外延生长具有本征磁晶各向异性的 $\mathrm{Co_2MnSi}$ 作为实现纳米尺度无偏置场非线性半金属磁子学的途径
Epitaxial $\mathrm{Co_2MnSi}$ with intrinsic magnetocrystalline anisotropy as a route to bias-field-free nonlinear half-metal magnonics at the nanoscale
AI总结：
本文通过研究外延 $\mathrm{L2}_1$ 有序 $\mathrm{Co_2MnSi}$ 波导中的线性和非线性自旋波动力学，展示了其本征立方各向异性可抑制非线性不稳定性并实现无偏置场操作，为半金属磁子学提供了稳健可扩展的平台。
摘要：
半金属霍伊斯勒化合物如 $\mathrm{Co_2MnSi}$ 能够桥接磁子学和自旋电子学功能，用于混合非常规计算方法，具有 100% 自旋极化和相关的低吉尔伯特阻尼 $\alpha\leq 10^{-3}$ 等理想特性。然而，这些理想的材料参数与晶格结构密切相关，尤其对 $\mathrm{Co_2MnSi}$ 中的结构有序性特别敏感。迄今为止，成功制造具有稳健结构完整性的纳米级器件仍然是一个挑战，因此材料参数对非线性自旋波动力学的影响在很大程度上尚未被探索。在这里，我们报告了对具有完美晶体有序性的横向磁化 $\mathrm{Co_2MnSi}$ 波导中线性和非线性自旋波动力学的研究。我们表明，外延 $\mathrm{L2}_1$ 有序 $\mathrm{Co_2MnSi}$ 表现出具有一阶和二阶贡献的本征立方各向异性，稳定了沿晶体 $\langle110\rangle$ 方向的磁化取向。我们确认了未受影响的晶体结构导致图案化结构中磁性保持不变的推论。在此，持久的磁晶各向异性重塑了自旋波色散，从而产生了覆盖数个 GHz 的一阶非线性不稳定性抑制范围——即使在没有偏置场的情况下。此外，可以利用本征磁晶各向异性来抵消形状退磁，从而在有利的 Damon-Eshbach 几何结构中实现稳定的低偏置场操作，具有高群速度和衰减长度。结合已证实的半金属性和超低吉尔伯特阻尼，这项研究将 $\mathrm{Co_2MnSi}$ 确立为一个稳健、可扩展的平台，用于实现无偏置场非线性半金属磁子学。
英文摘要：
Half-metallic Heusler compounds like $\mathrm{Co_2MnSi}$ allow to bridge magnonic and spintronic functionality for hybrid unconventional computing approaches with sought-after properties like 100% spin polarization and associated low Gilbert damping $α\leq 10^{-3}$. However, the desirable material parameters are inherently tied to the crystal lattice with a particularly critical dependence on structural order in $\mathrm{Co_2MnSi}$. To date, the successful fabrication of nanoscale devices with robust structural integrity remains yet a challenge, and consequently the impact of the material parameters on the resulting nonlinear spin-wave dynamics remains largely unexplored. Here, we report on a study of linear and nonlinear spin-wave dynamics in transversally magnetized $\mathrm{Co_2MnSi}$ waveguides with impeccable crystalline ordering. We show that epitaxial, $\mathrm{L2}_1$-ordered $\mathrm{Co_2MnSi}$ exhibits an intrinsic cubic anisotropy with first- and second-order contributions, stabilizing a magnetization alignment along the crystal $\langle110\rangle$ directions. We confirm the implication of an unaffected crystal structure resulting in preserved magnetic properties in the patterned structures. Herein, the persistent magnetocrystalline anisotropy reshapes the spin-wave dispersion which yields a first-order nonlinear instability suppression range extending over several GHz - even for vanishing bias fields. Moreover, the intrinsic magnetocrystalline anisotropy can be exploited to counteract shape demagnetization for a stabilized low bias field operation in the favourable Damon-Eshbach geometry with high group velocities and decay lengths. Together with the proven half-metallicity and ultralow Gilbert damping, this research establishes $\mathrm{Co_2MnSi}$ as a robust, scalable platform towards bias-field-free nonlinear half-metal magnonics.
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