globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1806074116
论文题名:
Thickness scaling of ferroelectricity in BiFeO 3 by tomographic atomic force microscopy
作者: Steffes J.J.; Ristau R.A.; Ramesh R.; Huey B.D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:7
起始页码: 2413
结束页码: 2418
语种: 英语
英文关键词: 3D ; AFM ; BiFeO3 ; Ferroelectric ; Tomography
Scopus关键词: article ; atomic force microscopy ; controlled study ; polarization ; reliability ; room temperature ; thickness ; tomography ; transmission electron microscopy
英文摘要: Nanometer-scale 3D imaging of materials properties is critical for understanding equilibrium states in electronic materials, as well as for optimization of device performance and reliability, even though such capabilities remain a substantial experimental challenge. Tomographic atomic force microscopy (TAFM) is presented as a subtractive scanning probe technique for high-resolution, 3D ferroelectric property measurements. Volumetric property resolution below 315 nm 3 , as well as unit-cell-scale vertical material removal, are demonstrated. Specifically, TAFM is applied to investigate the size dependence of ferroelectricity in the room-temperature multiferroic BiFeO 3 across two decades of thickness to below 1 nm. TAFM enables volumetric imaging of ferroelectric domains in BiFeO 3 with a significant improvement in spatial resolution compared with existing domain tomography techniques. We additionally employ TAFM for direct, thickness-dependent measurements of the local spontaneous polarization and ferroelectric coercive field in BiFeO 3 . The thickness-resolved ferroelectric properties strongly correlate with cross-sectional transmission electron microscopy (TEM), Landau–Ginzburg–Devonshire phenomenological theory, and the semiempirical Kay–Dunn scaling law for ferroelectric coercive fields. These results provide an unambiguous determination of a stable and switchable polar state in BiFeO 3 to thicknesses below 5 nm. The accuracy and utility of these findings on finite size effects in ferroelectric and multiferroic materials more broadly exemplifies the potential for novel insight into nanoscale 3D property measurements via other variations of TAFM. © National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163568
Appears in Collections:气候变化与战略

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作者单位: Steffes, J.J., Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, United States, Integration and Yield Engineering, GlobalFoundries, Hopewell Junction, NY 12533, United States; Ristau, R.A., Institute of Materials Science, University of Connecticut, Storrs, CT 06269, United States; Ramesh, R., Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, United States, Department of Physics, University of California, Berkeley, CA 94720, United States, Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Huey, B.D., Department of Materials Science and Engineering, University of Connecticut, Storrs, CT 06269, United States, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, United States

Recommended Citation:
Steffes J.J.,Ristau R.A.,Ramesh R.,et al. Thickness scaling of ferroelectricity in BiFeO 3 by tomographic atomic force microscopy[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(7)
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