Revealing buried ferroelectric topologies by depth-resolved electron diffraction imaging
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908930235432960 |
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| author | Liu, Ting-Ran Jagadish, Koushik Guo, Xiangwei Ramesh, Maya Meisenheimer, Peter Kumarasubramanian, Harish Husain, Sajid Ngo, Ann V. Avishai, Amir Ravichandran, Jayakanth Schlom, Darrell G. Ramesh, Ramamoorthy Shao, Yu-Tsun |
| author_facet | Liu, Ting-Ran Jagadish, Koushik Guo, Xiangwei Ramesh, Maya Meisenheimer, Peter Kumarasubramanian, Harish Husain, Sajid Ngo, Ann V. Avishai, Amir Ravichandran, Jayakanth Schlom, Darrell G. Ramesh, Ramamoorthy Shao, Yu-Tsun |
| contents | Nanoscale topological polar textures promise new functionalities for ferroelectric memories and logic, yet their three-dimensional structure and mesoscale organization remain experimentally inaccessible. Here we introduce depth-resolved electron diffraction imaging (DREDI), a fast, non-destructive, method that maps polarization with <50 nm lateral and <10 nm depth sensitivity within fraction of a second. Its high acquisition speed enables the first continuous polarization mapping across six orders of magnitude in length scale, from nanometers to millimeters. Using epitaxial BiFeO3 films, DREDI reveals a hidden depth evolution of polar textures: surface 71-degree stripes evolve into subsurface flux-closure vortices that bifurcate into three-fold vertices near the bottom interface. Cross-sectional multi-slice electron ptychography and phase-field modeling confirm these buried configurations and attribute them to strain heterogeneity and ferroelastic twinning in the SrRuO3 electrode. Large-area analysis further shows that vertex-like frustration forms a mesoscale percolating network above a critical length scale of 4 um. DREDI enables real-time, volumetric studies of buried topological textures in ferroic nanomaterials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_00483 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Revealing buried ferroelectric topologies by depth-resolved electron diffraction imaging Liu, Ting-Ran Jagadish, Koushik Guo, Xiangwei Ramesh, Maya Meisenheimer, Peter Kumarasubramanian, Harish Husain, Sajid Ngo, Ann V. Avishai, Amir Ravichandran, Jayakanth Schlom, Darrell G. Ramesh, Ramamoorthy Shao, Yu-Tsun Materials Science Mesoscale and Nanoscale Physics Nanoscale topological polar textures promise new functionalities for ferroelectric memories and logic, yet their three-dimensional structure and mesoscale organization remain experimentally inaccessible. Here we introduce depth-resolved electron diffraction imaging (DREDI), a fast, non-destructive, method that maps polarization with <50 nm lateral and <10 nm depth sensitivity within fraction of a second. Its high acquisition speed enables the first continuous polarization mapping across six orders of magnitude in length scale, from nanometers to millimeters. Using epitaxial BiFeO3 films, DREDI reveals a hidden depth evolution of polar textures: surface 71-degree stripes evolve into subsurface flux-closure vortices that bifurcate into three-fold vertices near the bottom interface. Cross-sectional multi-slice electron ptychography and phase-field modeling confirm these buried configurations and attribute them to strain heterogeneity and ferroelastic twinning in the SrRuO3 electrode. Large-area analysis further shows that vertex-like frustration forms a mesoscale percolating network above a critical length scale of 4 um. DREDI enables real-time, volumetric studies of buried topological textures in ferroic nanomaterials. |
| title | Revealing buried ferroelectric topologies by depth-resolved electron diffraction imaging |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.00483 |