Asymmetry of spin wave dispersions in a hexagonal magnonic crystal
Asymmetry of spin wave dispersions in a hexagonal magnonic crystal
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DOI：
10.1063/1.4807657
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发表时间：
2013-05-20
影响因子：
4
通讯作者：
Kruglyak, V. V.
中科院分区：
文献类型：
--
作者：
Montoncello, F.;Tacchi, S.;Kruglyak, V. V.
我们报告了一个研究的自旋波的色散在一个六边形阵列的相互作用的铁磁纳米盘的两个正交取向的面内施加的磁场，即，平行或垂直于第一相邻盘的方向。实验数据采用动力学矩阵法进行建模，并根据有效波矢模型对结果进行解释。我们发现在两个正交方向上传播的自旋波在色散曲线上的极大值/极小值的存在和群速度的符号方面表现出明显的不对称性。(C)2013 AIP Publishing LLC.
We report a study of the dispersion of spin waves in a hexagonal array of interacting ferromagnetic nanodisks for two orthogonal orientations of the in-plane applied magnetic field, i.e., either parallel or perpendicular to the direction of first neighbour disks. The experimental data were modelled using the dynamical matrix method, and the results were interpreted in terms of the effective wave vector model. We have found that spin waves propagating in the two orthogonal directions exhibit marked asymmetry concerning the existence of maxima/minima in their dispersion curves and the sign of their group velocities. (C) 2013 AIP Publishing LLC.