Standalone Integrated Magnonic Devices

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Magnonics offers potential for beyond 6G telecommunication platforms.
• External magnetic bias fields for spin wave propagation are a major bottleneck for integrating magnonic devices into RF systems.

Purpose of the Study:

• To demonstrate the first standalone, tunable magnonic device with all-electric input/output.
• To integrate a magnonic device onto a silicon substrate with a compact footprint.

Main Methods:

• Fabrication of a CoFeB waveguide with RF antennas, flux concentrators, and SmCo permanent micromagnets.
• Tuning the transverse bias field by adjusting the distance between flux concentrators and permanent magnets (0-12 µm).
• Modulation of Damon-Eshbach spin wave modes and their dispersion relation.

Main Results:

• Achieved a compact device (100 × 150 µm²) with tunable bias field (11-20.5 mT).
• Demonstrated spin wave frequency band from 3 to 8 GHz.
• Precise tuning of phase shift up to 120 degrees at 6 GHz.

Conclusions:

• The developed device overcomes the need for bulky external magnetic fields.
• The compact, tunable magnonic device is suitable for integration into RF systems for beyond 6G applications.
• Operational frequency can be extended via micromagnet engineering.