Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field
Generation of Propagating Spin Waves From Edges of Magnetic Nanostructures Pumped by Uniform Microwave Magnetic Field
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DOI：
10.1109/tmag.2016.2517000
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发表时间：
2016-07-01
影响因子：
2.1
通讯作者：
Kruglyak, V. V.
中科院分区：
文献类型：
--
作者：
Davies, C. S.;Kruglyak, V. V.
薄膜图案化磁性纳米结构被广泛用于感知磁振子器件架构中，以引导和/或操纵自旋波用于数据处理和通信目的。在这里，使用微磁模拟，我们探讨如何内部磁场的不均匀性固有的图案化的磁性纳米结构也可以被利用来创建自旋波源。自旋波发射是通过对图案化结构边缘附近形成的有效磁场增加的有限尺寸区域进行共振激发来实现的。这种现象是相当普遍的，可以用来产生磁偶极子，偶极交换和交换主导的自旋波。根据激发频率和纳米结构的参数，发射的自旋波可以形成高度定向的自旋波焦散光束或更规则的平面自旋波。
Thin-film patterned magnetic nanostructures are widely employed within perceived magnonic device architectures to guide and/or manipulate spin waves for data processing and communication purposes. Here, using micromagnetic simulations, we explore how the internal magnetic field nonuniformity inherent to patterned magnetic nanostructures can also be exploited to create spin-wave sources. The spin-wave emission is achieved through the resonant excitation of finite-sized regions of increased effective magnetic field formed near the edges of patterned structures. The phenomenon is rather universal and could be used to generate magnetodipole, dipole-exchange, and exchange dominated spin waves. Depending on the frequency of excitation and parameters of the nanostructures, the emitted spin waves may form either highly directional spin-wave caustic beams or more regular plane spin waves.