Spontaneous magnons synchronize with external signals at room temperature
Signals ride on waves of one kind or another: light, sound, radio. But new carriers are needed to relay information in next-generation devices. Disturbances or waves in magnetic materials called magnons could be an efficient option—if scientists can tame them.
Scientists from the U.S. Department of Energy's Argonne National Laboratory and the University of Illinois Urbana-Champaign have developed a method to generate self-sustaining magnons in a material called yttrium iron garnet (YIG) that can be synchronized with external signals at room temperature. This discovery, reported in Nature Communications, could pave the way for more efficient next-generation microelectronics, wireless communication, and quantum information processing devices.
The team achieved this by using a technique called parametric pumping, which involves timing the motion of a person on a swing with the swing's natural rhythm to add energy without an external push. In this case, the "swing" is the magnons in the YIG thin film, and the "person" is a pair of microwave antennas on the film. By controlling the generation of spontaneous oscillations with extreme precision, the researchers created ultrasharp waves that can be tuned to an external signal, much like two metronomes falling into the same rhythm when placed on the same surface.
This breakthrough has potential applications in low-power microwave signal processing and future computing architectures, including hybrid magnonic quantum circuits.
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