Article
Nuclear Science & Technology
E. Pitthan, P. Petersson, T. T. Tran, D. Moldarev, R. Kaur, J. Shams-Latifi, P. Strom, M. Hans, M. Rubel, D. Primetzhofer
Summary: Sputter-deposited thin films (33-1160 nm) from EUROFER97 were obtained and analyzed on different substrates (C, Si, W, MgO) in argon and a mix of argon and deuterium atmosphere. The films exhibited lower density, higher hardness, and smaller crystallites compared to the bulk material, while their atomic composition was similar. Deposition in a deuterium-containing atmosphere resulted in low deuterium incorporation, suggesting low retention of hydrogen-isotopes.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Chemistry, Physical
Simon Hurand, Alan Corvisier, Bertrand Lacroix, Antonio Jesus Santos, Florian Maudet, Cyril Dupeyrat, Rafael Garcia Roja, Francisco Miguel Morales, Thierry Girardeau, Fabien Paumier
Summary: This paper investigates the anisotropic optical properties of nanometer-scale structured thin films by combining Mueller matrix spectroscopic ellipsometry and high-resolution transmission electron microscopy. The study finds that, in the visible-near infrared range, the films exhibit a ripple-like structure with higher optical index perpendicular to the slanting plane. In the infrared range, the films deposited with xenon show strong optical anisotropy due to the anisotropic free-carrier scattering within the nanoscopic sub-columnar structure.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
J. P. B. Silva, K. C. Sekhar, R. F. Negrea, C. Ghica, D. Dastan, M. J. M. Gomes
Summary: This work investigates the ferroelectric characteristics of ZrO2 thin films grown on ITO-coated glass. It is found that the ferroelectric nature of the ZrO2 films is optimized through rapid thermal annealing at 600 degrees C. The increase in annealing temperature improves the ferroelectric properties by increasing the in-plane strain. The effect of electric field on the polarization switching kinetics of ZrO2 films is also studied.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Jose P. B. Silva, Raluca F. Negrea, Marian C. Istrate, Sangita Dutta, Hugo Aramberri, Jorge Iniguez, Fabio G. Figueiras, Corneliu Ghica, Koppole C. Sekhar, Andrei L. Kholkin
Summary: Zirconia- and hafnia-based thin films have attracted significant attention due to their ferroelectric behavior at the nanoscale. This study reveals a new ferroelectric rhombohedral phase of ZrO2 in thin films grown on (111)-Nb:SrTiO3 substrates, exhibiting high ferroelectric polarization and low coercive field with characteristics in agreement with the nucleation limited switching (NLS) model for ferroelectric domain reversal.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Condensed Matter
Roshni Yadav, Michael Shepit, Xu Li, Ko-Wei Lin, Johan van Lierop, Antonio Ruotolo
Summary: The photo-spin-voltaic effect is observed when a non-magnetic metal is in close proximity to a ferrimagnetic insulator, generating a spin voltage from photons. By depositing a metallic layer on a specific substrate, the photo-induced voltage effect can be observed, with the voltage sign switching with magnetic field polarity and decreasing in intensity with increasing thickness of the metal layer. This design shows potential applications in antiferromagnetic spintronics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Jose P. B. Sliva, Marian C. Istrate, Markus Hellenbrand, Atif Jan, Maximilian T. Becker, Joanna Symonowicz, Fabio G. Figueiras, Veniero Lenzi, Megan O. Hill, Corneliu Ghica, Konstantin N. Romanyuk, Maria J. M. Gomes, Giuliana Di Martino, Luis Marques, Judith L. MacManus-Driscoll
Summary: A new method for stabilizing ferroelectric o-ZrO2 films with negative piezoelectric coefficient is demonstrated by growing -8nm thick films using ion-beam sputtering. The films on (011)-Nb:SrTiO3 showed oriented o-phase and exhibited ferroelectric behavior, while films on (001)-Nb:SrTiO3 showed mixed m and o-phases with inferior ferroelectric properties. Density functional theory calculations support the experimental findings and explain the negative piezoelectric coefficient.
