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arXiv 1807.02580cond-mat.mes-hall
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交叉偶极交换区圆柱纳米线中的自旋波模

Spin wave modes in a cylindrical nanowire in crossover dipolar-exchange regime

J. Rychły, V. S. Tkachenko, J. W. Kłos, A. Kuchko, M. Krawczyk

摘要:

纳米尺度的磁性系统已被广泛研究,在各种几何形状,如不同的横截面的线,线阵列,点,环等这样的系统有有趣的物理性质和先进的磁性器件的应用前景。均匀的磁性纳米线是目前被广泛研究的基本结构。然而,它们的一些动力学性质,如自旋波模之间的(反)交叉和磁场对自旋波谱的影响,仍需要进一步研究。我们继续这项研究的调查,在固体镍纳米线的圆形截面的自旋波动力学。我们采用两种方法:半解析计算和基于有限元法的数值计算。我们求解耦合的Landau-Lifshitz和麦克斯韦方程组,并考虑静磁和交换相互作用。我们通过绘制自旋波振幅和静磁势的空间分布图来识别色散分支及其(反)交叉。我们还检查我们如何可以通过应用外部磁场来调谐模式的频谱,以及它如何影响模式及其主导类型的相互作用。

英文摘要:

Nanoscale magnetic systems have been studied extensively in various geometries, such as wires of different cross-sections, arrays of wires, dots, rings, etc. Such systems have interesting physical properties and promising applications in advanced magnetic devices. Uniform magnetic nanowires are the basic structures which were broadly investigated. However, some of their dynamical properties, like: (anti)crossing between the spin wave modes and impact of the magnetic field on spin wave spectrum, still need to be exploited. We continue this research by investigation of the spin wave dynamics in solid Ni nanowire of the circular cross-section. We use two approaches: semi-analytical calculations and numerical computations based on finite element method. We solve coupled Landau-Lifshitz and Maxwell equations and consider both magnetostatic and exchange interactions. We identify the dispersion brunches and its (anti)crossing by plotting the spatial profiles of spin wave amplitudes and magnetostatic potential. We also check how we can tune the spectrum of the modes by application of the external magnetic field and how it affects the modes and their dominating type of interaction.

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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