Using the phenomenon of magnetic springs, the researchers were able to fully suppress the movement of sound energy in one direction inside the material, which opens up the possibility of creating an «acoustic diode».
Devices called rectifiers are essential in the development of technology. The most famous are electronic diodes, transforming alternating current into a permanent, without which the electrification would be impossible. The team from the Japanese Institute of Physical and Chemical Research (Riken) found that sound waves can be controlled in the same way.
Studying the propagation of surface acoustic waves in the magnetic film, they observed their interaction with spin waves (perturbations in magnetic fields inside the material) by means of magnetic communication. This was the first experimental confirmation of such an influence since the assumption of its existence more than 40 years ago.
The team found that this interaction occurs simultaneously with a well-studied magnetoelastic bond, but with other intensity. When the magnetization of the sample rotated in the same direction as surface acoustic waves, their energy was transmitted to spin waves more efficiently, increasing the rotation of magnetization.
In fact, the researchers were able to identify the configuration of a unidirectional connection, in which only the energy of unidirectional waves could be transmitted to the rotation of magnetization. They also noticed that this effect of straightening was more pronounced when the material showed magnetic anisotropy.
According to scientists, in the future they intend to use these principles to create an «acoustic diode», in which sound energy will be transmitted only in one direction and blocked in another. Since this occurs on microwave frequencies, then such rectifiers can be used in 5G and other telecommunication technologies.
Recall that last year engineers created the first in the world
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