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Your search keyword '"Ramamoorthy Ramesh"' showing total 30 results
Start Over Author "Ramamoorthy Ramesh" Journal microscopy and microanalysis
30 results on '"Ramamoorthy Ramesh"'

1. A Three-Dimensional Reconstruction Algorithm for Scanning Transmission Electron Microscopy Data from a Single Sample Orientation

Author

Hamish G Brown, Philipp M Pelz, Shang-Lin Hsu, Zimeng Zhang, Ramamoorthy Ramesh, Katherine Inzani, Evan Sheridan, Sinéad M Griffin, Marcel Schloz, Thomas C Pekin, Christoph T Koch, Scott D Findlay, Leslie J Allen, Mary C Scott, Colin Ophus, and Jim Ciston

Subjects
Microscopy, differential phase contrast, ptychography, scanning transmission electron microscopy, Bioengineering, Biochemistry and Cell Biology, Materials Engineering, Stem Cell Research, image reconstruction, Condensed Matter Physics, Instrumentation
Abstract

Increasing interest in three-dimensional nanostructures adds impetus to electron microscopy techniques capable of imaging at or below the nanoscale in three dimensions. We present a reconstruction algorithm that takes as input a focal series of four-dimensional scanning transmission electron microscopy (4D-STEM) data. We apply the approach to a lead iridate, PbIrO, and yttrium-stabilized zirconia, YZrO, heterostructure from data acquired with the specimen in a single plan-view orientation, with the epitaxial layers stacked along the beam direction. We demonstrate that Pb–Ir atomic columns are visible in the uppermost layers of the reconstructed volume. We compare this approach to the alternative techniques of depth sectioning using differential phase contrast scanning transmission electron microscopy (DPC-STEM) and multislice ptychographic reconstruction.

Published
2022

9. An Optical Sectioning Method for 3D Reconstruction Using 4D-STEM

Author

Colin Ophus, Leslie J. Allen, Jim Ciston, Hamish G. Brown, Shang-Lin Hsu, Mary Scott, Scott D. Findlay, Phillipp Pelz, and Ramamoorthy Ramesh

Subjects
Optics, Optical sectioning, business.industry, Computer science, 3D reconstruction, business, Instrumentation
Published
2020

10. The 4D Camera – An 87 kHz Frame-rate Detector for Counted 4D-STEM Experiments

Author

Jim Ciston, Andrew M. Minor, Chris Harris, Azriel Goldschmidt, Ashwin Selvarajan, Ian Johnson, Philipp M Pelz, Craig Tindall, John Joseph, Erin Fong, Ramamoorthy Ramesh, Shang-Lin Hsu, T. Stezelberger, David Skinner, Patrick Avery, Peter Ercius, Hamish G. Brown, Colin Ophus, Mary Scott, Peter Denes, Jason Lee, Marcus D. Hanwell, David L. Paul, and Brent Draney

Subjects
Microscopy, media_common.quotation_subject, Art history, Biochemistry and Cell Biology, Materials Engineering, Art, Condensed Matter Physics, Instrumentation, media_common
Abstract

Author(s): Ercius, Peter; Johnson, Ian; Brown, Hamish; Pelz, Philipp; Hsu, Shang-Lin; Draney, Brent; Fong, Erin; Goldschmidt, Azriel; Joseph, John; Lee, Jason; Ciston, Jim; Ophus, Colin; Scott, Mary; Selvarajan, Ashwin; Paul, David; Skinner, David; Hanwell, Marcus; Harris, Chris; Avery, Patrick; Stezelberger, Thorsten; Tindall, Craig; Ramesh, Ramamoorthy; Minor, Andrew; Denes, Peter

Published
2020

11. In situ Electric Field Manipulation of Ferroelectric Vortices

Author

Ajay K. Yadav, Christopher T. Nelson, Zijian Hong, Shang-Lin Hsu, Miaofang Chi, Lane W. Martin, Long Qing Chen, Ramamoorthy Ramesh, Philip D. Rack, Cheng Zhang, and Sujit Das

