The acoustically driven spin-wave resonance in a phononic-crystal cavity is numerically investigated. The designed cavity enables confinement of gigahertz vibrations in a wavelength-scale point-defect structure and sustains a variety of resonance modes. Inhomogeneous strain distributions in the modes modify the magnetostrictive coupling and the spin-wave excitation susceptible to an external-field orientation. In particular, a monopole-like mode in the cavity having a near-symmetrical pattern shows a subwavelength-scale mode volume and can provide a versatile acoustic excitation scheme independent of the field-angle variation. Thus, the phononic-crystal platform offers an alternative approach to acoustically control the spin-wave dynamics with ultrasmall and inhomogeneous mode structures, which will be a key technology to integrate and operate large-scale magnomechanical circuits.

中文翻译：

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声子晶体磁力学中的模敏磁弹性耦合

数值研究了声子晶体腔中的声驱动自旋波共振。设计的腔体能够将千兆赫兹振动限制在波长尺度的点缺陷结构中，并维持多种共振模式。模式中的不均匀应变分布修改了易受外部场取向影响的磁致伸缩耦合和自旋波激发。特别是类似单极子的具有近对称模式的腔中的模式显示出亚波长尺度的模式体积，并且可以提供与场角变化无关的通用声激励方案。因此，声子晶体平台提供了一种替代方法来声学控制具有超小型和非均匀模式结构的自旋波动力学，这将成为集成和操作大规模磁力学电路的关键技术。