Effective Manipulation of Skyrmions via Strain Gradient

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Skyrmions are crucial for next-generation memory, logic, and sensing.
• Strain engineering is an energy-efficient method to control skyrmion properties.
• Excessive uniform strain can cause material failure, limiting device reliability.

Purpose of the Study:

• To explore strain gradients as a novel control parameter for skyrmions.
• To investigate the impact of microscale wrinkled structures on skyrmion characteristics.
• To demonstrate a practical and robust method for skyrmion engineering.

Main Methods:

• Fabrication of Pt/Co/Ta multilayers with microscale periodic wrinkled structures.
• Generation of controlled strain gradients across the magnetic films.
• Characterization using magnetic force microscopy and micromagnetic simulations.

Main Results:

• Skyrmion density and size were found to vary synchronously with the in-plane strain gradient.
• Strain gradients provide broader tunability compared to uniform strain.
• Micromagnetic simulations confirmed strain-induced modulation of Dzyaloshinskii-Moriya interaction and magnetic anisotropy.

Conclusions:

• Strain gradients offer an effective and tunable method for precise skyrmion control.
• This approach is reversible, cyclable, and transferable across different magnetic multilayers.
• The findings pave the way for advanced flexible spintronics, skyrmion memory, and neuromorphic computing.