论文标题
磁不对称诱导IRMN中的异常自旋轨道扭矩
Magnetic asymmetry induced anomalous spin-orbit torque in IrMn
论文作者
论文摘要
我们证明了由抗铁磁体IRMN中断裂的磁对称诱导的异常自旋轨道扭矩。我们使用中子衍射技术研究了IRMN薄膜的三个阶段的磁结构。在L10-IRMN和L12-IRMN3中，磁性镜子对称性M'横向断裂，而不是γ-IRMN3。我们观察到L10-IRMN/Permny和L12-Irmn3/Permalloy Bilayers中的平面外阻尼状旋转轨道扭矩，但在γ-IRMN3/Permalloy中均未。这与对称分解对旋转轨道扭矩的影响的对称分析以及自旋霍尔效应的理论预测和Rashba-Edelstein效应的影响是一致的。此外，对于L10，L12和γ相，测得的自旋轨道扭矩效率分别为0.61+-0.01、1.01+-0.03和0.80+-0.01。我们的工作突出了磁不对称在自旋轨道扭矩产生中的关键作用。
We demonstrate an anomalous spin-orbit torque induced by the broken magnetic symmetry in the antiferromagnet IrMn. We study the magnetic structure of three phases of IrMn thin films using neutron diffraction technique. The magnetic mirror symmetry M' is broken laterally in both L10-IrMn and L12-IrMn3 but not γ-IrMn3. We observe an out-of-plane damping-like spin-orbit torque in both L10-IrMn/permalloy and L12-IrMn3/permalloy bilayers but not in γ-IrMn3/permalloy. This is consistent with both the symmetry analysis on the effects of a broken M' on spin-orbit torque and the theoretical predictions of the spin Hall effect and the Rashba-Edelstein effect. In addition, the measured spin-orbit torque efficiencies are 0.61+-0.01, 1.01+-0.03 and 0.80+-0.01 for the L10, L12 and γ phases, respectively. Our work highlights the critical roles of the magnetic asymmetry in spin-orbit torque generation.
