Low-Loss Nanoscopic Spin-Wave Guiding in Continuous Yttrium Iron Garnet Films

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Long-distance spin wave transport is crucial for integrated magnonic technology.
• Existing nano-waveguide methods face challenges with downscaling and require high magnetic fields.

Purpose of the Study:

• To introduce a novel waveguiding structure for efficient spin wave transport.
• To overcome limitations of current nano-waveguide designs.

Main Methods:

• Utilizing low-damping continuous yttrium iron garnet (YIG) films.
• Defining nanoscopic channels via dipolar coupling with ferromagnetic metal nanostripes.
• Investigating spin wave propagation in a hybrid material structure.

Main Results:

• Achieved long-distance spin wave transport with a decay length of ~20 μm in 160 nm wide waveguides.
• Demonstrated efficient spin wave guiding over a broad frequency range at low magnetic bias fields.
• Showcased redirection of spin waves using stray-field-induced bends.

Conclusions:

• The hybrid YIG/metal nanostripe structure offers a promising approach for low-loss spin wave guiding.
• Straightforward nanofabrication facilitates the development of magnonic integrated circuits.
• This method paves the way for advanced spin-wave computing applications.