AI 中文总结
本研究通过压电单轴应变池结合扫描氮空位磁力计，原位成像α-MnTe的磁畴，揭示其应变调控的微观路径为畴合并与磁滞碎裂，为应变可编程非共线反铁磁器件开发提供了依据。
AI 中文摘要
非共线反铁磁体将补偿性磁有序与动量依赖的自旋分裂相结合，为实现无传统铁磁体杂散场的自旋电子学功能提供了途径。机械应变是调控其奈尔序的有前景手段，但应变重组非共线反铁磁织构的微观路径仍未明确。本研究将压电驱动单轴应变池与扫描氮空位磁力计相结合，在室温原位压缩过程中对体相α-MnTe的磁畴进行成像。研究发现，压缩通过畴合并重组磁织构，增大了最大连通畴的尺寸，同时降低了畴壁密度。然而卸载时，应变形成的畴网络并未沿加载路径回溯，反而大的连通区域碎裂为新的亚稳态构型，导致最大畴尺寸和杂散场分布出现明显磁滞。这些结果表明，畴连通性和拓扑是应变诱导磁记忆的关键载体，本研究揭示了畴合并与磁滞碎裂是α-MnTe中应变调控的微观路径，并为应变可编程非共线反铁磁织构及可重构自旋电子器件的开发奠定了基础。
英文摘要
Altermagnets combine compensated magnetic order with momentum-dependent spin splitting, offering a route to spintronic functionality without the stray fields of conventional ferromagnets. Mechanical strain provides a promising means of controlling their Néel order, yet the microscopic pathway by which strain reorganizes an altermagnetic texture remains unresolved. Here, we combine scanning nitrogen-vacancy magnetometry with a piezo-driven uniaxial strain cell to directly image the strain-driven evolution of magnetic domains in bulk α-MnTe at room temperature. By applying uniaxial stress along the nearest-neighbor Mn-Mn bond direction, we find that compressive strain reorganizes the magnetic texture through domain coalescence, increasing the size of the largest connected domain while reducing the domain-wall density. On sweeping toward tensile strain direction, however, the domain network follows a distinct trajectory from that observed during the compressive sweep. Instead, the large connected regions fragment into a new metastable configuration, producing pronounced hysteresis in the maximum domain size and stray-field distribution. These results identify domain connectivity and topology as key carriers of strain-induced magnetic memory. Our work reveals domain coalescence and hysteretic fragmentation as the microscopic pathway of strain control in α-MnTe and establishes a route toward strain-programmable altermagnetic textures and reconfigurable spintronic devices.
Comments21 Pages, 3 figures
