Ruijuan Xu

ferroelectricity, thin films, complex oxides, scanning probe microscopy, freestanding membranes

2023 journal article

Emergent chirality in a polar meron to skyrmion phase transition

NATURE COMMUNICATIONS, 14(1).

Sources: ORCID, Web Of Science
Added: March 19, 2023

2023 article

Size-Induced Ferroelectricity in Antiferroelectric Oxide Membranes

Xu, R., Crust, K. J., Harbola, V., Arras, R., Patel, K. Y., Prosandeev, S., … Hwang, H. Y. (2023, March 19). ADVANCED MATERIALS, Vol. 2.

author keywords: antiferroelectric materials; membranes; phase transition; size effects; sodium niobate
UN Sustainable Development Goal Categories
Sources: ORCID, Web Of Science
Added: February 27, 2023

2021 journal article

Emergent chirality in a polar meron to skyrmion transition revealed by 4D-STEM

Microscopy and Microanalysis, 27(S1), 348–350.

By: Y. Shao*, S. Das*, Z. Hong, R. Xu*, S. Chandrika*, F. Gómez-Ortiz, P. García-Fernández, L. Chen* ...

Sources: NC State University Libraries, ORCID
Added: July 7, 2022

2021 journal article

Fracture and fatigue of thin crystalline SrTiO3 membranes

Applied Physics Letters, 119, 053102.

By: V. Harbola*, R. Xu*, S. Crossley*, P. Singh* & H. Hwang*

Sources: Web Of Science, ORCID
Added: July 7, 2022

2021 journal article

Probing the dynamics of ferroelectric topological oscillators with the electron beam

Microscopy and Microanalysis, 27(S1), 690–692.

Sources: NC State University Libraries, ORCID
Added: July 7, 2022

2021 journal article

Symmetry-aware recursive image similarity exploration for materials microscopy

Npj Computational Materials, 7, 166.

By: T. Nguyen*, Y. Guo*, S. Qin*, K. Frew*, R. Xu* & J. Agar*

TL;DR: This tool justifies continued investment in federated scientific databases with standardized metadata schemas where the combination of filtering and recursive interactive searching can uncover synthesis-structure-property relations. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2020 journal article

Beyond substrates: Strain engineering of ferroelectric membranes

Advanced Materials, 32(43), 2003780.

author keywords: complex oxides on silicon; epitaxial lift-off; ferroelectric domain switching; flexible devices; strain engineering
TL;DR: This approach paves the way toward the fabrication of ultrafast CMOS-compatible ferroelectric memories and ultrasensitive flexible nanosensor devices, and it may also be leveraged for the stabilization of novel phases and functionalities not achievable via direct epitaxial growth. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2020 journal article

Integration of amorphous ferromagnetic oxides with multiferroic materials for room temperature magnetoelectric spintronics

Scientific Reports, 10, 3583.

By: H. Taz*, B. Prasad*, Y. Huang*, Z. Chen*, S. Hsu*, R. Xu*, V. Thakare*, T. Sakthivel* ...

TL;DR: RT magneto-electric coupling was demonstrated by modulating the resistance states of spin-valve structures using electric fields, and FDTO served as an excellent top electrode for ferroelectric switching in BiFeO 3 with no sign of degradation after ~10 10 switching cycles. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2020 journal article

Strain-induced room-temperature ferroelectricity in SrTiO3 membranes

Nature Communications, 11, 3141.

By: R. Xu*, J. Huang*, E. Barnard*, S. Hong*, P. Singh*, E. Wong*, T. Jansen*, V. Harbola* ...

TL;DR: This work reveals the enormous potential of employing oxide membranes to create and enhance ferroelectricity in environmentally benign lead-free oxides, which hold great promise for applications ranging from non-volatile memories and microwave electronics. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2019 journal article

Designing optimal perovskite structure for high ionic conduction

Advanced Materials, 32(1), 1905178.

By: R. Gao, A. Jain, S. Pandya, Y. Dong, Y. Yuan, H. Zhou, L. Dedon, V. Thoreton ...

Source: NC State University Libraries
Added: July 7, 2022

2019 journal article

Freestanding oxide ferroelectric tunnel junction memories transferred onto silicon

Nano Letters, 19(6), 3999–4003.

By: D. Lu*, S. Crossley*, R. Xu*, Y. Hikita* & H. Hwang*

author keywords: Nonvolatile memories; freestanding; oxides; ferroelectric tunnel junctions; pick and place
Sources: Web Of Science, ORCID
Added: July 7, 2022

2019 journal article

Kinetic control of tunable, multi-state switching in ferroelectric thin films

Nature Communications, 10, 1282.

