局部二十面体短程有序对非晶钴铁纳米盘磁化动力学的影响
Influence of Local Icosahedral Short-Range Order on the Magnetization Dynamics of Amorphous Cobalt-Iron Nanodisks
AI总结：
研究揭示了非晶钴铁纳米盘中局部二十面体短程有序对磁化动力学的影响，通过多尺度方法揭示结构异质性与磁响应的关系。
摘要：
非晶合金软磁性能的微观起源从根本上与局部拓扑无序和磁交换相互作用之间的相互作用相关。在本研究中，我们采用多尺度自旋-晶格动力学（SLD）方法来研究非晶Co$_{x}$Fe$_{1-x}$纳米盘（x=35, 50, 65）的磁结构相关性。通过将经典分子动力学与广义磁哈密顿量相结合，我们捕捉了晶格振动与自旋预cession之间的动态反馈循环。通过Voronoi分割的拓扑分析，揭示了物种依赖的结构异质性：钴原子倾向于采用“固体状”的二十面体堆积，形成刚性的结构骨架，而铁原子则表现出更高的倾向于“液体状”的无序环境。我们证明这种拓扑差异决定了宏观磁响应。钴驱动的结构刚性保持了稳健的交换网络，最大限度地提高了饱和磁化率，而铁富集区域固有的局部无序引入了交换波动，作为内在的阻尼机制，延缓磁弛豫。这些发现为解释Co-Fe金属玻璃中铁磁序的稳定性提供了原子级解释，并通过配比控制为非晶自旋电子器件中的阻尼参数调节提供了途径。
英文摘要：
The microscopic origin of soft magnetic properties in amorphous alloys is fundamentally linked to the interplay between local topological disorder and magnetic exchange interactions. In this work, we employ a multiscale Spin-Lattice Dynamics (SLD) approach to investigate the magnetostructural correlations in amorphous Co$_{x}$Fe$_{1-x}$ nanodisks ($x=35, 50, 65$). By integrating classical molecular dynamics with a generalized magnetic Hamiltonian, we capture the dynamic feedback loop between lattice vibrations and spin precession. Topological analysis via Voronoi tessellation reveals a persistent species-dependent structural heterogeneity: Cobalt atoms preferentially adopt "solid-like" icosahedral packing, forming a rigid structural backbone, whereas Iron atoms exhibit a higher propensity for "liquid-like" disordered environments. We demonstrate that this topological disparity dictates the macroscopic magnetic response. The Cobalt-driven structural stiffness preserves a robust exchange network that maximizes saturation magnetization, while the local disorder inherent to Iron-rich regions introduces exchange fluctuations that act as an intrinsic damping mechanism, delaying magnetic relaxation. These findings provide an atomistic explanation for the stability of ferromagnetic order in Co-Fe metallic glasses and offer a pathway for tuning damping parameters in amorphous spintronic devices through stoichiometric control.
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