Epsilon iron oxide absorbs electromagnetic waves of the 6G band.

"Consecutive manufacturing process of epsilon iron oxide. Credit: Korea Institute of Materials Science (KIMS)" (Scitechdaily.com/Millimeter Wave-Absorbing Magnetic Materials: Tech To Absorb Electromagnetic Waves in the 6G Band)

The new epsilon iron oxide-based material can absorb millimeter-class radiation. The ability to absorb 6G radiation makes it possible to protect computers against 6G network radiation. But the ability to absorb the 6G network's radiation makes it possible to protect those networks against attacks at least if the 6G network operates as LAN (Local Area Network). In this type of case, developers put absorption material in the house's walls. 

That denies the attacker to see the network's data traffic from outside. And the system can control access points better than if the attacker can see the network from outside. There are possibly only a couple of points where the data travels in and out of the house. Epsilon iron oxide can play a key role in aimed electromagnetic communication. 

Iron III oxide molecule model. (Wikipedia/Iron (III) oxide)

If the radio maser or 6G transmitter-receiving station is covered by using the box. If that box's walls are filled by using epsilon iron oxide. That allows denying the stray radiation. That makes it more difficult to see the radiation source from the sides. The radiation-absorbing materials can also use for EM-protecting spaces. 

Those EM-protecting spaces are needed in microchip technology. Also, electromagnetic protection makes it possible to control things like electromagnetic fields inside the assembly lines. That system also protects rooms against eavesdropping. 

"Scheme of ε-Fe2O3 structure. Polyhedral distribution of the ε-Fe2O3 structure obtained by theoretical simulations. Fe(1)O6 unit is plotted in light blue, Fe(2)O6 unit in dark blue, Fe(3)O6 unit in red, and Fe(4)O4 unit in green" (Nature.com/Stability and nature of the volume collapse of ε-Fe2O3 under extreme conditions)

The 6G absorbing material can be a new pathfinder in stealth technology. The same technology used for absorbing the 6G radio frequencies can use to absorb all similar wavelengths. That thing makes the epsilon iron oxide useful in stealth structures. The ability to absorb radiation makes it possible to create structures, that are invisible to the radar. 

"The epsilon (ε) phase of iron (III) oxide is rhombic, and shows properties intermediate between alpha and gamma, and may have useful magnetic properties applicable for purposes such as high-density recording media for big data storage." (Wikipedia/ Iron (III) oxide). That makes it possible to use as an antenna. And the epsilon iron oxide can also use to store radar impulses. That is touching the surface of stealth aircraft. 

The radar-absorbing materials, or RAM materials, are one of the most promising things in stealth technology. Of course, the shape of the plane and plasma layers along with counter waves can make aircraft invisible to radar. But combining those technologies makes sure that the system operates as it should. 

https://ceramics.org/ceramic-tech-today/processing-1/materials-for-6g-technology-scientists-refine-synthesis-of-rare-iron-oxide-phase

https://www.nature.com/articles/s41467-018-06966-9

https://en.wikipedia.org/wiki/Iron(III)_oxide

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