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首页> 外文期刊>Physical review >High-symmetry magnonic modes in antidot lattices magnetized perpendicular to the lattice plane
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High-symmetry magnonic modes in antidot lattices magnetized perpendicular to the lattice plane

机译：垂直于晶格平面磁化的Antidot晶格中的高对称磁子模式

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摘要

Microwave magnetization dynamics on two-dimensional periodic arrays of nanoscale magnetic antidots with magnetic field applied perpendicular to the lattice plane have been studied using ferromagnetic resonance spectroscopy. Linear dependence of the resonant mode frequency on the applied field was observed experimentally. Theoretical calculations show that this linear dependence originates from the high symmetry imposed by applying the field perpendicular to the plane of the antidot lattice. The calculated mode profiles exhibit a fourfold symmetry in contrast to the twofold symmetry typical for the in-plane magnetization direction. From the calculated Bloch wave dispersion the group velocities along the [10] and [11] directions and close to the center of the first Brillouin zone are found to be the same, which demonstrates a very high degree of isotropy of magnonic modes for the center of this zone in this case. Perpendicular standing spin-wave modes due to microwave shielding were also observed on the antidot lattices.
机译：使用铁磁共振光谱技术研究了垂直于晶格平面施加磁场的纳米级解毒剂的二维周期阵列上的微波磁化动力学。实验观察到共振模频率对施加场的线性依赖性。理论计算表明，这种线性依赖性源于通过施加垂直于解毒剂点阵平面的场而施加的高度对称性。与平面内磁化方向典型的双重对称性相比，所计算的模式轮廓表现出双重对称性。根据计算出的布洛赫波频散，发现沿着[10]和[11]方向且靠近第一个布里渊区中心的群速度是相同的，这表明中心的强子模各向同性程度很高在这种情况下该区域。在解毒剂晶格上也观察到由​​于微波屏蔽而产生的垂直驻波模式。

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  • 来源
    《Physical review》 |2012年第10期|p.104414.1-104414.12|共12页
  • 作者

    R. Bali; M. Kostylev; D. Tripathy; A. O. Adeyeye; S. Samarin;

  • 作者单位

    School of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia;

    School of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia,Western Digital Media, 3 Tuas Link 2, Singapore 638552;

    Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,National University of Singapore, Singapore 117576;

    Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,National University of Singapore, Singapore 117576;

    School of Physics, University of Western Australia, Crawley, Western Australia 6009, Australia;

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  • 正文语种 eng
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  • 关键词

    spin waves; multilayers; superlattices;

    机译：自旋波多层超晶格;

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