发表机构
Universidade Federal Rural de Pernambuco; Universidade Federal de Pernambuco（巴西联邦农村大学; 巴西联邦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过磁光测量发现Py/NiO双层结构在磁场下产生高达400纳米的光谱位移，证实了反铁磁NiO层内禀磁振子与光的强耦合，为光学调控反铁磁自旋动力学提供了新平台。
AI 中文摘要
本文对Py/NiO双层结构进行的磁光磁强计测量揭示了一种显著的磁场诱导波长位移，证明了该反铁磁体系中存在强磁光耦合。随着外加磁场的增加，观察到系统性的单调光谱位移，最大可达约400纳米，并在较高磁场下趋于饱和。定量分析表明，相关的磁光能量变化量级约为10^7电子伏特，与NiO中的磁振子能量尺度相当。由于NiO层厚度较大，观察到的效应源于反铁磁NiO层内部固有的磁振子，而非由Py底层注入的自旋流。这些结果为通过磁光相互作用实现磁场对反铁磁磁振子能量的控制提供了直接实验证据，确立了Py/NiO双层结构作为光学探测和操控反铁磁自旋动力学的一个有前景的平台。
英文摘要
Here, magneto-optical magnetometry measurements on Py/NiO bilayers reveal a pronounced magnetic-field-induced wavelength shift, demonstrating strong magneto-optical coupling in this antiferromagnetic system. A systematic and monotonic spectral shift of up to ~ 400 nm is observed as the applied magnetic field increases, saturating at higher fields. Quantitative analysis shows that the associated magneto-optical energy variation is on the order of 107 eV, comparable to the magnon energy scale in NiO. Owing to the large NiO thickness, the observed effect originates from magnons intrinsic to the antiferromagnetic NiO layer rather than from spin currents injected by the Py underlayer. These results provide direct experimental evidence for magnetic-field control of antiferromagnetic magnon energies via magneto-optical interactions, establishing Py/NiO bilayers as a promising platform for optically probing and manipulating antiferromagnetic spin dynamics.
