Nonlinear vortex dynamics and transient domains in ferromagnetic disks
Nonlinear vortex dynamics and transient domains in ferromagnetic disks
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DOI：
10.1103/physrevb.79.172411
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发表时间：
2009-01
影响因子：
3.7
通讯作者：
X. M. Cheng;K. Buchanan;R. Divan;K. Guslienko;D. Source;A. N. Laboratory;Argonne;IL Usa Department of Physics;Colorado State University;F. Collins;C. Materials;IL Usa Department of Physics;University of the Basque Country;S. Sebastian;Spain.
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文献类型：
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作者：
X. M. Cheng;K. Buchanan;R. Divan;K. Guslienko;D. Source;A. N. Laboratory;Argonne;IL Usa Department of Physics;Colorado State University;F. Collins;C. Materials;IL Usa Department of Physics;University of the Basque Country;S. Sebastian;Spain.
我们报道了一种时间分辨成像和微磁模拟研究了磁涡旋在非线性状态下的弛豫动力学。我们使用时间分辨光电发射电子显微镜和微磁计算来研究在长场脉冲限制下，Ni80Fe20图像化磁盘中非线性涡旋动力学的出现。我们发现，当磁芯移动超过磁盘半径的~20-25%时，初始运动的特征是涡旋扭曲、瞬态交联壁状态和影响磁芯轨迹的磁芯极化不稳定。
We report a time resolved imaging and micromagnetic simulation study of the relaxation dynamics of a magnetic vortex in the non-linear regime. We use time-resolved photoemission electron microscopy and micromagnetic calculations to examine the emergence of non-linear vortex dynamics in patterned Ni80Fe20 disks in the limit of long field pulses. We show for core shifts beyond ~20-25% of the disk radius, the initial motion is characterized by distortions of the vortex, a transient cross-tie wall state, and instabilities in the core polarization that influence the core trajectories.