两个正交单极场脉冲对自旋波介导的单向涡核的抑制：三维磁化动力学的本质作用
Spin wave mediated unidirectional Vortex Core Reversal by Two Orthogonal Monopolar Field Pulses: The Essential Role of Three-dimensional Magnetization Dynamics
摘要：
利用扫描透射X射线显微镜（SEM）研究了两个正交单极磁场脉冲（峰值为$B_0$，脉冲长度为60 ps，脉冲延迟时间为-400 ~+400 ps）触发圆柱形Ni 81 Fe 19纳米盘中磁涡旋核极性反转的现象.这两个脉冲在x和y方向上定向在平面内。我们实验研究了作为$B_0$和$Δ$ t函数的涡核反转。由此产生的相图示出了大区域的单向涡核切换的切换阈值调制由于方位角自旋波的共振放大。开关行为根据第一脉冲是在x方向还是y方向上施加而显著变化。这种不对称性可以通过三维微磁模拟而不是二维模拟来再现。这种行为表明，与以前的涡核反转实验相比，三维动力学在这里是必不可少的。
英文摘要：
Scanning transmission x-ray microscopy is employed to investigate experimentally the reversal of the magnetic vortex core polarity in cylindrical Ni81Fe19 nanodisks triggered by two orthogonal monopolar magnetic field pulses with peak amplitude $B_0$, pulse length $τ$=60 ps and delay time $Δ$t in the range from -400 ps to +400 ps between the two pulses. The two pulses are oriented in-plane in the x- and y-direction. We have experimentally studied vortex core reversal as function of $B_0$ and $Δ$t. The resulting phase diagram shows large regions of unidirectional vortex core switching where the switching threshold is modulated due to resonant amplification of azimuthal spin waves. The switching behavior changes dramatically depending on whether the first pulse is applied in the x- or the y-direction. This asymmetry can be reproduced by three-dimensional micromagnetic simulations but not by two-dimensional simulations. This behavior demonstrates that in contrast to previous experiments on vortex core reversal the three-dimensionality in the dynamics is essential here.
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