Generation of propagating spin waves from regions of increased dynamic demagnetising field near magnetic antidots
Generation of propagating spin waves from regions of increased dynamic demagnetising field near magnetic antidots
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DOI：
10.1063/1.4933263
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发表时间：
2015-10-19
影响因子：
4
通讯作者：
Kruglyak, V. V.
中科院分区：
文献类型：
--
作者：
Davies, C. S.;Sadovnikov, A. V.;Kruglyak, V. V.
我们利用布里渊光散射和微磁模拟证明了一个点状的自旋波源，它是由内在不均匀的内部磁场在一个孤立的反点附近产生的，该反点形成于一层连续的Y3-Fe-石榴石薄膜中。场的不均匀性确保只有反点附近的明确区域对整个样品的连续激发具有谐和微波场的共振响应。然后，样品的共振激发部分作为可重构的自旋波源，以焦散光束的形式传播(穿过所考虑的样品)。我们的发现与磁子电路的进一步发展有关，在磁子电路中可能需要点状自旋波激励，并且可以作为解释由反点阵列形成的磁子晶体中自旋波行为的基础。(C)2015 AIP出版有限责任公司。
We have used Brillouin Light Scattering and micromagnetic simulations to demonstrate a point-like source of spin waves created by the inherently nonuniform internal magnetic field in the vicinity of an isolated antidot formed in a continuous film of yttrium-iron-garnet. The field nonuniformity ensures that only well-defined regions near the antidot respond in resonance to a continuous excitation of the entire sample with a harmonic microwave field. The resonantly excited parts of the sample then served as reconfigurable sources of spin waves propagating (across the considered sample) in the form of caustic beams. Our findings are relevant to further development of magnonic circuits, in which point-like spin wave stimuli could be required, and as a building block for interpretation of spin wave behavior in magnonic crystals formed by antidot arrays. (C) 2015 AIP Publishing LLC.