Ultralow Power and Shifting-Discretized Magnetic Racetrack Memory Device Driven by Chirality Switching and Spin Current

Shen Li, Xiaoyang Lin (Corresponding author), Pingzhi Li, Suteng Zhao, Zhizhong Si, Guodong Wei, Bert Koopmans, Reinoud Lavrijsen, Weisheng Zhao

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
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Abstract

Magnetic racetrack memory has significantly evolved and developed since its first experimental verification and is considered one of the most promising candidates for future high-density on-chip solid-state memory. However, both the lack of a fast and precise magnetic domain wall (DW) shifting mechanism and the required extremely high DW motion (DWM) driving current make the racetrack difficult to commercialize. Here, we propose a method for coherent DWM that is free from the above issues, which is driven by chirality switching (CS) and an ultralow spin-orbit-torque (SOT) current. The CS, as the driving force of DWM, is achieved by the sign change of the Dzyaloshinskii-Moriya interaction, which is further induced by a ferroelectric switching voltage. The SOT is used to break the symmetry when the magnetic moment is rotated in the Bloch direction. We numerically investigate the underlying principle and the effect of key parameters on the DWM by micromagnetic simulations. Under the CS mechanism, a fast (∼102 m/s), ultralow energy (∼5 attoJoule), and precisely discretized DWM can be achieved. Considering that skyrmions with topological protection and smaller size are also promising for future racetracks, we similarly evaluate the feasibility of applying such a CS mechanism to a skyrmion. However, we find that the CS causes it to “breathe” instead of moving. Our results demonstrate that the CS strategy is suitable for future DW racetrack memory with ultralow power consumption and discretized DWM.

Original languageEnglish
Pages (from-to)39946-39955
Number of pages10
JournalACS Applied Materials and Interfaces
Volume15
Issue number33
DOIs
Publication statusPublished - 23 Aug 2023

Bibliographical note

Funding Information:
This work was supported in part by the Beijing Natural Science Foundation (No. 4232070), the National Natural Science Foundation of China (Nos. 51602013 and 52261145694), the International Mobility Project (No. B16001), the China Scholarship Council (CSC), and the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 860060.

Publisher Copyright:
© 2023 American Chemical Society.

Keywords

  • chirality switching
  • domain wall motion
  • Dzyaloshinskii−Moriya interaction
  • racetrack memory
  • ultralow power

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