Publications

2019

  • Yuhan Wang, Jiawei Zhang, Yue Ni, Xinzhong Chen, Ryan Mescall, Tamara Isaacs-Smith, Ryan B. Comes, Salinporn Kittiwatanakul, Stuart A. Wolf , Jiwei Lu, Mengkun Liu. “Structural, Transport, and Ultrafast Dynamic Properties of V1-xNbxO2 Thin Films,” Physical Review B, 99, 245129, Jun 2019. DOI: 10.1103/PhysRevB.99.245129
  • Alexandria C. Bredar, Miles D. Blanchet, Ryan B. Comes, and Byron H. Farnum. “Evidence and Influence of Copper Vacancies in p-Type CuGaO2 Mesoporous Films,” ACS Applied Energy Materials, 2(1), 19-28, Jan 2019. DOI: 10.1021/acsaem.8b01558
  • Tiffany Kaspar, Peter Sushko, Steven Spurgeon, Mark Bowden, David Keavney, Ryan Comes, Sahar Saremi, Lane Martin and Scott Chambers. “Band offset and built-in potential at LaMnO3/SrTiO3 polar/non-polar heterostructures,” Advanced Materials Interfaces, 6 (1), 1801428, Jan 2019. DOI: 10.1002/admi.201801428

2018

  • Shih-Chieh Lin, Cheng-Tai Kuo, Ryan B. Comes, Julien E. Rault, Jean-Pascal Rueff, Slavomir Nemšák, Amina Taleb, Jeffrey B. Kortright, Julia Meyer-Ilse, Eric Gullikson, Peter V. Sushko, Steven R. Spurgeon, Mathias Gehlmann, Lukasz Plucinski, Scott A. Chambers, and Charles S. Fadley. “Interface properties and built-in potential profile of a LaCrO3/SrTiO3 superlattice determined by standing-wave excited photoemission spectroscopy,” Physical Review B98, 165214, Oct 2018. DOI: 10.1103/PhysRevB.98.165124
  • Tiffany C. Kaspar, Seungbum Hong, Mark E. Bowden, Tamas Varga, Pengfei Yan, Chongmin Wang, Steven R. Spurgeon, Ryan B. Comes, Pradeep Ramuhalli & Charles H. Henager Jr. “Tuning piezoelectric properties through epitaxy of La2Ti2O7 and related thin films,” Scientific Reports8, 3037, Feb 2018. DOI: 10.1038/s41598-018-21009-5

2017

  • Steven R. Spurgeon, Peter V. Sushko, Scott A. Chambers, and  Ryan B. Comes. “Dynamic Interface Rearrangement in LaFeO3 / n-SrTiO3 Heterojunctions,” Physical Review Materials, 1, 063401, Nov 2017. DOI: 10.1103/PhysRevMaterials.1.063401  PNNL Highlight
  • Ryan B. Comes, Daniel E. Perea, and Steven R. Spurgeon. “Heterogeneous Two-phase Pillars in Epitaxial NiFe2O4-LaFeO3 Nanocomposites,” Advanced Materials Interfaces, 4, 1700396, Aug 2017. DOI: 10.1002/admi.201700396
  • Kelsey A. Stoerzinger, Ryan B. Comes, Steven R. Spurgeon, Suntharapillai Thevuthasan, Kyuwook Ihm, Ethan J. Crumlin, Scott A. Chambers. “Influence of surface termination on water reactivity in LaFeO3,” Journal of Physical Chemistry Letters, 8, 1038-1043, Mar 2017. DOI: 10.1021/acs.jpclett.7b00195
  • Scott A. Chambers, Yingge Du, Ryan B. Comes, Steven R. Spurgeon, and Peter V. Sushko. “The Effects of Core-level Broadening in Determining Band Alignment at the Epitaxial SrTiO3(001)/p-Ge(001) heterojunction,” Applied Physics Letters, 110, 082104, Feb 2017. DOI: 10.1063/1.4977422
  • Ryan B. Comes, Steven R. Spurgeon, Mark H. Engelhard, Despoina M. Kepaptsoglou, Tiffany C. Kaspar, Quentin M. Ramasse, Peter V. Sushko, and Scott A. Chambers. “Probing the Origin of Interfacial Carriers in SrTiO3-LaCrO3 Superlattices,” Chemistry of Materials, 29, 1147–1155, Feb 2017. DOI: 10.1021/acs.chemmater.6b04329

