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<p>Two-dimensional quantum material heterostructures can offer a promising platform for energy-efficient non-volatile spin-based technologies. However, spin dynamics experiments to understand the basic spin-orbit torque phenomena are so far lacking. Here, we demonstrate unconventional out-of-plane magnetization dynamics, and energy-efficient and field-free spin-orbit torque switching in a van der Waals heterostructure comprising out-of-plane magnet Fe<sub>3</sub>GaTe<sub>2</sub> and topological Weyl semimetal TaIrTe<sub>4</sub>. We measured non-linear second harmonic Hall signal in TaIrTe<sub>4</sub>/Fe<sub>3</sub>GaTe<sub>2</sub> devices to evaluate the magnetization dynamics, which is characterized by large and tunable out-of-plane damping-like torque. Energy-efficient and deterministic field-free SOT magnetization switching is achieved at room temperature with a very low current density. First-principles calculations unveil the origin of the unconventional charge-spin conversion phenomena, considering the crystal symmetry and electronic structure of TaIrTe<sub>4</sub>. These results establish that van der Waals heterostructures provide a promising route to energy-efficient, field-free, and tunable spintronic devices.</p>

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Tunable unconventional spin orbit torque magnetization dynamics in van der Waals heterostructures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • Lalit Pandey,
  • Bing Zhao,
  • Karma Tenzin,
  • Roselle Ngaloy,
  • Veronika Lamparská,
  • Himanshu Bangar,
  • Aya Ali,
  • Mahmoud Abdel-Hafiez,
  • Gaojie Zhang,
  • Hao Wu,
  • Haixin Chang,
  • Lars Sjöström,
  • Prasanna Rout,
  • Jagoda Sławińska,
  • Saroj P. Dash

摘要

Two-dimensional quantum material heterostructures can offer a promising platform for energy-efficient non-volatile spin-based technologies. However, spin dynamics experiments to understand the basic spin-orbit torque phenomena are so far lacking. Here, we demonstrate unconventional out-of-plane magnetization dynamics, and energy-efficient and field-free spin-orbit torque switching in a van der Waals heterostructure comprising out-of-plane magnet Fe3GaTe2 and topological Weyl semimetal TaIrTe4. We measured non-linear second harmonic Hall signal in TaIrTe4/Fe3GaTe2 devices to evaluate the magnetization dynamics, which is characterized by large and tunable out-of-plane damping-like torque. Energy-efficient and deterministic field-free SOT magnetization switching is achieved at room temperature with a very low current density. First-principles calculations unveil the origin of the unconventional charge-spin conversion phenomena, considering the crystal symmetry and electronic structure of TaIrTe4. These results establish that van der Waals heterostructures provide a promising route to energy-efficient, field-free, and tunable spintronic devices.