By: R. Xu*, S. Liu*, S. Saremi*, R. Gao*, J. Wang*, Z. Hong*, H. Lu*, A. Ghosh* ...

TL;DR: The ability to select any desired intermediate polarization value via control of the switching pathway in (111)-oriented PbZr0.2Ti0.8O3 films is shown, demonstrating an alternative approach that transcends the inherent bi-stability of ferroelectrics to create non-volatile, deterministic, and repeatedly obtainable multi-state polarization. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2019 journal article

Mechanical-force-induced non-local collective ferroelastic switching in epitaxial lead-titanate thin films

Nature Communications, 10, 3951.

TL;DR: Mechanical-force-induced large-area, non-local, collective ferroelastic domain switching in PbTiO3 epitaxial thin films by tuning the misfit-strain to be near a phase boundary wherein c/a and a 1/a 2 nanodomains coexist. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2019 journal article

Understanding the role of ferroelastic domains on the pyroelectric and electrocaloric effects in ferroelectric thin films

Advanced Materials, 31(5), 1803312.

By: S. Pandya*, G. Velarde*, R. Gao*, A. Everhardt*, J. Wilbur*, R. Xu*, J. Maher*, J. Agar*, C. Dames*, L. Martin*

author keywords: electrocaloric effect; entropy; ferroelastic domains; ferroelectricity; pyroelectric effect
TL;DR: The results demonstrate that temperature- and electric-field-driven domain interconversion under compressive strain diminish both the pyroelectric and the electrocaloric effects, while both these susceptibilities are enhanced due to the exact-opposite effect from the extrinsic contributions under tensile strain. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2018 journal article

Electronic Transport and Ferroelectric Switching in Ion-Bombarded, Defect-Engineered BiFeO3 Thin Films

Advanced Materials Interfaces, 5(3), 1700991.

By: S. Saremi*, R. Xu*, L. Dedon*, R. Gao*, A. Ghosh*, A. Dasgupta*, L. Martin*

author keywords: bismuth ferrite; ferroelectric thin films; ion bombardment; leakage; polarization switching
Sources: Web Of Science, ORCID
Added: July 7, 2022

2018 journal article

Local control of defects and switching properties in ferroelectric thin films

Physical Review Materials, 2(8), 084414.

Sources: Web Of Science, ORCID
Added: July 7, 2022

2018 journal article

Nonstoichiometry, structure, and properties of Ba1−xTiOy thin films

Journal of Materials Chemistry C, 6, 10751–10759.

By: A. Dasgupta*, S. Saremi*, R. Xu*, L. Dedon*, S. Pandya*, A. Damodaran*, L. Martin*

Sources: Web Of Science, ORCID
Added: July 7, 2022

2018 journal article

Reducing coercive-field scaling in ferroelectric thin films via orientation control

ACS Nano, 12(5), 4736–4743.

By: R. Xu*, R. Gao*, S. Saremi*, S. Reyes-Lillo*, Y. Dong*, Y. Qi*, H. Lu*, Z. Chen* ...

author keywords: ferroelectric; thin film; size effects; coercive-field scaling; X-ray diffraction
TL;DR: Overall, this work demonstrates a route toward reducing coercive fields in ferroelectric thin films and provides a possible mechanism to understand the deviation from JKD scaling. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2017 journal article

Differential voltage amplification from ferroelectric negative capacitance

Applied Physics Letters, 111, 253501.

By: A. Khan*, M. Hoffmann*, K. Chatterjee*, Z. Lu*, R. Xu*, C. Serrao*, S. Smith*, L. Martin* ...

UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2017 journal article

Electron Accumulation and Emergent Magnetism in LaMnO3 / SrTiO3 Heterostructures

Physical Review Letters, 119(15), 156801.

By: Z. Chen*, Z. Chen*, Z. Liu*, M. Holtz*, C. Li*, X. Renshaw Wang*, W. Lü*, M. Motapothula* ...

TL;DR: The disentanglement of critical thicknesses for electron reconstruction and the emergence of ferromagnetism in polar-mismatched LaMnO_3/SrTiO_{3} (001) heterostructures are reported, extending the limits of the ability to synthesize and tailor emergent phenomena at interfaces and demonstrating manipulation of the electronic and magnetic structures of materials at the shortest length scales. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2017 journal article

Ferroelectricity in Pb1+δZrO3 Thin Films

Chemistry of Materials, 29(15), 6544–6551.

