Manipulation of multiple 360° domain wall structures and its current-driven motion in a magnetic nanostripe
Manipulation of multiple 360° domain wall structures and its current-driven motion in a magnetic nanostripe
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磁性纳米带中多个 360 度畴壁结构的操纵及其电流驱动运动
DOI：
10.1063/1.4935693
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发表时间：
2015-11-01
期刊：
影响因子：
1.6
通讯作者：
Hu, Jingguo
中科院分区：
文献类型：
--
作者：
Dong, Wenjun;Su, Yuanchang;Hu, Jingguo
通过微磁模拟研究了磁性纳米带中多个横向壁 (TW) 的动力学。结果表明，当TW以相同方向排列成条状时，它们会相互吸引并最终湮灭。然而，当相邻的TW以相反的方向排列时，可以形成亚稳态复杂壁，例如两个TW导致360度壁。对于三个或更多TW，形成的复杂墙体包括多个360度子结构，这里称为多个360度结构(M360S)。 M360S 本身可用于存储多个逻辑数据，因为每个 360 度子结构都可以充当逻辑“0”或“1”。另一方面，M360S在施加电流的情况下可以表现得像单个TW，即M360S可以像单个TW一样被电流稳定地驱动。发现了 360 度子结构数量对湮灭临界电流的宇称效应。即当数量为奇数或偶数时，临界电流分别随着数量的增加而增加或减少。奇偶校验效应与 M360S 的面外磁矩有关。 (C) 2015 年作者。除非另有说明，所有文章内容均根据 Creative Commons Attribution 3.0 Unported License 获得许可。
Dynamics of multiple transverse walls (TWs) in a magnetic nanostripe is studied by micromagnetic simulations. It shows that, when TWs are arranged in a stripe with same orientation, they will attract each other and finally annihilate. However, when adjacent TWs are arranged with opposite orientation, a metastable complex wall can be formed, e.g., two TWs lead to 360 degrees wall. For three or more TWs, the formed complex wall includes a number of 360 degrees substructures, which is called multiple 360 degrees structure (M360S) here. The M360S itself may be used to store multiple logical data since each 360 degrees substructure can act as logical "0" or "1". On the other hand, the M360S may behave like single TW under an applied current, namely, the M360S can be driven steadily by current like that of single TW. A parity effect of the number of 360 degrees substructures on the critical current for the annihilation is found. Namely, when the number is odd or even, the critical current increase or decrease with the increasing of the number, respectively. The parity effect is relevant to the out-of-plane magnetic moment of the M360S. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.