发表机构
Radboud University; HFML-FELIX, Radboud University; Radboud University, Institute for Molecules and Materials; College of Science and Technology, Nihon University（拉德堡德大学; 哈塞尔巴赫磁学实验室-自由电子激光设施，拉德堡德大学; 拉德堡德大学分子与材料研究所; 日本大学生命理工学部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究衬底介导的声子磁化翻转机制，证实其在多种衬底上适用，发现翻转效率由异质结构全光学响应决定，而非仅衬底吸收。
AI 中文摘要
圆偏振衬底声子的相干激发可驱动相邻磁性层的磁化确定性翻转，但这种衬底介导机制能否推广到不同材料的程度尚未明确。本文测量并比较了生长在多种抗磁衬底上的磁性GdFeCo层中手性依赖磁化翻转的光谱依赖性，在涵盖6个点群及多种红外活性横光学声子对称性的所有研究衬底上均观察到了翻转现象。尽管翻转光谱与Reststrahlen带大致重叠，但其最大值系统地移至相应横光学声子共振更短的波长处，这种光谱失配表明仅衬底吸收不能决定翻转效率。转移矩阵计算显示，强吸收会将能量沉积集中在衬底界面附近，这可能是抑制磁化翻转的局部热源。我们的结果揭示了衬底介导声子翻转的广泛适用性，同时表明其效率由异质结构的全光学响应而非仅衬底吸收决定。
英文摘要
Coherent excitation of circularly-polarized substrate phonons can drive deterministic reversal of magnetization in an adjacent magnetic layer. However, the extent to which this substrate-mediated mechanism can be generalized across different materials remains unresolved. Here, we measure and compare the spectral dependence of helicity-dependent magnetization reversal in magnetic GdFeCo layers grown on a diverse set of diamagnetic substrates. Switching is observed for all investigated substrates, spanning six point groups and several infrared-active transverse-optical phonon symmetries. While the switching spectra broadly overlap with the Reststrahlen bands, their maxima are systematically shifted to wavelengths shorter than the corresponding transverse-optical phonon resonances. This spectral mismatch shows that substrate absorption alone does not determine the switching efficiency. Transfer-matrix calculations show that strong absorption concentrates energy deposition near the substrate interface, providing a possible source of local heating that could suppress magnetization reversal. Our results reveal the broad applicability of substrate-mediated phononic switching while showing that its efficiency is governed by the full optical response of the heterostructure rather than substrate absorption alone.
