合成磁性氧化物异质结构中通过手征声子的非常规层间交换耦合
Unconventional interlayer exchange coupling via chiral phonons in synthetic magnetic oxide heterostructures
摘要：
声子的手征对称性破缺由于与自旋自由度的强耦合而在量子涌现现象中起着至关重要的作用。然而，手征声子-自旋耦合的直接实验证据是缺乏的。在这项研究中，我们报告了原子控制的铁磁金属（SrRuO 3）-铁磁绝缘体（SrTiO 3）异质结构中的手性声子介导的层间交换相互作用。由于非常规的层间交换相互作用，我们已经观察到旋转的磁矩作为一个功能的绝缘间隔层的厚度，导致自旋螺旋状态。声子塞曼效应进一步证实了手性声子-自旋耦合。手征声子的存在及其与自旋的相互作用以及我们的原子尺度异质结构方法为揭示手征声子在磁性材料中的关键作用打开了一扇窗户。
英文摘要：
Chiral symmetry breaking of phonons plays an essential role in emergent quantum phenomena owing to its strong coupling to spin degree of freedom. However, direct experimental evidence of the chiral phonon-spin coupling is lacking. In this study, we report a chiral phonon-mediated interlayer exchange interaction in atomically controlled ferromagnetic metal (SrRuO3)-nonmagnetic insulator (SrTiO3) heterostructures. Owing to the unconventional interlayer exchange interaction, we have observed rotation of magnetic moments as a function of nonmagnetic insulating spacer thickness, resulting in a spin spiral state. The chiral phonon-spin coupling is further confirmed by phonon Zeeman effects. The existence of the chiral phonons and their interplay with spins along with our atomic-scale heterostructure approach open a window to unveil the crucial roles of chiral phonons in magnetic materials.
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