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arXiv 1808.01732cond-mat.mes-hall
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布里渊光散射研究宽度调制纳米线阵列中的自旋波色散和强度关联

Spin wave dispersion and intensity correlation in width-modulated nanowire arrays: A Brillouin light scattering study

G. Gubbiotti, L. L. Xiong, F. Montoncello, L. Giovannini, A. O. Adeyeye

摘要:

利用布里渊光散射光谱和动力学矩阵方法,我们研究了周期性双面宽度调制的坡莫合金纳米线密集阵列中的集体自旋波。宽度调制通过在两个平行纳米线侧面上产生一系列三角形凹口来实现,其中周期性为p=1000 nm,并且在两个横向侧面上的凹口序列的相对位移(D)可调。研究了对称(D=0)和非对称(D= 250和500 nm)宽度调制纳米线。我们发现,所检测到的模式具有布洛赫型的字符,属于一个双重来源于分裂的模式特性的纳米线具有均匀的宽度。有趣的是,磁振子带的振幅、偶极子的频率差以及它们的相对散射强度可以通过增加D而不是具有单面或对称(D=0)双面宽度调制来有效地控制。

英文摘要:

Using Brillouin light scattering spectroscopy and dynamical matrix method calculations, we study collective spin waves in dense arrays of periodically double-side width-modulated Permalloy nanowires. Width modulation is achieved by creating a sequence of triangular notches on the two parallel nanowire sides, with a periodicity of p=1000 nm, and tunable relative displacement (D) of the notches sequence on the two lateral sides. Both symmetric (D=0) and asymmetric (D= 250 and 500 nm) width-modulated nanowires were investigated. We have found that the detected modes have Bloch-type character and belong to a doublet deriving from the splitting of the modes characteristics of the nanowire with homogeneous width. Interestingly, the amplitude of the magnonic band, the frequency difference of the doublet, as well as their relative scattering intensity, can be efficiently controlled by increasing D rather than having single- or symmetric (D=0) double-side width-modulation.

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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