APPLIED MATERIALS TODAY
(2023)
Article
Materials Science, Multidisciplinary
Shaobo Fang, Chong Ma, Weiming Liu, Junbo He, Cheng Wang, Gang Chen, Dingquan Liu, Rongjun Zhang
Summary: This study systematically investigated the optical, structural, and compositional properties of HfO2 films prepared by dual ion beam sputtering deposition. The oxygen flow rates of the assist ion source and vacuum chamber significantly affect the properties of the film, leading to different refractive index and roughness. This research is important for choosing proper oxygen flow parameters for the fabrication of hafnium oxide films for various applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Thomas Gischkat, Max Dobeli, Andreas Bachli, Roelene Botha, Zoltan Balogh-Michels
Summary: The wetting properties of ion-beam-sputtered Yttria thin films were investigated in this work, with water contact angles ranging from 67 to 96 degrees. The concentration of embedded argon atoms was found to influence the contact angle.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Chang Gao, Yujing Ran, Qian Guo, Tianrun Wang, Huiping Lu, Zhaotan Jiang, Zhi Wang
Summary: NbNx films were prepared by dual ion beam sputter deposition to modulate their structural and dielectric properties. Assisting ions can improve crystallinity, reduce energy loss, and lead to tunable dual epsilon-near-zero behavior in the films. Tailoring plasmonic properties with assisting ions allows NbNx films to be applied in various fields.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Aleksei Almaev, Nikita N. Yakovlev, Bogdan O. Kushnarev, Viktor V. Kopyev, Vadim A. Novikov, Mikhail M. Zinoviev, Nikolay N. Yudin, Sergey N. Podzivalov, Nadezhda N. Erzakova, Andrei Chikiryaka, Mikhail P. Shcheglov, Houssain Baalbaki, Alexey S. Olshukov
Summary: This study investigates the electrical conductivity and gas response of TiO2 films deposited using IBSD at high temperatures. It is found that annealing temperature affects the response and recovery of the films, and the response to different gases can be controlled by varying the annealing conditions and film thickness.
Article
Materials Science, Coatings & Films
N. Sala, M. D. Abad, J. C. Sanchez-Lopez, J. Caro, C. Colominas
Summary: Nanostructured Nb-C thin films were prepared by DC-MS and HiPIMS, with different microstructures and hardness values observed. The formation of lubricating carbon tribofilm during wear tests was observed, particularly on samples prepared by HiPIMS with higher carbon content.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Radhe Shyam, Deepak Negi, Komal Shekhawat, Fouran Singh, Devarani Devi, Pargam Vashishtha, Govind Gupta, Subingya Pandey, Pamu Dobbidi, Srinivasa Rao Nelamarri
Summary: The present study demonstrates the tuning of structural, topography, and luminescence properties of 30 keV Li-ion implanted (K, Na)NbO3 thin films synthesized using RF sputtering. The results show that the crystallinity and morphology of the films are affected by Li-ion implantation, with a decrease in crystallinity and a change in the morphology. The transmittance of the films is minimally improved, while the optical band gap and the relative PL intensity in the ultraviolet region are increased with the ion fluence. The carrier lifetime is also increased after ion implantation.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Susmita Chowdhury, Rachana Gupta, Shashi Prakash, Layanta Behera, D. M. Phase, Mukul Gupta
Summary: The study investigates the effects of tunable synthesis parameters and Ti interface on the properties of TiN thin films deposited by ion beam sputtering. Through adjusting the partial pressure of N-2 gas, ion energy, and the presence of a Ti interface, dense and smooth TiN films with low resistivity were achieved. The study demonstrates the importance of these factors in optimizing the growth of TiN thin films without the need for high temperatures or substrate biasing.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Hugh Littlehailes, William R. Hendren, Stacey Drakeley, Robert M. Bowman, Fumin Huang
Summary: The optical properties of refractory intermetallic thin films of Au3Zr were experimentally investigated for the first time, showing distinctive plasmonic properties. The films' structural and optical properties were found to be critically dependent on deposition temperature and anneal conditions, with films deposited between 205 and 320 degrees C exhibiting better thermal stability. Oxidization was identified as a restricting issue for high-temperature applications in ambient environment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
Tyler Evans, Scott Norris
Summary: The study finds that ion-beam irradiation of semiconductor surfaces can lead to nanopattern formation, and the inclusion of a swelling mechanism in the model is essential for understanding the suppression of ripples. The stability profile remains largely similar for arbitrary swelling rates, indicating that the small-swelling limit is an adequate approximation for the full mechanism.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Coatings & Films
Dmitry Kalanov, Andre Anders, Carsten Bundesmann
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2019)
Article
Materials Science, Coatings & Films
Kyunghwan Oh, Dmitry Kalanov, Andre Anders, Carsten Bundesmann
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2020)
Article
Materials Science, Coatings & Films
Thomas Amelal, Lukas Pietzonka, Erik Rohkamm, Carsten Bundesmann
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2020)
Article
Chemistry, Analytical
Olesya Daikos, Mirko Naumann, Katrin Ohndorf, Carsten Bundesmann, Ulrike Helmstedt, Tom Scherzer
Summary: This research used hyperspectral imaging to determine the thickness of thin layers of the conductive polymer PEDOT:PSS, predicted thickness data using a chemometric approach, and established a calibration model with high accuracy. The method was validated for quantitative imaging of thickness distribution in thin layers.
