论文标题
手性旋转构型在无野外自旋轨道扭矩引起的磁化磁力化开关中的作用
Role of the chiral spin configuration in field-free spin-orbit torque-induced magnetization switching by a locally injected spin current
论文作者
论文摘要
对于垂直磁各向异性系统中自旋轨道扭矩（SOT）的确定性磁化切换，通过破坏磁化对称性来确定性切换至关重要。在磁性排序系统中实现手性可以是在横向方向上实现无场磁化切换的一种方法。但是，对手性自旋系统对确定性切换的影响的系统分析仍然很少。在本报告中，通过实验和微磁模拟研究了使用手性自旋构型通过使用手性自旋构型实现无现场SOT诱导的磁化。我们设计了一个系统，在该系统中，铁磁层的一部分与PT/CO/MGO结构中的重金属层重叠。因此，仅在铁磁层的局部区域施加旋转电流，这导致了néel型手性自旋构型。诱导的手性自旋构型可以根据系统的界面dzyaloshinskii-moriya相互作用的迹象稳定（或不稳定）。稳定的自旋构型在零场的确定性切换中起着至关重要的作用。我们希望我们的发现能够扩大基于手性的全电SOT设备制造的观点。
For deterministic magnetization switching by spin-orbit torque (SOT) in a perpendicular magnetic anisotropy system, an additional in-plane direction magnetic field is essential for deterministic switching by breaking the magnetization symmetry. Realizing chirality in a magnetic ordering system can be one approach for achieving asymmetry in the lateral direction for field-free magnetization switching. However, systematic analysis of the influence of the chiral spin system on deterministic switching is still scarce. In this report, the achievement of field-free SOT-induced magnetization switching by using a chiral spin configuration is investigated by experiments and micromagnetic simulations. We designed a system in which only part of the ferromagnetic layer overlaps with the heavy metal layer in the Pt/Co/MgO structure. Therefore, a spin current is exerted only on a local area of the ferromagnetic layer, which results in a Néel-type chiral spin configuration. The induced chiral spin configuration can be stabilized (or destabilized) depending on the sign of the interfacial Dzyaloshinskii-Moriya interaction of the system. The stabilized spin configuration plays a crucial role in the deterministic switching in zero field. We expect our findings to widen the perspective on chirality-based all-electrical SOT device fabrication.
