反常霍尔信号对各向异性磁电阻的调制及其在壁面速度实时测量中的应用
Modulation of anisotropic magnetoresistance by anomalous Hall signal and its application to real-time domain wall velocity measurement
摘要：
本文提出了一种利用反常霍尔信号调制各向异性磁电阻（AMR），从而测量近场畴壁运动速度的方法。我们研究了纵向（Rxx）霍尔几何中恒定磁场下的磁化弛豫。我们观察到不对称的Rxx峰出现在DW钉扎领域。这种不寻常的磁阻行为解释考虑AMR调制的异常霍尔电压。在所提出的方法中，使用磁化弛豫，DW速度的实时测量是比较容易的其他显微镜方法。此外，来自异常霍尔电压的附加信号使得该技术对于DW速度测量更简单和灵敏，这可以用于各种自旋电子传感应用。
英文摘要：
We present here a way to modulate the anisotropic magnetoresistance (AMR) by anomalous Hall signal and thus measure the domain wall (DW) motion velocity at near-coercivity. We study the magnetization relaxation at the constant field in the longitudinal (Rxx) Hall geometry. We observed asymmetric Rxx peaks that appear at the DW pinning fields. This unusual magnetoresistance behavior is explained by considering the AMR modulation by the anomalous Hall voltage. In the proposed method, using the magnetization relaxation, the real-time DW velocity measurement is much easier in comparison to the other microscopy methods. Moreover, the additional signal from anomalous Hall voltage makes this technique simpler and sensitive for DW velocity measurements, which can be useful for various spintronic sensing applications.
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