Control of spin-wave transmission by a programmable domain wall

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Spin waves are crucial for developing advanced magnonic technologies.
• Controlling spin waves requires precise manipulation of magnetic structures.

Purpose of the Study:

• To demonstrate programmable spin-wave filtering using engineered magnetic domain walls.
• To investigate the impact of domain wall configurations on spin-wave propagation.

Main Methods:

• Utilized micro-focused Brillouin light scattering for experimental analysis.
• Employed micromagnetic simulations to model spin-wave behavior.
• Engineered pinned 90° Néel domain walls in CoFeB films by manipulating magnetic anisotropy.

Main Results:

• Broad domain walls (head-to-head/tail-to-tail) are transparent to spin waves.
• Narrow domain walls (head-to-tail) strongly reflect spin waves.
• Demonstrated a spin-wave valve switching transmission from 100% to 0%.

Conclusions:

• Programmable domain walls offer active control over spin-wave transport.
• This control is achievable by reconfiguring domain wall spin structures.
• Potential applications include magnonic logic devices and non-volatile memory.