By Professor Nagarajan Valanoor

Journal articles

Arredondo M; Saunders M; Petraru A; Kohlstedt H; Vrejoiu I; Alexe M; Hesse D; Browning N; Munroe PR; Valanoor N, 2009, 'Structural defects and local chemistry across ferroelectric-electrode interfaces in epitaxial heterostructures', Journal of Materials Science, 44, pp. 5297 - 5306

Cheng C; Kan D; Lim S; Mckenzie WR; Munroe PR; Salamanca-Riba L; Withers RL; Takeuchi I; Valanoor N, 2009, 'Structural transitions and complex domain structures across a ferroelectric-to-antiferroelectric phase boundary in epitaxial Sm-doped BiFeO3 thin films', Physical Review - Section B - Condensed Matter, 80, pp. 014109-1 - 014109-11, http://dx.doi.org/10.1103/PhysRevB.80.014109

Valanoor N; Varatharajan A; Fujino S; Murakami M; Lim S; Fennie C; Wuttig M; Salamanca-Riba L; Takeuchi I, 2008, 'Combinatorial discovery of a lead-free morphotropic phase boundary in a thin-film piezoelectric perovskite', Applied Physics Letters, 92, pp. 202904 - 202906

Valanoor N; Wicks SE; Gregg J; Hambe M, 2008, 'Creation of damage-free feroelectric nanostructures via focused ion beam milling', Nanotechnology, 19, pp. 175302 - 175307

Pojprapai (Imlao) S; Jones JL; Studer AJ; Russell J; Valanoor N; Hoffman M, 2008, 'Ferroelastic domain switching fatigue in lead zirconate titanate ceramics', Acta Materialia, 56, pp. 1577 - 1587, http://dx.doi.org/10.1016/j.actamat.2007.11.044

Alpay S; Valanoor N; Varatharajan A; Mahjoub MR, 2008, 'Ferroelastic domains in bilayered ferroelectric thin films', Journal of Applied Physics, 104, pp. 124103-1 - 124103-5

Valanoor N; Qiu QY; Alpay S, 2008, 'Film thickness versus misfit strain phase diagrams for epitaxial PbTiO3 ultrathin ferroelectric films', Physical Review - Section B - Condensed Matter, 78, pp. 064117-1 - 064117-13

Kohlstedt H; Petraru A; Szot K; Ruediger A; Meuffels P; Haselier H; Waser R; Valanoor N, 2008, 'Method to distinguish ferroelectric from nonferroelectric origin in case of resistive switching in ferroelectric capacitors', Applied Physics Letters, 92

Cheng C; Lim S; Murakami M; Salamanca-Riba L; Takeuchi I; Valanoor N; Varatharajan A, 2008, 'Role of oxygen partial pressure and seed layer chemistry in flux mediated epitaxy of single phase multiferroic BiFeO3 thin films', Applied Physics Letters, 93, pp. 192906-1 - 192906-3

Lim SH; Murakami M; Sarney WL; Ren SQ; Varatharajan A; Nagarajan V; Fujino S; Wuttig M; Takeuchi I; Salamanca-Riba LG, 2007, 'The effects of multiphase formation on strain relaxation and magnetization in multiferroic BiFeO3 thin films', Advanced Functional Materials, 17, pp. 2594 - 2599, http://dx.doi.org/10.1002/adfm.200700055

Valanoor N; Misirlioglu IB; Alpay S, 2007, 'Comment on `Simulation of interface dislocations effect on polarization distribution of ferroelectric thin films`(Appl.Phys.Lett.88,092903 2006)', Applied Physics Letters, 90, pp. 23601 - 23602

Gao X; Wang J; Fujihara K; Ramakrishna SS; Valanoor N; Zhou Z, 2007, 'Giant strain in PbZr0.2Ti0.8O3 nanowires', Applied Physics Letters, 90, pp. 052901-1 - 052901-3

Valanoor N; Varatharajan A; Wicks SE, 2007, 'Nanoscale domain switching behaviour in polycrystalline ferroelectric thin films', Nanotechnology, 18

