Electric Control of Multiple Domain Walls in Pt/Co/Pt Nanotrack with Perpendicular Magnetic Anisotropy

TL;DR

This paper demonstrates electric control of multiple domain walls in Pt/Co/Pt nanotracks with perpendicular magnetic anisotropy, enabling low-current, room-temperature, simultaneous DW manipulation for potential data storage applications.

Contribution

It introduces a method for controlling multiple domain walls simultaneously using electric currents in nanotracks with perpendicular magnetic anisotropy, a novel approach for multi-bit data manipulation.

Findings

Multiple DWs can be displaced simultaneously and identically.

Purely current-driven DW motion achieved at low current densities.

Successful demonstration of four-bit shift register prototype.

Abstract

Electric control of multiple domain walls (DWs) motion is demonstrated by Pt/Co/Pt nanotracks with perpendicular magnetic anisotropy. Due to the weak microstructural disorders with small DW propagation field, the purely current-driven DW motion is achieved in the creep regime at current densities less than 10^7 A/cm^2 at room temperature. It is confirmed that by use of a scanning magneto-optical Kerr effect microscope, several DWs are simultaneously and identically displaced by the same distance in the same direction. Utilizing such DWs motion, we succeed to realize random bits writing and transferring as a device prototype of four-bit shift registers.