Resonant Domain Wall Dynamics in a Three-Dimensional Magnetic Nano Double Helix

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Three-dimensional (3D) magnetic nanostructures offer potential for novel phenomena like non-reciprocal dynamics.
• Experimental study of magnetization dynamics in complex 3D nanostructures is challenging.

Purpose of the Study:

• Investigate magnetization dynamics in 3D nanoprinted cobalt double-helix nanostructures.
• Explore the potential for engineering dynamic properties through geometry.

Main Methods:

• Utilized time-resolved X-ray microscopy with nanoscale spatial and picosecond temporal resolution.
• Performed micromagnetic simulations to analyze observed dynamics and predict higher-frequency modes.

Main Results:

• Observed dynamics of coupled domain walls within helices, identifying a clear resonant response.
• Confirmed resonance originates from harmonic oscillatory modes of coupled domain walls.
• Discovered that helix geometry can be systematically varied to engineer resonant modes.

Conclusions:

• Geometric control of magnetic resonance in 3D nanostructures offers an alternative to traditional tuning methods.
• Findings provide a pathway for programmable functionalities in 3D magnetic systems.
• Potential applications include information processing architectures based on tunable spin texture dynamics.