Linear and nonlinear magnonic crystals

人工周期性磁结构称为磁振子晶体，为研究自旋波动力学和微波频率下的信号处理提供了独特的可能性。从一维平面结构的研究进展到二维磁振子晶体系统的研究，有望提供一个全新的物理波传播的周期性介质与磁控各向异性。在该项目中，在第一个资助期取得的成果的基础上，我们提出创建二维介观磁振子晶体，并研究它们内部的波传播现象。我们将首先调查的散射本质各向异性自旋波焦散光束和各向同性平面自旋波的结构。我们将继续应对现代磁性器件应用中磁振子晶体的挑战：将创建和研究微型一维和二维（i）低阻尼铁氧体基晶体和（ii）金属，CMOS兼容结构。将验证通过与其他自旋波组和/或外部泵浦的参数相互作用来控制此类器件中的有效自旋波阻尼的可行性，并将研究相关的非线性效应。我们预计，该项目将极大地扩展和丰富我们对各向异性周期结构中线性和非线性自旋波动力学的理解，并在推进磁性晶体领域向现实世界的器件应用方面取得重大进展。

Artificial periodic magnetic structures known as magnonic crystals offer unique possibilities for the investigation of spin-wave dynamics and for signal processing at microwave frequencies. Progressing from studies of one-dimensional planar structures to two-dimensional magnonic crystal systems promises to provide access to the completely new physics of wave propagation in periodic media with magnetically controlled anisotropy. In the project, building on the results achieved in the first funding period, we propose to create two-dimensional mesoscopic magnon-ic crystals and to study wave propagation phenomena inside them. We will first investigate both the scattering of intrinsically anisotropic spin-wave caustic beams and isotropic planar spin waves within the structures. We will move on to tackle the challenge of miniaturizing magnonic crystals for modern magnetic device applications: both micro-sized one- and two-dimensional (i) low-damping ferrite-based crystals and (ii) metallic, CMOS-compatible structures will be created and investigated. The feasibility of controlling the effective spin-wave damping in such devices via parametric interactions with other spin-wave groups and/or external pumping will be verified, and related nonlinear effects will be studied. We anticipate that the project will greatly extend and enrich our understanding of linear and nonlinear spin-wave dynamics in anisotropic periodic structures as well as making significant headway in advancing the field of magnetic crystals towards real-world device applications.