Anbusathaiah V; Aggarwal S; Valanoor N, 2007, 'Nanoscale polarization relaxation kinetics in polycrystalline ferroelectric thin films', Journal of Applied Physics, 101, pp. 084104-1 - 084014-6, http://dx.doi.org/10.1063/1.2715489

Schuler L; Valanoor N; Miller P; Guy I; Reeves R; Alkaisi M, 2007, 'The effect of substrate material and postannealing on the photoluminescence and piezo properties of DC-sputtered ZnO', Journal of Electronic Materials, 36, pp. 507 - 518

Qiu QY; Valanoor N, 2007, 'Theoretical investigation of polarization scaling in ultrathin epitaxial Pb Zrx Ti1-x O3 films', Journal of Applied Physics, 102, pp. 104113-1 - 104113-12, http://dx.doi.org/10.1063/1.2809334

Valanoor N; JIA C; He JQ; Houben L; Zhao T; Ramesh R; Urban K; Waser R, 2007, 'Unit-cell scale mapping of ferroelectricity and tetragonality in epitaxial ultrathin ferroelectric films', Nature Materials, 6, pp. 64 - 69

Valanoor N; Varatharajan A, 2006, 'Domain wall dynamics in nanoscale ferroelectrics', Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology Iconn, pp. 336 - 339, http://dx.doi.org/10.1109/ICONN.2006.340620

Kim DM; Eom CB; Nagarajan V; Ouyang J; Ramesh R; Vaithyanathan V; Schlom DG, 2006, 'Thickness dependence of structural and piezoelectric properties of epitaxial Pb(Zr 0.52Ti 0.48)O 3 films on Si and SrTiO 3 substrates', Applied Physics Letters, 88, http://dx.doi.org/10.1063/1.2185614

Murakami M; Fujino S; Lim S; Long C; Salamanca-Riba L; Wuttig M; Takeuchi I; Valanoor N; Varatharajan A, 2006, 'Fabrication of multiferroic epitaxial BiCrO3 thin films', Applied Physics Letters, 88, pp. 152902 - 152904, http://www.mse.umd.edu/facstaff/takeuchi/88.pdf

Valanoor N; Stanishevsky A; Ramesh R, 2006, 'Ferroelectric nanostructures via a modified focused ion beam technique', Nanotechnology, 17, pp. 338 - 343, http://dx.doi.org/10.1088/0957-4484/17/1/058

Varatharajan A; Valanoor N; Aggarwal S, 2006, 'High-resolution piezoresponse force microscopy investigation of imprint in ferroelectric thin films', Applied Physics Letters, 89, pp. 132912 - 132914

Zhong S; Alpay S; Valanoor N, 2006, 'Piezoelectric and dielectric tunabilities of ultra-thin ferroelectric heterostructures', Journal of Materials Research, 21, pp. 1600 - 1606

Valanoor N; Junquera J; He J; Jia C; Waser R; Lee K; Kim Y; Baik S; Zhao T; Ramesh R; Ghosez P; Rabe K, 2006, 'Scaling of structure and electrical properties in ultrathin epitaxial ferroelectric heterostructures', Journal of Materials Research, 100, pp. 51609 - 051618

Petraru A; Valanoor N; Kohlstedt H; Ramesh R; Schlom DG; Waser R, 2006, 'Simultaneous measurement of the piezoelectric and dielectric response of nanoscale ferroelectric capacitors by an atomic force microscopy based approach', Applied Physics A - Materials Science and Processing, 84, pp. 67 - 71

Misirlioglu IB; Alpay S; Aindow M; Valanoor N, 2006, 'Thermodynamic and electrostatic analysis of threading dislocations in epitaxial ferroelectric films', Applied Physics Letters, 88, pp. 102906-1 - 102906-3

Nagarajan V; Jia CL; Kohlstedt H; Waser R; Misirlioglu IB; Alpay SP; Ramesh R, 2005, 'Misfit dislocations in nanoscale ferroelectric heterostructures', Applied Physics Letters, 86, pp. 1 - 3, http://dx.doi.org/10.1063/1.1922579