2016

  • Ryan B. Comes and Scott A. Chambers. “Interface structure, band alignment and built-in potentials at LaFeO3/n-SrTiO3 heterojunctions,” Physical Review Letters, 117, 226802, Nov 2016. DOI: 10.1103/PhysRevLett.117.226802
  • Peng Xu, Yilikal Ayino, Christopher Cheng, Vlad Pribiag, Ryan B. Comes, Peter V. Sushko, Scott A. Chambers and Bharat Jalan. “Understanding and controlling charge density in the two-dimensional electron gas at a polar/non-polar oxide interface,” Physical Review Letters, 117, 106803, Sep 2016. DOI: 10.1103/PhysRevLett.117.106803 PNNL Highlight
  • Ryan B. Comes, Steven R. Spurgeon, Steve M. Heald, Despoina M. Kepaptsoglou, Lewys Jones, Phuong Vu Ong, Mark E. Bowden, Quentin M. Ramasse, Peter V. Sushko, and Scott A. Chambers. “Interface-induced Polarization in SrTiO3-LaCrO3 Superlattices,” Advanced Materials Interfaces, 3(10), 1500779, May 2016. DOI: 10.1002/admi.201500779 Pre-print PNNL Highlight
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  • Ryan B. Comes, Tiffany C. Kaspar, Steve M. Heald, Mark E. Bowden and Scott A. Chambers. “Infrared optical absorption in low-spin Fe2+-doped SrTiO3,” Journal of Physics: Condensed Matter28(3), 035901, Jan 2016. DOI: 10.1088/0953-8984/28/3/035901
  • Yuhan Wang, Ryan B. Comes, Stuart A. Wolf, and Jiwei Lu. “Electrically induced resistive switching in Nb/NbO2/TiN vertical devices,” IEEE Journal of the Electron Devices Society, 4(1), 11-14, Jan 2016. DOI: 10.1109/JEDS.2015.2503922
  • Xiaopu Li, Chung T. Ma, Jiwei Lu, Arun Devaraj, Steven R. Spurgeon, Ryan B. Comes, and S. Joseph Poon. “Self Exchange Bias and Bistable Magneto-Resistance States in Amorphous TbFeCo thin Films,” Applied Physics Letters, 108, 012401, Jan 2016. DOI: 10.1063/1.4939240

2015

  • Ryan B. Comes, Peng Xu, Bharat Jalan, and Scott A. Chambers. “Band alignment of epitaxial SrTiO3 thin films with (LaAlO3)0.3-(Sr2AlTaO6)0.7 (001),” Applied Physics Letters, 107, 131601, Sep 2015. DOI: 10.1063/1.4932063
  • Ryan Comes, Kerry Siebein, Jiwei Lu and Stuart A. Wolf. “Microstructural Effects of Chemical Island Templating in Patterned Matrix-Pillar Oxide Nanocomposites,” CrystEngComm, 17, 2041, Mar 2015. DOI: 10.1039/C5CE00025D 
  • Ryan B. Comes, Sergey Y. Smolin, Tiffany C. Kaspar, Ran Gao, Brent A. Apgar, Lane W. Martin, Mark E. Bowden, Jason B. Baxter, and Scott A. Chambers. “Visible light carrier generation in co-doped epitaxial titanate films,” Applied Physics Letters, 109, 092901, Mar 2015. DOI: 10.1063/1.4913930
  • Yuhan Wang, Ryan B. Comes, Salinporn Kittiwatanakul, Stuart A. Wolf and Jiwei Lu. “Epitaxial niobium dioxide thin films by reactive-biased target ion beam deposition,”  Journal of Vacuum Science and Technology A, 33, 021516, Mar 2015. DOI: 10.1116/1.4906143
  • Matthew A. Steiner, Ryan B. Comes, Jerrold A Floro. William A. Soffa and James M. Fitz-Gerald. “L1’ Ordering Evidence of L10-L12 Hybridization in Strained Fe38.5-Pd61.5 Epitaxial Films,” Acta Materialia, 85, 261-269, Feb 2015. DOI: 10.1016/j.actamat.2014.11.036

