High velocity domain wall propagation using voltage controlled magnetic anisotropy

Area of Science:

• Spintronics
• Materials Science
• Nanotechnology

Background:

• Voltage-controlled magnetic anisotropy (VCMA) offers energy-efficient domain wall (DW) propagation.
• Existing VCMA methods are limited by nanowire length constraints for DW propagation.

Purpose of the Study:

• To propose and demonstrate a novel multiplexed gate electrode configuration for overcoming length limitations in DW propagation.
• To achieve high-velocity DW propagation without constraints on magnetic nanowire length.

Main Methods:

• Micromagnetic simulations were employed to demonstrate the multi-gate electrode configuration.
• Controllable voltages were applied to neighboring gate electrodes to create magnetic anisotropy gradients.
• Analysis of DW dynamics, including tilt and gate electrode orientation, was performed.

Main Results:

• The proposed multi-gate system enables DW propagation on magnetic nanowires without length constraints.
• Achieved DW velocities exceeding 300 m/s.
• Chevron-shaped gate electrodes and specific anisotropy region patterns (high-medium-low) optimize high-velocity, deterministic DW propagation.

Conclusions:

• Multiplexed gate electrodes provide a scalable solution for long-range, high-velocity DW propagation.
• The configuration overcomes the inherent length limitations of previous VCMA-based DW propagation methods.
• Optimized gate designs and anisotropy patterns are crucial for efficient and controlled DW motion.