Propagation of spin waves through a Néel domain wall

界面电荷积累对Pt/Co/Pt/Al2O3结构磁畴壁形核和扩展的影响

Interfacial charge accumulation effect on magnetic domain wall nucleation and propagation in a Pt/Co/Pt/Al2O3 structure

本文报道了在具有垂直各向异性的Pt/Co（0.5 nm）/Pt（0.5 nm）/Al_2O_3结构中直接观察到的电荷积累效应对磁化反转的影响。通过对磁畴的极向克尔显微镜成像，我们发现Pt/Al_2 O_3界面上正电荷的积累有利于磁畴壁的扩展，而负电荷则阻碍畴壁的成核和扩展。我们的研究结果表明，在Co层的磁性可以强烈地影响由5d电子积累/耗尽在一个cnPt层。

磁畴壁传感器器件中畴壁传播和成核场的几何依赖性

Geometrical dependence of domain wall propagation and nucleation fields in magnetic domain wall sensor devices

我们研究了用于畴壁传感器的分段纳米线环基结构中的关键畴壁特性。利用磁光克尔效应（MOKE）和巨磁电阻效应（GMR）测量方法，对器件失效的两个原因，即畴壁传播场（退钉扎）和成核场的分布进行了研究，得到了有意义的统计数据。沉积Ni $_{81}$ Fe $_{19}$的单层、具有Co $_{90}$ Fe $_{10}$ /Ni $_{81}$ Fe $_{19}$作为自由层的完整GMR叠层和Co $_{90}$ Fe $_{10}$的单层，并在工业上图案化，以确定形状各向异性、磁晶各向异性和制造工艺的影响。我们表明，传播场的几何形状的影响很小，但显着的材料参数。磁畴壁形核场可以用与测量的线的几何参数相关的典型Stoner-Wohlfarth模型来描述，并通过考虑工艺参数来拟合。随后在大量器件（3000）中测量GMR效应，以便精确地测量器件之间的变化。这揭示了传感器的成核场的校正上限，其可用于工作元件的快速表征。

Asymmetric velocity and tilt angle of domain walls induced by spin-orbit torques

We present a micromagnetic study of the current-induced domain wall motion in perpendicularly magnetized Pt/Co/AlOx racetracks. We show that the domain wall velocity depends critically on the tilt angle of the wall relative to the current direction, which is determined by the combined action of the Dzyaloshinskii-Moriya interaction, damping-like, and field-like spin-orbit torques. The asymmetry of the domain wall velocity can be controlled by applying a bias-field perpendicular to the current direction as well as by the current amplitude. As the faster domain walls are expelled rapidly from th…

磁振子带隙可调控的人工畴壁波导

Magnon-bandgap controllable artificial domain wall waveguide

本文通过微磁学模拟提出人工畴壁波导，发现其磁振子带隙可由有效交换场、宽度和磁各向异性调控，且结构稳定性优于自然畴壁波导，可用于磁振子频率滤波器。

Topological damping Rashba spin orbit torque in ballistic magnetic domain walls

Rashba spin orbit torque derived from the broken inversion symmetry at ferromagnet/heavy metal interfaces has potential application in spintronic devices. In conventional description of the precessional and damping components of the Rashba spin orbit torque in magnetization textures, the decomposition coefficients are assumed to be independent of the topology of the underlying structure. Contrary to this common wisdom, for Schrödinger electrons trespassing ballistically across a magnetic domain wall, we found that the decomposition coefficient of the damping component is determined by the topo…

铁磁金属/双金属双层膜中电流驱动的二次谐波畴壁共振：一种测量自旋霍尔角的无场方法

Current driven second harmonic domain wall resonance in ferromagnetic metal/ nonmagnetic metal bilayer: a field-free method for spin Hall angle measurements

研究了交流电流驱动的双层铁磁金属（FM）/双金属（NM）纳米线中的畴壁运动。用包含所有自旋转移力矩的修正Landau-Lifshitz-Gilbert方程的解描述了自旋霍尔效应存在时畴壁的运动。我们发现，除了已知的第一谐波激励的磁畴壁中心的第二谐波频率响应。与磁性薄膜中自旋-轨道转矩的谐波霍尔测量中实验观察到的二次谐波响应相反，该二次谐波响应直接源自自旋-轨道转矩驱动的畴壁动力学。基于由畴壁动力学产生的自旋电流，确定跨纳米线长度的纵向自旋动力产生的电压。二次谐波响应引入了一种新的实用的无场和全电的方法来探测FM/NM双层结构的有效自旋霍尔角，可以应用于实验。我们的研究结果还表明，利用FM/NM双层结构的磁畴壁为基础的自旋力矩信号发生器和谐振器的能力。