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arXiv 1502.06482cond-mat.mes-hallcond-mat.str-el
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磁性纳米线中的扭转诱导效应

Torsion induced effects in magnetic nanowires

Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, Yuri Gaididei

摘要:

磁性螺旋线是最简单的磁性系统之一,同时具有弯曲和扭转的特性。易切向各向异性螺旋线存在两种平衡态:在曲率和扭转相对较小的情况下为准切向磁化分布,在相反的情况下为洋葱状磁化分布。在最后一种情况下,磁化强度接近切向磁化强度,偏差是由扭转和弯曲引起的。从理论上研究了具有不同各向异性方向的螺旋磁体可能的平衡磁化状态。扭转也本质上影响自旋波动力学,作为一个有效的磁场。这种磁场来源于曲率诱导的有效Dzyaloshinskii相互作用,导致螺旋手征与磁手征之间的耦合,破坏了自旋波谱的镜像对称性。所有关于磁化静力学和动力学的分析预测都得到了直接自旋晶格模拟的证实。

英文摘要:

Magnetic helix wire is one of the most simple magnetic systems which manifest properties of both curvature and torsion. There exist two equilibrium states in the helix wire with easy-tangential anisotropy: a quasi-tangential magnetization distribution in case of relatively small curvatures and torsions, and an onion state in opposite case. In the last case the magnetization is close to tangential one, deviations are caused by the torsion and curvature. Possible equilibrium magnetization states in the helix magnet with different anisotropy directions are studied theoretically. The torsion also essentially influences the spin-wave dynamics, acting as an effective magnetic field. Originated from the curvature induced effective Dzyaloshinskii interaction, this magnetic field leads to the coupling between the helix chirality and the magnetochirality, it breaks mirror symmetry in spin-wave spectrum. All analytical predictions on magnetization statics an dynamics are well confirmed by the direct spin lattice simulations.

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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