Magnetic vortex core reversal by excitation of spin waves.
Magnetic vortex core reversal by excitation of spin waves.
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DOI：
10.1038/ncomms1277
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发表时间：
2011
影响因子：
16.6
通讯作者：
Schuetz G
中科院分区：
文献类型：
--
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
微米级磁片具有平面内卷曲磁化和纳米级垂直磁化的涡旋核。这些对象具有最简单的非平凡结构，是微磁学的普遍兴趣，并可能为自旋电子学的应用提供新的途径。在亚ghz频率下，利用回旋力本征模激发的低场磁芯切换，在理解非线性涡旋动力学方面取得了重要进展。在频率超过一个数量级时，高涡旋态结构具有由静磁相互作用产生的自旋波特征模。本文通过实验证明，当这些方位角模式被激发时，也会发生单向涡核反转过程。这些结果得到了微磁模拟的证实，清楚地显示了这种新型反转机制的选择规律。我们的分析表明，对于自旋波激励，必须修改临界速度作为开关条件的概念。微米和亚微米大小的磁片在涡旋结构中可能在微磁学和自旋电子学应用中很有用。Kammerer等研究表明，在GHz频率下激发方位自旋波模式时，会发生快速的单向涡核反转过程。
Micron-sized magnetic platelets in the flux-closed vortex state are characterized by an in-plane curling magnetization and a nanometer-sized perpendicularly magnetized vortex core. Having the simplest non-trivial configuration, these objects are of general interest to micromagnetics and may offer new routes for spintronics applications. Essential progress in the understanding of nonlinear vortex dynamics was achieved when low-field core toggling by excitation of the gyrotropic eigenmode at sub-GHz frequencies was established. At frequencies more than an order of magnitude higher vortex state structures possess spin wave eigenmodes arising from the magneto-static interaction. Here we demonstrate experimentally that the unidirectional vortex core reversal process also occurs when such azimuthal modes are excited. These results are confirmed by micromagnetic simulations, which clearly show the selection rules for this novel reversal mechanism. Our analysis reveals that for spin-wave excitation the concept of a critical velocity as the switching condition has to be modified. Micron and submicron-sized magnetic platelets in a vortex configuration may be useful in micromagnetics and spintronics applications. Kammerer et al. show that a fast unidirectional vortex core reversal process occurs when azimuthal spin wave modes are excited at GHz frequency.
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