Magnetic nanowires are of technological importance as their magnetic properties can be controlled by their dimensions and shape. In soft magnetic nanowires (e.g. Ni 80 Fe 20 alloy or Permalloy), shape anisotropy has a very strong effect on their magnetic properties and thus the wire width and thickness control the domain patterns, nature of magnetization reversal, and the switching field. The switching field of a permalloy (Py) nanowire (NW) can be reduced substantially by attaching a microsized nucleation pad (NPD) to it. In this work, the OOMMF software package was used to perform micromagnetic simulations for selected NPD-NW structures. In this present study, we proved that the shape of the attached NPD is an important factor to consider. For instance, the switching field of structure comprises a triangular NPD (area = 0.25 μm²) with its head connected to a Py NW (20 nm wide) is about one fourth of the switching field of a square-like NPD-NW structure of the same size. Also the NPD size has an effect on the quality of the obtained hysteresis loop and thus it has to be comparable to the size of the NW for the sake of having a step-free hysteresis loop. These findings suggest that the rectangular NPD with its head connected to the NW may serve better than other shapes as it provides a directed motion for the domain walls to reach the NPD/NW interface easily. Thus it gives the highest reduction in the switching field of the Py nanowire in addition to a step-free hysteresis loop when the NPD size is 0.01 μm².

磁性纳米线具有技术重要性，因为其磁性可以通过其尺寸和形状来控制。在软磁纳米线（例如Ni 80 Fe 20合金或坡莫合金）中，形状各向异性对其磁性能有非常强的影响，因此，线的宽度和厚度控制着磁畴图案，磁化反转的性质以及开关场。坡莫合金（Py）纳米线（NW）的开关场可以通过在其上附加一个微型成核垫（NPD）来大大减小。在这项工作中，使用OOMMF软件包对选定的NPD-NW结构进行了微磁仿真。在本研究中，我们证明了附着的NPD的形状是要考虑的重要因素。例如，结构的切换场包括三角形NPD（面积= 0.25μm²）其头部连接到Py NW（宽20 nm），大约是相同大小的正方形NPD-NW结构的开关场的四分之一。另外，NPD的大小对获得的磁滞回线的质量有影响，因此为了具有无级磁滞回线，它必须与NW的大小相当。这些发现表明，其头部连接到NW的矩形NPD可能比其他形状更好，因为它为畴壁轻松地到达NPD / NW界面提供了定向运动。因此，它提供了除一个无台阶的磁滞回线在纳米线PY的转换场的最高减少当NPD大小为0.01μm ²。