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<p>Efficient electrical manipulation of domain walls is key to developing magnetic devices with fast switching capabilities and low energy consumption. Here we demonstrate Bloch-type domain wall velocities exceeding 1 km s<sup>−1</sup> in the single-layer ferrimagnetic spinel oxide NiCo<sub>2</sub>O<sub>4</sub> induced by spin-transfer torque at a current density of 2 × 10<sup>11 </sup>A m<sup>−2</sup>. This exceptional domain wall mobility is attributed to the combination of giant nonadiabatic spin-transfer torque, low magnetization, and high spin polarization. Additionally, we report a pronounced domain wall inertia effect in this ferrimagnet due to the large nonadiabaticity of the torque. The characteristic time for domain wall acceleration and deceleration is ~ 1 ns, shorter than that reported for typical ferromagnets. Our findings highlight the potential of spinel oxides as a promising platform for engineering high-performance domain wall devices that take advantage of ultrafast ferrimagnetic dynamics.</p>

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High-mobility inertial domain walls driven by spin-transfer torque in a ferrimagnetic spinel oxide

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月31日

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  • Mingxing Wu,
  • Shilei Ding,
  • Laura van Schie,
  • Shenghao Cai,
  • Yuhao Qiu,
  • Ao Du,
  • Alexander E. Kossak,
  • Rui Wu,
  • Christian L. Degen,
  • Xuegang Chen,
  • Pietro Gambardella

摘要

Efficient electrical manipulation of domain walls is key to developing magnetic devices with fast switching capabilities and low energy consumption. Here we demonstrate Bloch-type domain wall velocities exceeding 1 km s−1 in the single-layer ferrimagnetic spinel oxide NiCo2O4 induced by spin-transfer torque at a current density of 2 × 1011 A m−2. This exceptional domain wall mobility is attributed to the combination of giant nonadiabatic spin-transfer torque, low magnetization, and high spin polarization. Additionally, we report a pronounced domain wall inertia effect in this ferrimagnet due to the large nonadiabaticity of the torque. The characteristic time for domain wall acceleration and deceleration is ~ 1 ns, shorter than that reported for typical ferromagnets. Our findings highlight the potential of spinel oxides as a promising platform for engineering high-performance domain wall devices that take advantage of ultrafast ferrimagnetic dynamics.