Standalone Integrated Magnonic Devices.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40697028.
- Also identified by DOI 10.1002/adma.202503493 and PMC identifier 12510288.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
In the race toward "beyond 6G" telecommunication platforms, magnonics emerges as a promising solution. To date, however, the requirement for bulky external sources of the magnetic bias field necessary for spin wave propagation has constituted a significant bottleneck, impeding the integration of magnonic devices into RF systems. Here, the first demonstration is presented of a standalone and tunable magnonic device featuring all-electric input and output, fully integrated on a silicon substrate, with a compact footprint of 100 × 150 µm<sup>2</sup>. The device consists of a CoFeB waveguide equipped with two radio frequency antennas, flanked by a symmetric configuration of magnetic flux concentrators and SmCo permanent micromagnets. By varying the distance D between the flux concentrators and the permanent magnets from 0 to 12 µm, the transverse bias field can be tuned from 20.5 to 11 mT, respectively. This variation directly modulates the dispersion relation of Damon-Eshbach spin wave modes in the CoFeB waveguide. In the proof-of-concept devices, the spin wave frequency band ranges from 3 to 8 GHz, with precise tuning of the phase shift up to 120 deg at 6 GHz. The operational frequency band can be easily pushed to higher frequencies through micromagnet engineering.