Article
Materials Science, Coatings & Films
Carsten Bundesmann, Jens Bauer, Annemarie Finzel, Juergen W. Gerlach, Wolfgang Knolle, Anke Hellmich, Ron Synowicki
Summary: Indium tin oxide (ITO) thin films were grown by Ar ion beam sputter deposition with systematic variations in ion energy, geometrical parameters, and O-2 background pressure. The growth rate and electrical resistivity behavior were found to be influenced by ion energy, ion incidence angle, and O-2 background pressure. Optical characterization suggested a similar systematics in the film growth process.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Materials Science, Coatings & Films
Dmitry Kalanov, Andre Anders, Carsten Bundesmann
Summary: The energy distributions of secondary ions for ion beam sputtering of a Ga2O3 target using O2+ and Ar+ ions were measured and found to be influenced significantly by the sputtering geometry and the energy of incident ions for Ga+ and O+ ions. The formation of O2+ ions was attributed to collisions with background gas molecules. Increasing O2 pressure led to a minor decrease in the energy of Ga+ ions due to collisions with background gas particles. The use of primary Ar+ ions with O2 background pressure did not show any major effect on the energy distributions of Ga+, O+ and O2+ ions.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Instruments & Instrumentation
Carsten Bundesmann, Christoph Eichhorn, Horst Neumann, Frank Scholze, Daniel Spemann, Michael Tartz, Hans J. Leiter, Roman Y. Gnizdor, Fabrizio Scortecci
Summary: This paper presents two tools for in situ erosion measurements of electric propulsion thrusters, which can improve testing efficiency and reliability. The capabilities and limitations of these techniques are demonstrated for different types of thrusters.
EPJ TECHNIQUES AND INSTRUMENTATION
(2022)
Article
Physics, Condensed Matter
Jacques Bernstein, Juergen W. Gerlach, Annemarie Finzel, Carsten Bundesmann
Summary: SiO2 thin films were grown by ion beam sputter deposition using oxygen ions under systematic variation of ion energy and geometrical parameters. The films were found to be amorphous with a certain level of surface roughness and mass density. Optical properties showed minimal variations, while the refractive index exhibited different trends with varying ion energy and incidence angle.
EUROPEAN PHYSICAL JOURNAL B
(2022)
Article
Materials Science, Coatings & Films
Dmitry Kalanov, Yeliz Unutulmazsoy, Daniel Spemann, Jens Bauer, Andre Anders, Carsten Bundesmann
Summary: In this study, gallium oxide thin films were grown on Si substrates at room temperature using ion beam sputter deposition (IBSD). The impact of various process parameters on the film properties was investigated. It was found that higher energy film-forming species resulted in improved film stoichiometry and correlated with higher mass density and better optical properties.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Instruments & Instrumentation
Christoph Eichhorn, Lukas Pietzonka, Frank Scholze, Carsten Bundesmann, Daniel Spemann, Horst Neumann, Hans J. Leiter
Summary: Methods based on laser-induced fluorescence spectroscopy are widely used for non-intrusive diagnostics in plasma applications, including measurements of atomic or molecular densities and velocity distributions. In the field of electric space propulsion, the focus is on studying rare gases such as xenon or krypton, which are currently preferred propellants in gridded ion- and Hall-effect thrusters. Diagnostics of neutral atoms is particularly important for gridded ion engines, as charge-exchange processes between neutrals and ions drive accelerator grid erosion and limit the thruster's lifetime. Recent advancements in single- and two-photon absorption laser-induced fluorescence diagnostics have allowed for measurements of krypton and xenon neutrals in the plume of a radiofrequency ion thruster and within the discharge chamber of a gridded radiofrequency ion source.
EPJ TECHNIQUES AND INSTRUMENTATION
(2022)
Article
Materials Science, Multidisciplinary
Lukas Botsch, Pablo D. Esquinazi, Carsten Bundesmann, Daniel Spemann
Summary: In recent years, there has been a trend towards developing ferromagnetic materials by introducing defects into nonmagnetic host materials. However, the controversy remains regarding whether these materials are technologically relevant ferromagnets. Research on the emergence of a ferromagnetic phase upon ion irradiation shows that a bulk magnetic phase emerges in the high-energy regime, while an ultrathin magnetic layer forms at low ion energies.
Article
Engineering, Electrical & Electronic
Carsten Bundesmann, Anke Hellmich
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
Article
Materials Science, Multidisciplinary
Markus Stiller, Alpha T. N'Diaye, Hendrik Ohldag, Jose Barzola-Quiquia, Pablo D. Esquinazi, Thomas Amelal, Carsten Bundesmann, Daniel Spemann, Martin Trautmann, Angelika Chasse, Hichem Ben Hamed, Waheed A. Adeagbo, Wolfram Hergert
Article
Engineering, Mechanical
Carsten Bundesmann
VAKUUM IN FORSCHUNG UND PRAXIS
(2019)
Article
Engineering, Aerospace
Christoph Eichhorn, Frank Scholze, Carsten Bundesmann, Daniel Spemann, Horst Neumann, Hans Leiter
JOURNAL OF PROPULSION AND POWER
(2019)