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arXiv 1003.1758cond-mat.mes-hall
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铁磁纳米环中2pi畴壁的稳定性

Stability of 2pi domain walls in ferromagnetic nanorings

Gabriel David Chaves-O'Flynn, Daniel Bedau, Eric Vanden-Eijnden, Andrew D. Kent, Daniel L. Stein

摘要:

通过计算将铁磁纳米环的涡旋态与2pi畴壁分离的最小能量路径,研究了铁磁纳米环中2pi畴壁的稳定性。当俘获畴存在于某些类型的横向畴壁之间时,即,其中在磁条的同一侧上的边缘缺陷具有相等的符号并因此排斥的壁。在这里,这些配置和涡旋磁化状态之间的能量障碍得到使用弦方法。由于环的几何形状,两种类型的2pi壁必须通过它们的整体拓扑指数和交换能来区分。最小能量路径对应于涡旋的排出。湮灭的2PI壁的能量势垒相比,两个环涡状态之间的过渡的激活能。

英文摘要:

The stability of 2pi domain walls in ferromagnetic nanorings is investigated via calculation of the minimum energy path that separates a 2pi domain wall from the vortex state of a ferromagnetic nanoring. Trapped domains are stable when they exist between certain types of transverse domain walls, i.e., walls in which the edge defects on the same side of the magnetic strip have equal sign and thus repel. Here the energy barriers between these configurations and vortex magnetization states are obtained using the string method. Due to the geometry of a ring, two types of 2pi walls must be distinguished that differ by their overall topological index and exchange energy. The minimum energy path corresponds to the expulsion of a vortex. The energy barrier for annihilation of a 2pi wall is compared to the activation energy for transitions between the two ring vortex states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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