We report the development of a hybrid numerical/analytical model capable of mapping the spatially varying distributions of the local ferromagnetic resonance (FMR) frequency and dynamic magnetic susceptibility in a wide class of patterned and compositionally modulated magnetic structures. Starting from the numerically simulated static micromagnetic state, the magnetization is deliberately deflected orthogonally to its equilibrium orientation, and the magnetic fields generated in response to this deflection are evaluated using micromagnetic software. This allows us to calculate the elements of the effective demagnetizing tensor, which are then used within a linear analytical formalism to map the local FMR frequency and dynamic magnetic susceptibility. To illustrate the typical results that one can obtain using this model, we analyze three micromagnetic systems boasting nonuniformity in either one or two dimensions, and successfully explain the spin-wave emission observed in each case, demonstrating the ubiquitous nature of the Schlömann excitation mechanism underpinning the observations. Finally, the developed model of local FMR frequency can be used to explain how spin waves could be confined and steered using magnetic nonuniformities of various origins, rendering it a powerful tool for the mapping of the graded magnonic index in magnonics.

中文翻译：

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在图案化的磁性结构中映射建筑物的景观

我们报告了发展的混合数值/分析模型，能够在各种图案化和成分调制的磁性结构中映射局部铁磁共振（FMR）频率和动态磁化率的空间变化分布。从数值模拟的静态微磁状态开始，故意将磁化强度垂直于其平衡方向偏转，并使用微磁软件评估响应此偏转而产生的磁场。这使我们能够计算有效退磁张量的元素，然后在线性解析形式中使用它们来映射局部FMR频率和动态磁化率。为了说明使用此模型可以获得的典型结果，我们分析了在一个或两个维度上具有不均匀性的三个微磁系统，并成功地解释了在每种情况下观察到的自旋波发射，证明了支持这些观察的席洛曼激发机制无处不在。最后，所开发的局部FMR频率模型可用于解释如何利用各种起源的磁不均匀性来限制和操纵自旋波，使其成为强磁技术中梯度磁强指数映射的有力工具。