Rodríguez Contreras J; Kohlstedt H; Petraru A; Gerber A; Hermanns B; Haselier H; Nagarajan N; Schubert J; Poppe U; Buchal C; Waser R, 2005, 'Improved PbZr0.52Ti0.48O3 film quality on SrRuO3/SrTiO3 substrates', Journal of Crystal Growth, 277, pp. 210 - 217, http://dx.doi.org/10.1016/j.jcrysgro.2004.12.137

Yang S; Liu B; Ouyang J; Nagarajan V; Kulkarni VN; Ramesh R; Kidder J; Droopad R; Eisenbeiser K, 2005, 'Epitaxial Pb(Zr,Ti)O 3 capacitors on Si by liquid delivery metalorganic chemical vapor deposition', Journal of Electroceramics, 14, pp. 37 - 44, http://dx.doi.org/10.1007/s10832-005-6582-4

Valanoor N; Aggarwal S; Gruverman A; Ramesh R; Waser R, 2005, 'Nanoscale polarization relaxation in a polycrystalline ferroelectric thin film: Role of local environments', Applied Physics Letters, 86

Valanoor N, 2005, 'Scaling of the piezoelectric response in ferroelectric nanostructures: An effective clamping stress model', Applied Physics Letters, 87, pp. 242905, http://dx.doi.org/10.1063/1.2143129

Alpay SP; Misirlioglu IB; Nagarajan V; Ramesh R, 2004, 'Can interface dislocations degrade ferroelectric properties?', Applied Physics Letters, 85, pp. 2044 - 2046, http://dx.doi.org/10.1063/1.1788894

Nagarajan V; Prasertchoung S; Zhao T; Zheng H; Ouyang J; Ramesh R; Tian W; Pan XQ; Kim DM; Eom CB; Kohlstedt H; Waser R, 2004, 'Size effects in ultrathin epitaxial ferroelectric heterostructures', Applied Physics Letters, 84, pp. 5225 - 5227, http://dx.doi.org/10.1063/1.1765742

Prasertchoung S; Nagarajan V; Ma Z; Ramesh R; Cross JS; Tsukada M, 2004, 'Polarization switching of submicron ferroelectric capacitors using an atomic force microscope', Applied Physics Letters, 84, pp. 3130 - 3132, http://dx.doi.org/10.1063/1.1707221

Li JH; Chen L; Nagarajan V; Ramesh R; Roytburd AL, 2004, 'Finite element modeling of piezoresponse in nanostructured ferroelectric films', Applied Physics Letters, 84, pp. 2626 - 2628, http://dx.doi.org/10.1063/1.1695641

Chen L; Ouyang J; Ganpule CS; Nagarajan V; Ramesh R; Roytburd AL, 2004, 'Formation of 90° elastic domains during local 180° switching in epitaxial ferroelectric thin films', Applied Physics Letters, 84, pp. 254 - 256, http://dx.doi.org/10.1063/1.1633970

Chen L; Nagarajan V; Ramesh R; Roytburd AL, 2003, 'Nonlinear electric field dependence of piezoresponse in epitaxial ferroelectric lead zirconate titanate thin films', Journal of Applied Physics, 94, pp. 5147 - 5152, http://dx.doi.org/10.1063/1.1610242

Luo Y; Szafraniak I; Zakharov ND; Nagarajan V; Steinhart M; Wehrspohn RB; Wendorff JH; Ramesh R; Alexe M, 2003, 'Nanoshell tubes of ferroelectric lead zirconate titanate and barium titanate', Applied Physics Letters, 83, pp. 440 - 442, http://dx.doi.org/10.1063/1.1592013

Schrott AG; Misewich JA; Nagarajan V; Ramesh R, 2003, 'Ferroelectric field-effect transistor with a SrRuxTi1-xO3 channel', Applied Physics Letters, 82, pp. 4770 - 4772, http://dx.doi.org/10.1063/1.1588753

