Dispersion-tunable low-loss implanted spin-wave waveguides for large magnonic networks

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Magnonic networks offer energy-efficient information processing potential.
• Current spin-wave waveguides face limitations in propagation length and dispersion tuning.
• Yttrium iron garnet (YIG) is a promising material for magnonic devices.

Purpose of the Study:

• To realize low-loss spin-wave waveguides in yttrium iron garnet (YIG) thin films.
• To overcome limitations of existing waveguide fabrication methods.
• To demonstrate the potential for large-scale magnonic integrated circuits.

Main Methods:

• Utilized silicon ion implantation to create amorphous waveguide cladding in YIG films.
• Fabricated submicrometre waveguides using a maskless ion implantation technique.
• Measured spin-wave propagation lengths and characterized waveguide dispersion.

Main Results:

• Achieved spin-wave decay lengths exceeding 100 micrometers in submicrometre waveguides.
• Demonstrated continuous and localized tuning of waveguide dispersion via ion implantation.
• Successfully fabricated a large-scale magnonic network with 198 crossings.

Conclusions:

• Silicon ion implantation is an effective method for creating high-performance magnonic waveguides.
• The developed waveguides overcome key limitations, enabling efficient spin-wave propagation and tunability.
• This work paves the way for wafer-scale integration of magnonic circuits for advanced computing.