnetic crystal anisotropy enables it to break through the limitations of traditional materials and achieve effective absorption of high-frequency electromagnetic waves. In the GHz frequency band, hexagonal ferrite exhibits high magnetic permeability and low loss characteristics, making it an ideal material for high-frequency electromagnetic fields. In addition, hexagonal ferrites also exhibit room temperature multiferroicity, where the coexistence of ferroelectric and magnetic ordering leads to a synergistic effect of electrical and magnetic losses, enhancing the material's ability to absorb waves.

2、 Research progress of hexagonal ferrite absorbing materials

In recent years, scholars at home and abroad have conducted extensive and in-depth research on hexagonal ferrite absorbing materials. On the one hand, researchers adjust the electromagnetic parameters of materials and optimize their absorption performance by using ion substitution doping. For example, after co doping with transition metal ions at the Co site, the electromagnetic parameters of Co2Z hexagonal ferrite are effectively controlled, and the reflection loss is significantly improved. On the other hand, the researchers also optimized the preparation process of materials and improved the performance stability of materials by changing the process conditions, such as the use of sol gel method, one-time calcination and two-part heat treatment.

In terms of material preparation, researchers have successfully prepared hexagonal ferrite absorbing material samples with a thickness of 2mm and a surface density of 5kg/m2. The absorption rate of this sample is greater than 10dB in the frequency range of 8-18GHz, demonstrating a wide operating frequency band and excellent absorption performance. In addition, the particle specific surface area of nano ferrite is large, and the surface atomic band structure is different from that in the body, which makes hexagonal ferrite absorbing materials have high coercivity and further enhances their absorbing effect.

3、 Application prospects of hexagonal ferrite absorbing materials

Hexagonal ferrite absorbing materials have broad application prospects in fields such as electromagnetic shielding, stealth technology, and wireless communication. In terms of electromagnetic shielding, hexagonal ferrite absorbing materials can effectively absorb and attenuate electromagnetic waves, reduce the harm of electromagnetic radiation to the human body, and improve the stability and reliability of electronic devices. In terms of stealth technology, hexagonal ferrite absorbing materials can be used as stealth coatings for weapon systems such as aircraft and warships, reducing the effective area of radar search and interception and improving the survivability of weapons. In the field of wireless communication, hexagonal ferrite absorbing materials can be used to suppress electromagnetic wave interference between wireless communication devices and improve communication quality.

conclusion

Hexagonal ferrite absorbing materialAs an electromagnetic shielding material with excellent performance and wide application prospects, it is gradually becoming a hot topic in the field of scientific research. With the continuous deepening of research and the advancement of technology, it is believed that hexagonal ferrite absorbing materials will play a more important role in the field of electromagnetic wave shielding and absorption in the future, creating a safer, more efficient, and convenient electromagnetic environment for humanity.