Cho Y; Matsuura K; Valanoor N; Ramesh R, 2003, 'Direct domain wall thickness measurement using scanning nonlinear dielectric microscopy', Ferroelectrics, 292, pp. 171 - 180, http://dx.doi.org/10.1080/00150190390222961

Wang J; Neaton JB; Zheng H; Nagarajan V; Ogale SB; Liu B; Viehland D; Vaithyanathan V; Schlom DG; Waghmare UV; Spaldin NA; Rabe KM; Wuttig M; Ramesh R, 2003, 'Epitaxial BiFeO3 multiferroic thin film heterostructures', Science, 299, pp. 1719 - 1722, http://dx.doi.org/10.1126/science.1080615

Maki K; Liu BT; Vu H; Nagarajan V; Ramesh R; Fujimori Y; Nakamura T; Takasu H, 2003, 'Controlling crystallization of Pb(Zr,Ti)O3 thin films on IrO2 electrodes at low temperature through interface engineering', Applied Physics Letters, 82, pp. 1263 - 1265, http://dx.doi.org/10.1063/1.1544057

Nagarajan V; Roytburd A; Stanishevsky A; Prasertchoung S; Zhao T; Chen L; Melngailis J; Auciello O; Ramesh R, 2003, 'Dynamics of ferroelastic domains in ferroelectric thin films', Nature Materials, 2, pp. 43 - 47, http://dx.doi.org/10.1038/nmat800

Li Y; Nagarajan V; Aggarwal S; Ramesh R; Salamanca-Riba LG; Martínez-Miranda LJ, 2002, 'Depth profile study of ferroelectric PbZr0.2Ti0.8O3 films', Journal of Applied Physics, 92, pp. 6762 - 6767, http://dx.doi.org/10.1063/1.1513195

Nagarajan V; Stanishevsky A; Chen L; Zhao T; Liu BT; Melngailis J; Roytburd AL; Ramesh R; Finder J; Yu Z; Droopad R; Eisenbeiser K, 2002, 'Realizing intrinsic piezoresponse in epitaxial submicron lead zirconate titanate capacitors on Si', Applied Physics Letters, 81, pp. 4215 - 4217, http://dx.doi.org/10.1063/1.1516857

Liu BT; Maki K; So Y; Nagarajan V; Ramesh R; Lettieri J; Haeni JH; Schlom DG; Tian W; Pan XQ; Walker FJ; McKee RA, 2002, 'Epitaxial La-doped SrTiO3 on silicon: A conductive template for epitaxial ferroelectrics on silicon', Applied Physics Letters, 80, pp. 4801 - 4803, http://dx.doi.org/10.1063/1.1484552

Liu BT; Maki K; Aggarwal S; Nagaraj B; Nagarajan V; Salamanca-Riba L; Ramesh R; Dhote AM; Auciello O, 2002, 'Low-temperature integration of lead-based ferroelectric capacitors on Si with diffusion barrier layer', Applied Physics Letters, 80, pp. 3599 - 3601, http://dx.doi.org/10.1063/1.1477281

Roelofs A; Pertsev NA; Waser R; Schlaphof F; Eng LM; Ganpule C; Nagarajan V; Ramesh R, 2002, 'Depolarizing-field-mediated 180° switching in ferroelectric thin films with 90° domains', Applied Physics Letters, 80, pp. 1424 - 1426, http://dx.doi.org/10.1063/1.1448653

Ganpule CS; Nagarajan V; Hill BK; Roytburd AL; Williams ED; Ramesh R; Alpay SP; Roelofs A; Waser R; Eng LM, 2002, 'Imaging three-dimensional polarization in epitaxial polydomain ferroelectric thin films', Journal of Applied Physics, 91, pp. 1477 - 1481, http://dx.doi.org/10.1063/1.1421219

Nagarajan V; Ganpule CS; Stanishevsky A; Liu BT; Ramesh R, 2002, 'Nanoscale phenomena in synthetic functional oxide heterostructures', Microscopy and Microanalysis, 8, pp. 333 - 349, http://dx.doi.org/10.1017/s1431927602020287

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