By: R. Gao, S. Reyes-Lillo, R. Xu*, A. Dasgupta, Y. Dong*, L. Dedon, J. Kim, S. Saremi ...

Sources: Web Of Science, ORCID
Added: July 7, 2022

2017 journal article

Slow Conductance Relaxation in Graphene–Ferroelectric Field-Effect Transistors

Journal of Physical Chemistry C, 121(13), 7542–7548.

By: S. Rogers*, R. Xu*, S. Pandya*, L. Martin* & M. Shim*

UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2017 journal article

Three-State Ferroelastic Switching and Large Electromechanical Responses in PbTiO3 Thin Films

Advanced Materials, 29(37), 1702069.

By: A. Damodaran*, S. Pandya*, J. Agar*, Y. Cao*, R. Vasudevan*, R. Xu*, S. Saremi*, Q. Li* ...

Contributors: A. Damodaran*, S. Pandya*, J. Agar*, Y. Cao*, R. Vasudevan*, R. Xu*, S. Saremi*, Q. Li* ...

author keywords: electromechanical responses; ferroelectrics; thin-film epitaxy; three-state ferroelastic switching
TL;DR: It is demonstrated that deterministic, nonvolatile writing/erasure of large-area patterns of this electromechanical response is possible, thus showing a new pathway to improved function and properties. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Enhanced electrical resistivity and properties via ion bombardment of ferroelectric thin films

Advanced Materials, 28(48), 10750–10756.

By: S. Saremi*, R. Xu*, L. Dedon*, J. Mundy*, S. Hsu*, Z. Chen*, A. Damodaran*, S. Chapman*, J. Evans*, L. Martin*

TL;DR: A novel approach to on-demand improvement of electronic properties in complex-oxide ferroelectrics is demonstrated whereby ion bombardment is applied to the PbTiO3 system, causing deterministic reduction in leakage currents, improved ferroelectric switching, and unprecedented insights into the nature of defects and intergap state evolution in these materials. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Frontiers in strain-engineered multifunctional ferroic materials

MRS Communications, 6, 151–166.

By: J. Agar*, S. Pandya*, R. Xu*, A. Yadav*, Z. Liu*, T. Angsten*, S. Saremi*, M. Asta*, R. Ramamoorthy, L. Martin*

Sources: NC State University Libraries, ORCID
Added: July 7, 2022

2016 journal article

Nanodomain Engineering in Ferroelectric Capacitors with Graphene Electrodes

Nano Letters, 16(10), 6460–6466.

By: H. Lu*, B. Wang*, T. Li*, A. Lipatov*, H. Lee*, A. Rajapitamahuni*, R. Xu*, X. Hong* ...

author keywords: Flexoelectric switching; graphene; domain engineering; ferroelectric films
TL;DR: This paper demonstrates mechanical writing of arbitrary-shaped nanoscale domains in thin-film ferroelectric capacitors with graphene electrodes facilitated by a strain gradient induced by a tip of an atomic force microscope (AFM). (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

New modalities of strain-control of ferroelectric thin films

Journal of Physics: Condensed Matter, 28(26), 263001.

By: A. Damodaran, J. Agar, S. Pandya, Z. Chen, L. Dedon, R. Xu*, B. Apgar, S. Saremi, L. Martin

author keywords: ferroelectrics; thin films; epitaxy; strain
TL;DR: How these new approaches to strain engineering provide promising routes to control and decouple ferroelectric susceptibilities and create new modes of response not possible in the confines of conventional strain engineering is discussed. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Self-Assembled, Nanostructured, Tunable Metamaterials via Spinodal Decomposition

ACS Nano, 10(11), 10237–10244.

By: Z. Chen*, X. Wang*, Y. Qi*, S. Yang*, J. Soares*, B. Apgar*, R. Gao*, R. Xu* ...

author keywords: self-assembly; spinodal decomposition; nanoscale phase separation; metamaterials; VO2; epitaxial thin films
TL;DR: A bottom-up approach to fabricate scalable nanostructured metamaterials via spinodal decomposition is demonstrated, providing an efficient route for the fabrication of nanostructure-based nanomaterials and other nanocomposites for desired functionalities. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Single gate P-N junctions in graphene-ferroelectric devices

Applied Physics Letters, 108, 203109.

Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Strain-induced growth instability and nanoscale surface patterning in perovskite thin films

Scientific Reports, 6, 26075.

