Catalin Harnagea

PhD Student, part-time RA

Catalin Harnagea

Tel.: +1 (514) 228-6946
Fax: +1 (450) 929-8102

To elucidate the relationship(s) between friction forces and charges, experiments at well-defined interfaces are required. A crucial simplification is achieved by reducing one of the surfaces in contact with the other down to a single asperity. Such single-asperity contact experiments are performed using an atomic force microscope (AFM), which is a tool that can detect forces down to atomic the scale. In this approach, the (normal) interaction between a sharp probe (“tip”, the asperity used in friction experiments), is regulated while other physical quantities involved (e.g. lateral force, potential) are varied/monitored. The figure shows an example of friction control by charges deposited/injected previously by the biased AFM tip.


NFL publications

S. Chandra, R. Das, V. Kalappattil, T. Eggers, C. Harnagea, R. Nechache, M. Phan, F. Rosei, and H. Srikanth. Epitaxial magnetite nanorods with enhanced room temperature magnetic anisotropy. Nanoscale, 9, 7858 (2017). (PDF).
W. Huang, C. Harnagea, D. Benetti, M. Chaker, F. Rosei, and R. Nechache. Multiferroic Bi2FeCrO6 based p–i–n heterojunction photovoltaic devices. J. Mater. Chem. A, , 10355–10364 (2017). (PDF).
S. Li, J. Z., B. Zhang, W. Huang, C. Harnagea, R. Nechache, L. Zhu, S. Z., Y. Lin, L. Ni, Y. Sang, H. Liu, and F. Rosei. Manipulation of charge transfer in vertically aligned epitaxial ferroelectric KNbO3 nanowire array photoelectrodes. Nano Energy, 35, 92–100 (2017). (PDF).
J. Chakrabartty, R. Nechache, C. Harnagea, Shun Li, and F. Rosei. Enhanced photovoltaic properties in bilayer BiFeO3/Bi-Mn-O thin films. Nanotechnology, 27, 215402 (2016). (PDF).
R. Nechache, C. Harnagea, S. Li, L. Cardenas, W. Huang, J. Chakrabartty, and F. Rosei. Bandgap tuning of multiferroic oxide solar cells. Nature Photonics, 9, 61–67 (2015). (PDF).
M. Cloutier, C. Harnagea, P. Hale, O. Seddiki, F. Rosei, and D. Mantovani. Long-term stability of hydrogenated DLC coatings: Effects of aging on the structural, chemical and mechanical properties. Diamond & Related Materials, 48, 65–72 (2014). (PDF).
O. Seddiki, C. Harnagea, L. Levesque, D. Mantovani, and F. Rosei. Evidence of antibacterial activity on titanium surfaces through nanotextures. Applied Surface Science, 308, 275–284 (2014). (PDF).
J. P. Chakrabartty, R. Nechache, C. Harnagea, and F. Rosei. Photovoltaic effect in multiphase Bi-Mn-O thin films. Optics Express, 22, A80–A89 (2014). (PDF).
C. Harnagea, M. Azodi, R. Nechache, C. - V. Cojocaru, V. Buscaglia, M. T. Buscaglia, P. Nanni, F. Rosei, and A. Pignolet. Characterization of individual multifunctional nanoobjects with restricted geometry. Phase Transitions, 86, 635–650 (2013). (PDF).
R. A. Boulos, C. Harnagea, X. Duan, R. N. Lamb, F. Rosei, and C. L. Raston. Unzipping oyster shell. RSC Advances, 3, 3284–3290 (2013). (PDF).
M. Azodi, C. Harnagea, V. Buscaglia, M. T. Buscaglia, P. Nanni, F. Rosei, and A. Pignolet. Ferroelectric Switching in Bi4Ti3O12 Nanorods. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 59, 1903–1911 (2012). (PDF).
C. P. Brown, C. Harnagea, H. S. Gill, A. J. Price, E. Traversa, S. Licoccia, and F. Rosei. Rough Fibrils Provide a Toughening Mechanism in Biological Fibers. ACS Nano, 6, 1961–1969 (2012). (PDF).
S. Li, R. Nechache, C. Harnagea, L. Nikolova, and F. Rosei. Single-crystalline BiFeO3 nanowires and their ferroelectric behavior. Applied Physics Letters, 101, 192903 (2012). (PDF).
