将自旋玻璃动力学集成到纳米机械谐振器中
Integrating spin glass dynamics into nanomechanical resonators
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- National University of Singapore（新加坡国立大学）
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中文总结 AI 辅助
本研究将自旋玻璃动力学集成到纳米机械谐振器中，利用薄层NbFeTe$_2$实现磁-机械耦合，通过低温磁力显微镜观测慢弛豫，并将玻璃态磁畴弛豫转导为应变以改变谐振频率，提供功能性读出平台。
中文摘要 AI 辅助
自旋玻璃是具有显著慢弛豫、老化以及混沌、类突触特性的非平衡磁性系统，其独特的历史依赖动力学一直难以在功能器件中加以利用。二维范德华自旋玻璃磁体通过允许磁性与机械自由度之间的受控耦合，为克服这一局限提供了途径。在此，我们展示了利用薄层剥离的NbFeTe$_2$薄膜将自旋玻璃功能集成到纳米机电系统（NEMS）中，该薄膜在低至几十纳米厚度的层中建立了稳健的自旋玻璃态。通过低温磁力显微镜，我们揭示了与磁性畴簇的玻璃态重组相关的、特征性的小时尺度宏观磁弛豫。将薄层NbFeTe$_2$集成到膜谐振器中，可将这种玻璃态磁畴弛豫转导为应变，从而改变其机械谐振频率。这为自旋玻璃动力学提供了功能性纳米机械读出，并为将受挫磁性集成到NEMS中建立了通用平台。
英文摘要
Spin glasses are non-equilibrium magnetic systems with pronounced slow relaxation, ageing, and chaotic, synaptic-like properties, whose unique history-dependent dynamics have remained difficult to harness in functional devices. Two-dimensional van der Waals spin-glass magnets offer a route to overcome this limitation by allowing controlled coupling between magnetic and mechanical degrees of freedom. Here, we demonstrate the integration of a spin-glass functionality in nanoelectromechanical systems (NEMS) using thin exfoliated NbFeTe$_2$ films, which establishes a robust spin-glass state down to a few tens of nanometer-thick layers. Using cryogenic magnetic force microscopy, we reveal characteristic slow, hour-scale macroscopic magnetic relaxation, associated with glassy reorganisation of its magnetic domain clusters. Incorporation of thin NbFeTe$_2$ into membrane resonators allows the transduction of this glassy magnetic domain relaxation into strain, shifting their mechanical resonance frequency. This provides a functional nanomechanical readout of spin-glass dynamics and establishes a versatile platform for integrating frustrated magnetism into NEMS.
