室温下Kagome反铁磁体中的大交换磁致伸缩

中文摘要 AI 辅助

高性能磁致伸缩材料的研发对推进传感、致动和微机电系统技术至关重要。尽管在少数铁磁体中已观测到显著的磁致伸缩效应，但对更广泛反铁磁体的磁致伸缩系统性探索仍有限。本文报道在Kagome反铁磁体YMn₆Sn₆中观测到大磁致伸缩现象。在磁场作用下，该体系经历场诱导演化，从螺旋磁基态向共线场极化态转变，伴随大的各向异性晶格应变，室温下体积磁致伸缩超过400 ppm。值得注意的是，直至9 T时，磁致伸缩响应仍近乎完全可逆，且几乎无磁滞行为，有效降低了通常与畴壁钉扎相关的能量耗散。结合实验测量与理论计算表明，这种大且近乎无磁滞的磁致伸缩源于层内铁磁与层间交换相互作用的竞争。该交换驱动的磁弹耦合进一步产生强方向依赖的晶格畸变路径。本研究确立Kagome螺旋磁体为可调谐低耗散磁弹功能及响应式磁机械应用的平台。

英文摘要

The pursuit of high-performance magnetostrictive materials is crucial for advancing technologies in sensing, actuation, and microelectromechanical systems. Although pronounced magnetostrictive effects have been observed in a few ferromagnets, a systematic exploration of magnetostriction across a broader range of antiferromagnets remains limited. Here, we report the observation of large magnetostriction in the kagome antiferromagnet YMn6Sn6. Under a magnetic field, the system undergoes a field-induced evolution from a helical magnetic ground state toward a collinear field-polarized state, accompanied by a large anisotropic lattice strain and a substantial volume magnetostriction exceeding 400 ppm at room temperature. Remarkably, the magnetostrictive response remains nearly fully reversible up to 9 T with nearly hysteresis-free behavior, effectively minimizing the energy dissipation commonly associated with domain-wall pinning. Combined experimental measurements and theoretical calculations reveal that the large, nearly hysteresis-free magnetostriction originates from the competition between intralayer ferromagnetic and interlayer exchange interactions. This exchange-driven magnetoelastic coupling further gives rise to a strongly direction-dependent lattice distortion pathway. This work establishes kagome helimagnets as a tunable platform for low-dissipation magnetoelastic functionalities and responsive magnetomechanical applications.

发表机构

• Tiangong University（天津工业大学）
• Chinese Academy of Sciences（中国科学院）

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