Subjects
In situ, Materials science, Condensed matter physics, Electric field, Instrumentation, Ferroelectricity, Vortex
Published
2019

12. Three-Dimensional Polarization by Means of Scanning HOLZ-CBED Technique

Author

Colin Ophus, J. Ciston, Ramamoorthy Ramesh, Roberto dos Reis, and Shang-Lin Hsu

Subjects
Optics, Materials science, business.industry, 0103 physical sciences, 010306 general physics, business, Polarization (waves), 01 natural sciences, Instrumentation, 010305 fluids & plasmas
Published
2018

13. Mapping Polarity, Toroidal Order, and the Local Energy Landscape by 4D-STEM

Author

David A. Muller, Prafull Purohit, Ramamoorthy Ramesh, Kayla X. Nguyen, Sayeef Salahuddin, Ajay K. Yadav, Yi Jiang, Javier Junquera, Mark W. Tate, Sol M. Gruner, and Michael C. Cao

Subjects
Physics, Order (biology), Toroid, Polarity (physics), 010401 analytical chemistry, Energy landscape, Geometry, 02 engineering and technology, 021001 nanoscience & nanotechnology, 0210 nano-technology, 01 natural sciences, Instrumentation, 0104 chemical sciences
Published
2018

14. Phase Coexistence of Ferroelectric Vortices and Classical a1/a2 Domains in PbTiO3/SrTiO3 Superlattices

Author

Zijian Hong, Ramamoorthy Ramesh, Lane W. Martin, James D. Clarkson, Long Qing Chen, Ajay K. Yadav, Anoop R. Damodaran, Christopher T. Nelson, and Shang-Lin Hsu

Subjects
Physics, Microscopy, Condensed matter physics, Superlattice, Materials Engineering, 02 engineering and technology, Condensed Matter Physics, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Ferroelectricity, 0104 chemical sciences, Vortex, Phase (matter), Biochemistry and Cell Biology, 0210 nano-technology, Instrumentation
Abstract

Author(s): Nelson, Christopher T; Hong, Zijian; Yadav, Ajay K; Damodaran, Anoop R; Hsu, Shang-Lin; Clarkson, James D; Chen, Long-Qing; Martin, Lane W; Ramesh, Ramamoorthy

Published
2018

15. Measuring Orbital Angular Momentum (OAM) and Torque Transfer from Polarization Vortices with the Electron Microscopy Pixel Array Detector

Author

Michael C. Cao, Javier Junquera, David A. Muller, Mark W. Tate, Yi Jiang, Prafull Purohit, Ramamoorthy Ramesh, Sol M. Gruner, Kayla X. Nguyen, and Ajay K. Yadav

Subjects
010302 applied physics, Physics, Angular momentum, business.industry, Detector, 02 engineering and technology, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Optics, Total angular momentum quantum number, 0103 physical sciences, Angular momentum of light, Torque, Orbital angular momentum multiplexing, Orbital angular momentum of light, 0210 nano-technology, business, Instrumentation
Published
2017

16. Observation of Polar Vortices in Oxide Superlattices

Author

Ramamoorthy Ramesh

Subjects
Materials science, Condensed matter physics, Superlattice, Oxide, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, 010305 fluids & plasmas, chemistry.chemical_compound, chemistry, Polar vortex, 0103 physical sciences, 0210 nano-technology, Instrumentation
Published
2016

17. Reconstruction of Polarization Vortices by Diffraction Mapping of Ferroelectric PbTiO3 / SrTiO3 Superlattice Using a High Dynamic Range Pixelated Detector

Author

David A. Muller, Celesta S. Chang, Prafull Purohit, Kayla X. Nguyen, Ajay K. Yadav, Ramamoorthy Ramesh, Mark W. Tate, and Sol M. Gruner

Subjects
Diffraction, Physics, business.industry, Dynamic range, Superlattice, Detector, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Ferroelectricity, 0104 chemical sciences, Vortex, Optics, 0210 nano-technology, business, Instrumentation
Published
2016

