Domain Wall Automotion in Three-Dimensional Magnetic Helical Interconnectors

Area of Science:

• Spintronics and Nanotechnology
• Materials Science and Engineering

Background:

• Traditional CMOS technology faces fundamental limits in information processing.
• Novel approaches for information storage, computation, and transmission are crucial.
• Exploring beyond CMOS requires innovative materials and device architectures.

Purpose of the Study:

• To propose and prototype a 3D magnetic interconnector for efficient information transfer.
• To investigate the mechanism of geometry-driven automotion of magnetic domain walls (DWs) in 3D structures.
• To demonstrate a pathway for magnetic information transfer in three dimensions.

Main Methods:

• Fabrication of 3D helical DW conduits using 3D nanoprinting and physical vapor deposition.
• Experimental observation of DW automotion using X-ray microscopy under varying magnetic fields.
• Micromagnetic simulations to analyze DW motion mechanisms and energy landscapes.

Main Results:

• Observed robust, unidirectional automotion of DWs in 3D helical conduits.
• Identified large thickness gradients as the primary driver for 3D DW automotion.
• Demonstrated tailorable magnetic energy gradients and their competition with pinning effects.
• Predicted high DW velocities approaching the Walker limit.

Conclusions:

• 3D magnetic interconnectors exploiting geometry-driven DW automotion offer a novel approach for information transfer.
• Thickness gradients in 3D nanostructures are key to controlling DW motion.
• This technology shows potential for efficient 3D magnetic information transfer, advancing beyond CMOS limitations.