Edge-soliton-meditated fast vortex core dynamic switching in a notched magnetic disk
Edge-soliton-meditated fast vortex core dynamic switching in a notched magnetic disk
复制标题
缺口磁盘中边孤子介导的快速涡核动态切换
DOI：
10.1016/j.jmmm.2018.11.067
复制
发表时间：
2018
影响因子：
2.7
通讯作者：
Wu Y Z
中科院分区：
文献类型：
--
作者：
Luo Y M;Zhou T J;Qian Z H;Xiao X;Liu Z T;Zhou C;Won C;Wu Y Z
磁涡的特征是面内磁化手征性和涡核的极性。寻找有效的方法来控制旋涡的极性和手性，对于高速、高密度的非易失性存储应用具有非常重要的基础和现实意义。在这里，我们报道了一种新的涡核(VC)开关过程，在缺口圆盘中，由脉冲场驱动。微磁模拟表明，边缘孤子在凹槽附近的动力学特性在开关过程中起着关键作用，从而导致了亚纳秒级的VC快速开关。给出了作为场强和持续时间的函数的切换图，以指示工作范围。进一步研究了平面外偏置场下的VC开关，证明了这种开关是确定性的，并且对磁场环境具有较强的鲁棒性。最后，通过施加谐振交变电场，观察到了一个周期性的VC开关，而开关场大大减小。研究结果表明，凹槽盘在基于VC的存储应用中具有很大的潜力。
Magnetic vortices are characterized by the sense of in-plane magnetization chirality and by the polarity of the vortex core. Searching for efficient ways to control the vortex polarity and chirality is of highly fundamental and practical significance towards high speed and high density non-volatile memory applications. Here we report a novel vortex core (VC) switching process in a notched disk, driven by a pulse field. Micromagnetic simulations demonstrate that the dynamics of edge solitons around the notch play a critical role in the switching process, that leads to a sub-nanosecond VC fast switching. The switching diagram as a function of the field strength and duration was presented to indicate the operational range. Further studies on the VC switching under an out-of-plane bias field demonstrate that such switching is deterministic and robust against magnetic environment. Finally, by applying a resonant alternative field, a periodic VC switching is observed with much reduced switching field. The presented results indicate the potential of notched disks for VC based memory applications.