18. Studying Thin-film Perovskite Vanadates by EELS

Author

Miaofang Chi, Nigel D. Browning, Ramamoorthy Ramesh, Teruyasu Mizoguchi, and Lane W. Martin

Subjects
Materials science, Chemical engineering, Inorganic chemistry, Thin film, Instrumentation, Perovskite (structure)
Published
2007

19. An in situ TEM Study of Ferroelastic Domain Mobility

Author

Jacob R. Jokisaari, Chung Wung Bark, Xiaoqing Pan, Seung Hyub Baek, Ramamoorthy Ramesh, Chang-Beom Eom, C. T. Nelson, Morgan Trassin, and Peng Gao

Subjects
In situ, Materials science, Chemical physics, Instrumentation, Domain (software engineering)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013

20. Atomic Structure of Surface Dielectric Dead Layer in BiFeO3 Thin Film

Author

Sergei V. Kalinin, Andrew R. Lupini, Anna N. Morozovska, Eugene A. Eliseev, S. J. Pennycook, Young-Min Kim, Pu Yu, Albina Y. Borisevich, Ying-Hao Chu, and Ramamoorthy Ramesh

Subjects
Surface (mathematics), Materials science, Layer by layer, Atomic layer epitaxy, Dead layer, Dielectric, Composite material, Thin film, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Published
2013

21. Direct Mapping of Octahedral Tilts in Perovskite Oxide Materials Using Bright Field Scanning Transmission Electron Microscopy

Author

Sergei V. Kalinin, Ramamoorthy Ramesh, Pu Yu, Ying-Hao Chu, Young-Min Kim, S. J. Pennycook, and Albina Y. Borisevich

Subjects
chemistry.chemical_compound, chemistry, Field (physics), Octahedron, Scanning transmission electron microscopy, Oxide, Analytical chemistry, Instrumentation, Perovskite (structure)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Published
2012

22. Unconventional Antiferroelectric Phase Stabilization in Thin Film BiFeO3 by Interface-Induced Rotoelectric Coupling Effect

Author

Ramamoorthy Ramesh, Young-Min Kim, Ying-Hao Chu, Anna N. Morozovska, James M. Rondinelli, Ilia N. Ivanov, Pu Yu, Amit Kumar, Alexander Tselev, Albina Y. Borisevich, S. J. Pennycook, M. D. Biegalski, Alison Hatt, Eugene A. Eliseev, and Sergei V. Kalinin

Subjects
Materials science, Condensed matter physics, Coupling effect, Phase (matter), Interface (computing), Antiferroelectricity, Thin film, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Published
2012

23. Interplay Between Polarization and Oxygen Stoichiometry at Ferroelectric Domain Boundaries in BiFeO3

Author

S. J. Pennycook, Albina Y. Borisevich, Jan Seidel, and Ramamoorthy Ramesh

Subjects
Oxygen stoichiometry, Materials science, Condensed matter physics, Polarization (electrochemistry), Instrumentation, Ferroelectricity, Domain (software engineering)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

Published
2011

24. Interface Structure-Property Relations Through Aberration-Corrected STEM

Author

Maria Varela, Albina Y. Borisevich, Juan C. Idrobo, Sokrates T. Pantelides, Hilmi Yurdakul, Hye Jung Chang, Servet Turan, Ramamoorthy Ramesh, Pu Yu, Timothy J. Pennycook, Mark P. Oxley, S. J. Pennycook, Andrew R. Lupini, and Donovan N. Leonard

Subjects
Materials science, Condensed matter physics, Interface (Java), Structure property, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Published
2010

25. Uncovering Interface Structure by Column Shape Analysis in ADF STEM Images

Author

Sergei V. Kalinin, Ramamoorthy Ramesh, Albina Y. Borisevich, Pu Yu, Stephen J. Pennycook, Mark P. Oxley, Hye Jung Chang, and Oleg S. Ovchinnikov

Subjects
Crystallography, Materials science, Microscopy, Analytical chemistry, Instrumentation, Microanalysis, Shape analysis (digital geometry)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Published
2010

