非对称切口坡莫合金纳米线中的磁涡旋手征开关
Magnetic vortex chirality switching in Permalloy nanowires with asymmetric notches
摘要：
我们研究了单根坡莫合金纳米线中涡旋畴壁通过非对称三角形缺口的运动。我们已经测量了磁滞回线使用聚焦磁光克尔效应之前和之后的缺口，这允许探针超出缺口的顺时针（CW）和逆时针（CCW）的发生概率的墙在尾到尾（TT）和头到头（HH）的配置。我们目前的实验证据的手征翻转所提供的涡缺口相互作用。在低出射角的情况下，手性翻转的概率增加，并且在这里，在15 $^o$的最低角度的情况下，能量上有利的畴壁构型（对于TT为CCW或对于HH壁为CW）的传播概率为$\approx 75\%$。微磁学模拟揭示了手性反转动力学的细节。
英文摘要：
We have investigated the motion of vortex domain walls passing across non symmetric triangular notches in single Permalloy nanowires. We have measured hysteresis cycles using the focused magneto-optical Kerr effect before and beyond the notch, which allowed to probe beyond the notch the occurrence probability of clockwise (CW) and counter-clockwise (CCW) walls in tail-to-tail (TT) and head-to-head (HH) configurations. We present experimental evidence of chirality flipping provided by the vortex -- notch interaction. With a low exit angle the probability of chirality flipping increases and here with the lowest angle of 15$^o$ the probability of propagation of the energetically favored domain wall configuration (CCW for TT or CW for HH walls) is $\approx 75\%$. Micromagnetic simulations reveal details of the chirality reversal dynamics.
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