自旋轨道转矩的隐藏伙伴
Current-Driven Magnetization Switching via Zhang-Li Torque
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- Huazhong University of Science and Technology（华中科技大学）
- Hubei University（湖北大学）
- Southeast University（东南大学）
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中文总结 AI 辅助
该研究发现界面Dzyaloshinskii-Moriya相互作用存在时，Zhang-Li转矩可触发与自旋轨道转矩相似的磁化翻转，其或为SOT的重要互补机制，为SOT-MRAM器件设计提供指导。
中文摘要 AI 辅助
自旋轨道转矩（SOT）被广泛认为是电流驱动非磁/铁磁双层膜中磁化翻转的主要机制。本研究表明，在界面Dzyaloshinskii-Moriya相互作用（iDMI）存在时，作用于器件边界非均匀磁化的电流诱导自旋转移转矩（STT）——Zhang-Li转矩，可触发与SOT极为相似的翻转行为，包括场辅助确定性翻转和翻转极性控制。这些结果提示Zhang-Li转矩可能是SOT的重要互补机制，本研究拓宽了重金属/铁磁体（HM/FM）结构中翻转物理的视角，为SOT-MRAM器件设计提供了实用指导。
英文摘要
Current-driven magnetization switching is currently governed by two established mechanisms: the Slonczewski spin-transfer torque (STT) and the spin-orbit torque (SOT). Here we identify the Zhang-Li STT as a third mechanism that operates on a different physical footing. Using micromagnetic simulations, we show that the interfacial Dzyaloshinskii-Moriya interaction (iDMI) inevitably creates spatial magnetization gradients at device edges, enabling the Zhang-Li torque to drive deterministic, field-assisted switching that fully reproduces all hallmark behaviors of SOT, including polarity control and effective-field characteristics. Our work establishes the Zhang-Li torque as an autonomous switching pathway, redefining the physical picture of current-induced magnetization reversal and providing new design principles for spintronic devices.
