自支撑反铁磁氧化物薄膜：Cr$_2$O$_3$的合成与表征
Freestanding Antiferromagnetic Oxide Membranes: Synthesis and Characterization of Cr$_2$O$_3$
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中文总结 AI 辅助
本研究利用LSMO牺牲层成功制备毫米级自支撑Cr$_2$O$_3$反铁磁薄膜，应变通过多晶畴释放，保持单晶有序性，并证实了高于室温的Néel转变，为应变调控反铁磁和磁电性提供了平台。
中文摘要 AI 辅助
反铁磁（AFM）绝缘体作为一类有前景的材料，在快速切换、节能的基于磁振子的技术中脱颖而出，但我们对如何通过晶格调控这些性质的理解仍然有限。作为一种具有强磁电响应的AFM绝缘体，Cr$_2$O$_3$薄膜作为通过应变探索多模态可调性的有前景平台而脱颖而出。然而，由于缺乏具有兼容晶格常数和足够表面质量的可蚀刻牺牲层，制备这些薄膜具有挑战性。我们通过利用La$_{0.7}$Sr$_{0.3}$MnO$_3$（LSMO）作为牺牲层来解决这一问题，成功制备了毫米级Cr$_2$O$_3$薄膜。无衬底表征揭示，生长过程中晶格失配引起的应变通过形成小多晶畴而释放，在约90%的薄膜面积上保持单晶有序性。透射电子显微镜、X射线衍射、拉曼光谱和二次谐波产生光谱证实了类块体结构性质。铂霍尔测量揭示了高于室温的Néel转变。这些结果确立了Cr$_2$O$_3$薄膜作为应变调控反铁磁性和磁电性的可行平台。
英文摘要
Antiferromagnetic (AFM) insulators stand out as a promising class of materials for fast switching, energy-efficient magnon-based technology, but our understanding of how to tune these properties with the lattice remains limited. As an AFM insulator with strong magnetoelectric response, Cr$_2$O$_3$ membranes stand out as a promising platform to explore multi-modal tunability via strain. However, fabricating these membranes is challenging due to the scarcity of etchable sacrificial layers with compatible lattice constants and sufficient surface quality. We address this issue by utilizing La$_{0.7}$Sr$_{0.3}$MnO$_3$ (LSMO) as a sacrificial layer, enabling successful fabrication of millimeter-scale Cr$_2$O$_3$ membranes. Substrate-free characterization reveals that strain due to the lattice mismatch during growth is released by the formation of small polycrystalline domains, preserving single-crystalline order over ~90% of the membrane area. Bulk-like structural properties are confirmed by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and second-harmonic generation spectroscopy. Platinum Hall measurements reveal an above-room-temperature N$é$el transition. These results establish Cr$_2$O$_3$ membranes as a viable platform for strain-tuning antiferromagnetism and magnetoelectricity.
发表机构
- Stanford University（斯坦福大学）
- SLAC National Accelerator Laboratory（SLAC国家加速器实验室）
- Linac Coherent Light Source, SLAC National Accelerator Laboratory（SLAC国家加速器实验室直线相干光源）
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