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arXiv 1607.07975cond-mat.mes-hall
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压控纳米级可重构磁振子晶体

Voltage-Controlled Nano-Scale Reconfigurable Magnonic Crystal

Qi Wang, Andrii V. Chumak, Lichuan Jin, Huaiwu Zhang, Burkard Hillebrands, Zhiyong Zhong

摘要:

利用压控垂直磁各向异性(PMA)在铁磁-介电异质结构中设计了一种纳米级可重构磁振子晶体。栅极金属条纹的周期性阵列放置在顶部的MgO/Co结构,以施加周期性的电场和修改PMA在Co。它的数值表明,施加的电压的栅极条纹修改自旋波传播,并导致形成带隙的自旋波谱。带隙是动态可控的,即可以在几纳秒内打开和关闭带隙。带隙的宽度和中心频率由所施加的电压限定。最后,它示出的电压的应用程序选择,而不是所有的栅极条纹允许一个预定义的修改的带隙谱。该压控可重构磁振子晶体为低功耗磁振子应用开辟了一条新的途径。

英文摘要:

A nano-scale reconfigurable magnonic crystal is designed using voltage-controlled perpendicular magnetic anisotropy (PMA) in ferromagnetic-dielectric hetero-structures. A periodic array of gate metallic stripes is placed on top of a MgO/Co structure in order to apply a periodic electric field and to modify the PMA in Co. It is numerically demonstrated that the application of the voltage to the gate stripes modifies the spin-wave propagation and leads to the formation of band gaps in the spin-wave spectrum. The band gaps are dynamically controllable, i.e. it is possible to switch band gaps on and off within a few nanoseconds. The width and the center frequency of the band gaps is defined by the applied voltage. At last, it is shown that the application of the voltage to selected, rather than to all gate stripes allows for a pre-defined modification of the band gap spectra. The proposed voltage-controlled reconfigurable magnonic crystal opens a new way to low power consumption magnonic applications.

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