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Related Experiment Video

Updated: Jul 19, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Ultralow Power and Shifting-Discretized Magnetic Racetrack Memory Device Driven by Chirality Switching and Spin

Shen Li1,2,3, Xiaoyang Lin1,3, Pingzhi Li2

  • 1School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China.

ACS Applied Materials & Interfaces
|August 15, 2023
PubMed
Summary
This summary is machine-generated.

Chirality switching (CS) enables fast and precise magnetic domain wall motion for racetrack memory, overcoming commercialization hurdles. This ultralow energy method offers a promising path for next-generation solid-state memory devices.

Keywords:
Dzyaloshinskii−Moriya interactionchirality switchingdomain wall motionracetrack memoryultralow power

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Area of Science:

  • Spintronics
  • Materials Science
  • Solid-State Physics

Background:

  • Magnetic racetrack memory is a leading candidate for high-density solid-state storage.
  • Current methods for magnetic domain wall motion (DWM) face challenges with speed, precision, and high current requirements, hindering commercialization.

Purpose of the Study:

  • To propose and investigate a novel, efficient mechanism for coherent DWM.
  • To address limitations of existing DWM techniques for racetrack memory applications.

Main Methods:

  • Utilized micromagnetic simulations to explore a DWM mechanism driven by chirality switching (CS).
  • Investigated the role of Dzyaloshinskii-Moriya interaction modulation via ferroelectric voltage and spin-orbit-torque (SOT) current.

Main Results:

  • Demonstrated a fast (∼10^2 m/s), ultralow energy (∼5 attoJoule) DWM driven by CS.
  • Achieved precisely discretized DWM, overcoming key commercialization barriers.
  • Found CS induces skyrmion breathing rather than motion, indicating limitations for skyrmion-based approaches.

Conclusions:

  • The proposed CS strategy is effective for DWM in racetrack memory, offering ultralow power consumption and precise control.
  • This method presents a viable solution for advancing racetrack memory technology.
  • CS is not suitable for driving skyrmion motion in racetrack memory.