Chiral Symmetry Breaking for Deterministic Switching of Perpendicular Magnetization by Spin-Orbit Torque

Hao Wu, John Nance, Seyed Armin Razavi, David Lujan, Bingqian Dai, Yuxiang Liu, Haoran He, Baoshan Cui, Di Wu, Kin Wong, Kemal Sobotkiewich, Xiaoqin Li, Gregory P. Carman, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Symmetry breaking is a characteristic to determine which branch of a bifurcation system follows upon crossing a critical point. Specifically, in spin-orbit torque (SOT) devices, a fundamental question arises: How can the symmetry of the perpendicular magnetic moment be broken by the in-plane spin polarization? Here, we show that the chiral symmetry breaking by the antisymmetric Dzyaloshinskii-Moriya interaction (DMI) can induce the deterministic SOT switching of the perpendicular magnetization. By introducing a gradient of saturation magnetization or magnetic anisotropy, the dynamic noncollinear spin textures are formed under the current-driven SOT, and thus, the chiral symmetry of these dynamic spin textures is broken by the DMI, resulting in the deterministic magnetization switching. We introduce a strategy to induce an out-of-plane (z) gradient of magnetic properties as a practical solution for the wafer-scale manufacture of SOT devices.

Original languageEnglish
Pages (from-to)515-521
Number of pages7
JournalNano letters
Volume21
Issue number1
DOIs
Publication statusPublished - 2021 Jan 13

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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