Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator.
Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator.
复制标题
磁性涡流动力学的时间分辨成像，使用线性差分运算符的扩展参考自相关的全息图。
DOI：
10.1038/srep36307
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发表时间：
2016-10-31
影响因子：
4.6
通讯作者：
van der Laan G
中科院分区：
文献类型：
--
作者：
Bukin N;McKeever C;Burgos-Parra E;Keatley PS;Hicken RJ;Ogrin FY;Beutier G;Dupraz M;Popescu H;Jaouen N;Yakhou-Harris F;Cavill SA;van der Laan G
本文用线性微分算子扩展参考自相关全息术（HERALDO）研究了磁性薄膜元件涡核和朗道斑图的磁化动力学。在这里，我们提出了第一个时间分辨的X射线测量使用这种技术，并调查的结构和动力学的畴壁激发后，纳秒脉冲磁场。它示出的磁畴壁的平均磁化强度具有垂直分量，可以动态地改变取决于脉冲激励的参数。特别是，我们证明了波子弹样的激励，这是在域壁中产生的，并可以在它们内部的涡核的循环运动期间传播的形成。基于数值模拟，我们还表明，除了核心，有四个奇点形成在角落的图案。这些奇点的极化与涡核有直接关系，并且可以通过特定参数的磁脉冲激发的波弹来动态切换。随后的朗道图案的动力学依赖于核心和奇点的偏振的特定配置。
The magnetisation dynamics of the vortex core and Landau pattern of magnetic thin-film elements has been studied using holography with extended reference autocorrelation by linear differential operator (HERALDO). Here we present the first time-resolved x-ray measurements using this technique and investigate the structure and dynamics of the domain walls after excitation with nanosecond pulsed magnetic fields. It is shown that the average magnetisation of the domain walls has a perpendicular component that can change dynamically depending on the parameters of the pulsed excitation. In particular, we demonstrate the formation of wave bullet-like excitations, which are generated in the domain walls and can propagate inside them during the cyclic motion of the vortex core. Based on numerical simulations we also show that, besides the core, there are four singularities formed at the corners of the pattern. The polarisation of these singularities has a direct relation to the vortex core, and can be switched dynamically by the wave bullets excited with a magnetic pulse of specific parameters. The subsequent dynamics of the Landau pattern is dependent on the particular configuration of the polarisations of the core and the singularities.
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影响因子：
17.1
作者：
Jung, Hyunsung;Choi, Youn-Seok;Kim, Sang-Koog
通讯作者：
Kim, Sang-Koog
影响因子：
3.8
作者：
Duckworth, Thomas A.;Ogrin, Feodor;van der Laan, Gerrit
通讯作者：
van der Laan, Gerrit
影响因子：
3.4
作者：
Barman, Anjan;Barman, Saswati;Otani, Y.
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Otani, Y.
影响因子：
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作者：
Drews, Andre;Krueger, Benjamin;Meier, Guido
通讯作者：
Meier, Guido
影响因子：
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作者：
Kammerer M;Weigand M;Curcic M;Noske M;Sproll M;Vansteenkiste A;Van Waeyenberge B;Stoll H;Woltersdorf G;Back CH;Schuetz G
通讯作者：
Schuetz G