26. Understanding Domain Structures in BiFeO3 Thin Films by Combining Phase-Field Simulations, TEM, and PFM

Author

Chad M. Folkman, Guang Sheng, Y. L. Li, Darrell G. Schlom, Long Qing Chen, Ramamoorthy Ramesh, Ping P. Wu, R. J. Zeches, B. Winchester, MP Chu, Ho Won Jang, Chang-Beom Eom, Sergei V. Kalinin, Xiaoqing Pan, C. T. Nelson, and J. X. Zhang

Subjects
Materials science, Condensed matter physics, Field (physics), Phase (matter), Thin film, Instrumentation, Domain (software engineering)
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Published
2010

27. Using Neural Network Algorithms for Compositional Mapping in STEM EELS

Author

Albina Y. Borisevich, Andrew R. Lupini, Ramamoorthy Ramesh, Hye Jung Chang, Stephen Jesse, S. J. Pennycook, Sergei V. Kalinin, and M Hujiben

Subjects
Artificial neural network, Computer science, business.industry, Stem eels, Pattern recognition, Artificial intelligence, business, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

Published
2009

28. Interfacial Structure in Multiferroic BiFeO3 Thin Films

Author

Nina Balke, Hye Jung Chang, Ramamoorthy Ramesh, Albina Y. Borisevich, Mark Huijben, S. J. Pennycook, and Sergei V. Kalinin

Subjects
Materials science, Carbon film, Morphology (linguistics), Chemical engineering, Inorganic chemistry, Multiferroics, Thin film, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

Published
2009

29. Studying Vanadium-based Perovskites by Scanning Transmission Electron Microscopy

Author

Quentin M. Ramasse, Miaofang Chi, M Lane, Ramamoorthy Ramesh, and Nigel D. Browning

Subjects
Conventional transmission electron microscope, Materials science, business.industry, Polymer characterization, Scanning transmission electron microscopy, Scanning confocal electron microscopy, Scanning ion-conductance microscopy, Optoelectronics, Energy filtered transmission electron microscopy, Scanning capacitance microscopy, Electron beam-induced deposition, business, Instrumentation
Abstract

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005

Published
2006

30. Interfacial Mismatch and Interface Structure of Epitaxial Pb(Mg1/3Nb2/3)O3 (90%)- PbTiO3 (10%) Relaxor Thin Films

Author

Yuelin Li, Ramamoorthy Ramesh, Valanoor Nagarajan, Zhong Lin Wang, and G. Y. Yang

Subjects
Materials science, Electrostriction, Transmission electron microscopy, Ion milling machine, Composite material, Thin film, High-resolution transmission electron microscopy, Microstructure, Instrumentation, Layer (electronics), Ferroelectricity
Abstract

Pb(Mg1/3Nb2/3)O3 (PMN)- and its solid solution with PbTiO3 (PT) is one of the lead-based relaxor ferroelectrics and has been the most widely studied materials because of their high dielectric constants and high electrostrictive coefficients. The potential impact of the thin film ferroelectric relaxors in the integrated actuators and sensing applications has stimulated research on the growth and characterization of thin films. Thin films have been made by pulsed-laser deposition (PLD), sol-gel and metalrganic chemical-vapor deposition. It is known that electrical properties may be strongly influenced by the microstructure of films and the interface structures between different phase in such heterostructure systems. In this paper, we report the investigation of interfacial mismatch and interface structure of epitaxial Pb(Mg1/3Nb2/3)O3 (90%)- PbTiO3 (10%) relaxor thin film by high resolution transmission electron microscopy (HRTEM).Thin film capacitors of Pb(Mg1/3Nb2/3)O3 (90%) - PbTiO3 (10%) (PMN-PT) were grown by PLD on (100)-oriented LaA1O3 (LAO) substrates. La0.5Sr0.5CoO3 (LSCO) layer was deposited as electrode. Cross-sectional transmission electron microscopy samples were prepared following the traditional procedures including cutting, gluing, polishing and ion milling.

Published
2000

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