J. M. MacLeod, C. V. Cojocaru, F. Ratto, C. Harnagea, A. Bernardi, M. I. Alonso, and F. Rosei. Modified Stranski-Krastanov growth in Ge/Si heterostructures via nanostenciled pulsed laser deposition. Nanotechnology, 23, 065603 (2012). (PDF).
R. Nechache, C. Harnagea, and F. Rosei. Multiferroic nanoscale Bi2FeCrO6 material for spintronic-related applications. Nanoscale, 4, 5588–5592 (2012). (PDF).
D. Obi, R. Nechache, C. Harnagea, and F. Rosei. Mechanical and electrical properties of epitaxial Si nanowires grown by pulsed laser deposition. Journal of physics. Condensed matter : an Institute of Physics journal, 24, 445008 (2012).
J. Toster, C. Harnagea, K. S. Iyer, F. Rosei, and C. L. Raston. Controlling anatase coating of diatom frustules by varying the binding layer. Crystengcomm, 14, 3446–3450 (2012). (PDF).
R. Nechache, C. V. Cojocaru, C. Harnagea, C. Nauenheim, M. Nicklaus, A. Ruediger, F. Rosei, and A. Pignolet. Epitaxial Patterning of Bi2FeCrO6 Double Perovskite Nanostructures: Multiferroic at Room Temperature. Advanced Materials, 23, 1724–1729 (2011). (PDF).
R. Nechache, C. Harnagea, S. Licoccia, E. Traversa, A. Ruediger, A. Pignolet, and F. Rosei. Photovoltaic properties of Bi2FeCrO6 epitaxial thin films. Applied Physics Letters, 98, 202902 (2011). (PDF).
C. - V. Cojocaru, R. Nechache, C. Harnagea, A. Pignolet, and F. Rosei. Nanoscale patterning of functional perovskite-type complex oxides by pulsed laser deposition through a nanostencil. Applied Surface Science, 256, 4777–4783 (2010). (PDF).
R. Nechache, C. Harnagea, A. Ruediger, F. Rosei, and A. Pignolet. EFFECT OF EPITAXIAL STRAIN ON THE STRUCTURAL AND FERROELECTRIC PROPERTIES OF Bi-2 FeCrO6 THIN FILMS. Functional Materials Letters, 3, 83–88 (2010). (PDF).
C. Yan, L. Nikolova, A. Dadvand, C. Harnagea, A. Sarkissian, D. F. Perepichka, D. Xue, and F. Rosei. Multiple NaNbO3/Nb2O5 Heterostructure Nanotubes: A New Class of Ferroelectric/Semiconductor Nanomaterials. Advanced Materials, 22, 1741–1745 (2010). (PDF).
S. Barth, C. Harnagea, S. Mathur, and F. Rosei. The elastic moduli of oriented tin oxide nanowires. Nanotechnology, 20, 115705 (2009). (PDF).
F. Cicoira, C. Santato, A. Dadvand, C. Harnagea, A. Pignolet, P. Bellutti, Z. Xiang, F. Rosei, H. Meng, and D. F. Perepichka. Environmentally stable light emitting field effect transistors based on 2-(4-pentylstyryl)tetracene. Journal of Materials Chemistry, 18, 158–161 (2008). (PDF).
C. Harnagea, C. V. Cojocaru, R. Nechache, O. Gautreau, F. Rosei, and A. Pignolet. Towards ferroelectric and multiferroic nanostructures and their characterisation. International Journal of Nanotechnology, 5, 930–962 (2008). (PDF).
C. V. Cojocaru, A. Bernardi, J. S. Reparaz, M. I. Alonso, J. M. MacLeod, C. Harnagea, and F. Rosei. Site-controlled growth of Ge nanostructures on Si(100) via pulsed laser deposition nanostenciling. Applied Physics Letters, 91, 113112 (2007). (PDF).
C.V. Cojocaru, C. Harnagea, A. Pignolet, and F. Rosei. Nanostenciling of Functional Materials by Room Temperature Pulsed Laser Deposition. IEEE Trans. on Nanotechnology, 5, 470–477 (2006). (PDF).
C.V. Cojocaru, F. Ratto, C. Harnagea, A. Pignolet, and F. Rosei. Semiconductor and Insulator Nanostructures: Challenges and Opportunities. Microel. Eng., 80, 448–456 (2005). (PDF).
C.V. Cojocaru, C. Harnagea, F. Rosei, A. Pignolet, M.A.F. van den Boogart, and J. Brügger. Complex Oxide Nanostructures by Pulsed Laser Deposition through Nanostencils. Appl. Phys. Lett., 86, 183107 (2005). (PDF).