发表机构
National Institute of Science Education and Research (NISER); Homi Bhabha National Institute; Indo-Korea Science and Technology Center (IKST)（印度科学教育研究所; 霍米·巴巴国立研究所; 印韩科技中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过应变调控富铝CoFeAl薄膜，发现非传统磁弹响应源于逆Heusler类局域环境中交换劈裂与晶体场的竞争，为柔性自旋电子学提供可编程磁功能途径。
AI 中文摘要
磁性能的应变工程为柔性自旋电子学应用提供了一条有前景的途径。在此，我们利用应变依赖的磁光Kerr效应显微镜和磁强计测量，报道了柔性衬底上富铝CoFeAl薄膜中的非传统磁弹响应。尽管这些薄膜表现出传统的正磁致伸缩系数，与应力作用下标准的平面内易轴旋转一致，但其饱和磁化强度在压缩应变下增加，在拉伸应变下减少。第一性原理计算揭示，这种非传统响应源于Al富集所创造的逆Heusler类局域环境中，应变诱导的交换劈裂与晶体场效应之间的竞争。这导致了一个高度敏感的、依赖于亚晶格的磁态，与应变诱导的Co和Fe磁矩重构一致。我们的结果表明，局域组分调控可以从根本上改变磁弹行为，确立应变控制的亚晶格补偿作为柔性自旋电子系统中可编程磁功能的一条途径。
英文摘要
Strain engineering of magnetic properties offers a promising route toward flexible spintronic applications. Here, we report an unconventional magnetoelastic response in Al rich Co Fe Al thin films on flexible substrates using strain dependent magneto optical Kerr effect microscopy and magnetometry measurements. While the films exhibit a conventional positive magnetostriction coefficient, consistent with standard in plane easy axis rotation under stress, their saturation magnetization increases under compressive strain and decreases under tensile strain. First principles calculations reveal that this unconventional response originates from a strain induced competition between exchange splitting and crystal field effects in an inverse Heusler like local environment created by Al enrichment. This leads to a highly sensitive, sublattice dependent magnetic state, consistent with a strain induced reconfiguration of Co and Fe moments. Our results demonstrate that local compositional tuning can fundamentally alter magnetoelastic behavior, establishing strain controlled sublattice compensation as a route toward programmable magnetic functionality in flexible spintronic systems.
Comments7 Pages, 5 figures
