Control of Domain Wall Position by Electrical Current in Structured Co/Ni Wire with Perpendicular Magnetic Anisotropy

TL;DR

This paper demonstrates precise control of domain wall positions in a structured Co/Ni wire with perpendicular magnetic anisotropy using electrical current pulses, achieving high velocities and potential for magnetic memory applications.

Contribution

It provides direct experimental evidence of current-driven domain wall manipulation in structured wires with notches, showing high precision and velocity.

Findings

Single current pulses can move domain walls between notches.

Domain walls reach velocities of 40 m/s.

Precise control of domain wall position is achievable.

Abstract

We report the direct observation of the current-driven domain wall (DW) motion by magnetic force microscopy in a structured Co/Ni wire with perpendicular magnetic anisotropy. The wire has notches to define the DW position. It is demonstrated that single current pulses can precisely control the DW position from notch to notch with high DW velocity of 40 m/s.