2014

  • Ryan Comes, Peter V. Sushko, Steve M. Heald, Robert J. Colby, Mark E. Bowden, and Scott A. Chambers. “Band-Gap Reduction and Dopant Behavior in La, Cr Co-doped SrTiO3 Thin Films,” Chemistry of Materials, 26, 7073-7082, Dec 2014. DOI: 10.1021/cm503541u    PNNL Highlight
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2013

  • Matthew A. Steiner, Ryan B. Comes, Vincent S. Smentkowski, Jerrold A. Floro, William A. Soffa, and James M. Fitz-Gerald. “Strain Induced Mircrostructural and Ordering Behaviors of Epitaxial Fe38.5Pd61.5 Films Grown by Pulsed Laser Deposition,” Journal of Vacuum Science and Technology A, 31, 050824, Aug 2013. DOI: 10.1116/1.4819376
  • Hongxue Liu, Ryan Comes, Yonghang Pei, Jiwei Lu, and Stuart A. Wolf. “Structural, magnetic, and nanoscale switching properties of BiFeO3 thin films grown by pulsed electron deposition,” Journal of Vacuum Science and Technology B, 31, 032801, May 2013. DOI: 10.1116/1.4802924
  • Ryan Comes, Man Gu, Mikhail Khokhlov, Hongxue Liu, Jiwei Lu and Stuart A. Wolf. “Electron Molecular Beam Epitaxy: Layer-by-layer Growth of Complex Oxides via Pulsed Electron-beam Deposition,” Journal of Applied Physics, 113 (2), 023303, Jan 2013. DOI: 10.1063/1.4774238

2012

  • Ryan Comes, Hongxue Liu, Mikhail Khokhlov, Richard Kasica, Jiwei Lu and Stuart A. Wolf. “Directed Self-Assembly of Epitaxial CoFe2O4-BiFeO3 Nanocomposites,” Nano Letters, 12 (5), 2367-2373, May 2012. DOI: 10.1021/nl3003396
  • Ryan Comes, Mikhail Khokhlov, Hongxue Liu, Jiwei Lu and Stuart A. Wolf. “Magnetic anisotropy in composite CoFe2O4-BiFeO3 ultrathin films grown by pulsed-electron deposition,” Journal of Applied Physics, 111 (7), 07D914, Apr 2012. DOI: 10.1063/1.3676413
  • Ryan Comes, Man Gu, Mikhail Khokhlov, Jiwei Lu and Stuart A. Wolf. “Microstructural and domain effects in epitaxial CoFe2O4 films on MgO with perpendicular magnetic anisotropy,” Journal of Magnetism and Magnetic Materials, 324 (4), 524-527, Feb 2012. DOI: 10.1016/j.jmmm.2011.08.033

2010

  • Elon Terrell, Ryan Comes, and C. Fred Higgs. “Analysis of Feature-Scale Wear in Chemical Mechanical Polishing: Modeling and Experiments.” Tribology Letters, 37 (2), 327-336, Feb 2010. DOI: 10.1007/s11249-009-9524-5
  • Ryan Comes, Elon Terrell, and C. Fred Higgs. “Pad Deflection-Based Model of Chemical Mechanical Polishing for Use in CAD IC Layout.” IEEE Transactions on Semiconductor Manufacturing, 23 (1), 121-131, Feb 2010. DOI: 10.1109/TSM.2009.2039182