By: S. Pandya*, A. Damodaran*, R. Xu*, S. Hsu*, J. Agar* & L. Martin*

TL;DR: A growth-mode transition from 2D-step flow to self-organized, nanoscale 3D-island formation in PbZr0.2Ti0.8O3/SrRuO3./SrTiO3 (001) heterostructures as the kinetics of the growth process respond to the evolution of strain is demonstrated. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2016 journal article

Surface Chemically Switchable Ultraviolet Luminescence from Interfacial Two-Dimensional Electron Gas

Nano Letters, 16(1), 681–687.

By: M. Islam, D. Saldana-Greco*, Z. Gu, F. Wang*, E. Breckenfeld*, Q. Lei*, R. Xu*, C. Hawley ...

author keywords: Two-dimensional electron gas; photoluminescence; LaAlO3/SrTiO3; chemisorption
MeSH headings : Aluminum Oxide / chemistry; Biosensing Techniques; Electrons; Gases / chemistry; Luminescence; Oxides / chemistry; Strontium / chemistry; Surface Properties; Titanium / chemistry; Ultraviolet Rays
TL;DR: Connections between reversible chemisorption, fast electron transfer, and quantum-well luminescence suggest a new model for surface chemically reconfigurable solid-state UV optoelectronics and molecular sensing. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2015 journal article

Ferroelectric polarization reversal via successive ferroelastic transitions

Nature Materials, 14, 79–86.

By: R. Xu*, S. Liu*, J. Karthik*, A. Damodaran*, I. Grinberg*, A. Rappe*, L. Martin*

TL;DR: A combination of thin-film epitaxy, macro- and nanoscale property and switching characterization, and molecular dynamics simulations are used to elucidate the nature of switching in PbZr( 0.2)Ti(0.8)O3 thin films and offer opportunities to change domain reversal speed. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2015 journal article

Orientation-dependent structural phase diagrams and dielectric properties of PbZr1−xTixO3 polydomain thin films

Physical Review B, 91(14), 144106.

Sources: Web Of Science, ORCID
Added: July 7, 2022

2014 journal article

Effect of “symmetry mismatch” on the domain structure of rhombohedral BiFeO3 thin films

Applied Physics Letters, 104, 182908.

By: Z. Chen*, A. Damodaran*, R. Xu*, S. Lee* & L. Martin*

Sources: Web Of Science, ORCID
Added: July 7, 2022

2014 journal article

Stationary domain wall contribution to enhanced ferroelectric susceptibility

Nature Communications, 5, 3120.

By: R. Xu*, J. Karthik*, A. Damodaran* & L. Martin*

TL;DR: The measurement of stationary domain wall contributions to permittivity in PbZr( 0.2)Ti(0.8)O₃ films offers new insights into the microscopic origin of dielectric enhancement and provides a pathway to engineer the dielectrics response of materials. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2014 journal article

Understanding order in compositionally graded ferroelectrics: Flexoelectricity, gradient, and depolarization field effects

Physical Review B, 89(22), 224101.

By: J. Zhang*, R. Xu*, A. Damodaran*, Z. Chen* & L. Martin*

UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID
Added: July 7, 2022

2013 journal article

Tunable Carrier Type and Density in Graphene/PbZr0.2Ti0.8O3 Hybrid Structures through Ferroelectric Switching

Nano Letters, 13(4), 1693–1698.

author keywords: CVD graphene; ferroelectrics; PbZr0.2Ti0.8O3; polarization reversal; interface
MeSH headings : Electrodes; Graphite / chemistry; Iron / chemistry; Lead / chemistry; Semiconductors; Titanium / chemistry; Zirconium / chemistry
TL;DR: Bidirectional interdependency between graphene doping level and ferroelectric polarization is demonstrated in graphene/PbZr0.2Ti0.8O3 hybrid structures and a complete reversal of the current-voltage hysteresis direction is observed in the graphene. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: July 7, 2022

Employment

Updated: February 27th, 2023 14:50

2022 - present

NC State University Raleigh, North Carolina, US
Assistant Professor Materials Science and Engineering

Education

Updated: February 27th, 2023 14:57

2018 - 2022

Stanford University Stanford, CA, US
Postdoctoral Fellow Applied Physics

2014 - 2018

University of California Berkeley Berkeley, CA, US
Ph.D. Materials Science and Engineering

2011 - 2014

University of Illinois at Urbana-Champaign Urbana, IL, US
M.S. Materials Science and Engineering

2007 - 2011

Zhejiang University Hangzhou, Zhejiang, CN
B.E. Materials Science and Engineering

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