Electrical switching of the vortex core in a magnetic disk
Electrical switching of the vortex core in a magnetic disk
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DOI：
10.1038/nmat1867
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发表时间：
2007-04-01
期刊：
影响因子：
41.2
通讯作者：
Ono, Teruo
中科院分区：
文献类型：
--
作者：
Yamada, Keisuke;Kasai, Shinya;Ono, Teruo
磁涡旋是在铁磁盘中实现的卷曲磁性结构，其是用于未来非易失性数据存储设备的存储单元的有希望的候选者（1）。因此，了解磁涡旋的稳定性和动力学行为是发展磁数据存储技术的主要要求。自从发表了关于在磁涡旋中存在具有面外磁化的纳米尺度核心的实验证据（2）以来，人们对涡旋的动力学进行了深入的研究（3-10）。然而，一直缺乏一种电控制磁芯磁化的方法，这是构造涡旋磁芯存储器的关键。在这里，我们证明了通过使用电流驱动的共振动力学的涡流的核心磁化的电气开关;核心开关是由一个强大的动态场，这是由一个旋转的核心运动在一个本地产生的高速每秒几百米。由于共振，实现了在不施加磁场的情况下涡核的有效切换。这开启了一个简单的磁盘作为自旋电子器件的构建块的潜力，例如存储单元，其中位数据被存储为纳米尺度核心磁化的方向。
A magnetic vortex is a curling magnetic structure realized in a ferromagnetic disk, which is a promising candidate for a memory cell for future non-volatile data-storage devices(1). Thus, an understanding of the stability and dynamical behaviour of the magnetic vortex is a major requirement for developing magnetic data-storage technology. Since the publication of experimental proof for the existence of a nanometre-scale core with out-of-plane magnetization in a magnetic vortex(2), the dynamics of vortices have been investigated intensively(3-10). However, a way to electrically control the core magnetization, which is a key for constructing a vortex-core memory, has been lacking. Here, we demonstrate the electrical switching of the core magnetization by using the current-driven resonant dynamics of the vortex; the core switching is triggered by a strong dynamic field that is produced locally by a rotational core motion at a high speed of several hundred metres per second. Efficient switching of the vortex core without magnetic-field application is achieved owing to resonance. This opens up the potentiality of a simple magnetic disk as a building block for spintronic devices such as a memory cell where the bit data is stored as the direction of the nanometre-scale core magnetization.