Article
Physics, Applied
Jangseop Lee, Sangmin Lee, Hyunsang Hwang
Summary: The study investigated the effect of active switching area on the electrical characteristics of an ovonic threshold switching (OTS) device. By utilizing a controlled breakdown of an ultrathin HfO2 interlayer to form a nanometer-scale virtual electrode, improvements in switching characteristics were observed when the effective diameter of the virtual electrode was around 6nm. Optimal confinement of the active switching area was found to be crucial for achieving excellent performance, high reliability, and high tunability in an OTS device.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Ceramics
Meshari Alotaibi, Fawaz Almutairi, Anthony R. West
Summary: Yttria-stabilized hafnia ceramics exhibit unique electrical conductivity at high temperature and under applied bias, with reversible switching behavior.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Guiqian Fang, Huimin Chen, Xintian Shao, Han Wang, Dongxue Zhan, Ran Wang, Peng Meng, Hongbao Fang, Fei Liu, Peixue Ling, Zhongyu Wu, Jiajie Diao, Qingqiang Yao, Qixin Chen
Summary: This research develops a strategy to convert dynamic events into static images, using the color transformation of a single molecular probe to visualize bioactive ion exchange between organelles in live cells. By studying the distribution of reactive sulfur species at mitochondria-lysosome contact sites, it provides the first evidence of their involvement in inter-organelle contacts and communication.
Article
Engineering, Multidisciplinary
Alban de Vaucorbeil, Vinh Phu Nguyen
Summary: The paper introduces a contact algorithm for the Total Lagrangian Material Point Method (TLMPM) that can model contacts with or without friction. Through testing in five different scenarios, it is found that compared to the standard MPM, TLMPM has a smoother stress field, no gap between contacting surfaces, and less error in predicting forces.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Yifei Yang, Mingkun Xu, Shujing Jia, Bolun Wang, Lujie Xu, Xinxin Wang, Huan Liu, Yuanshuang Liu, Yuzheng Guo, Lidan Wang, Shukai Duan, Kai Liu, Min Zhu, Jing Pei, Wenrui Duan, Dameng Liu, Huanglong Li
Summary: The development of resistive switching devices based on tellurium filaments offers a solution to the perennial current-volatility dilemma, with the potential to function as selectors or memories and unique design space. Preliminary optimization efforts indicate a promising outlook for Te-based resistive switching devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Borja Cirera, Martin Wolf, Takashi Kumagai
Summary: The research demonstrates the direct observation of vibrational heating in a single C60 molecule using TERS, revealing qualitatively different heating mechanisms in distinct electron transport regimes. Strong Joule heating occurs in the SMPC regime, while optical heating is predominant in the tunneling regime.
Article
Chemistry, Multidisciplinary
Lucas Frerot, Alexia Crespo, Jaafar A. El-Awady, Mark O. Robbins, Juliette Cayer-Barrioz, Denis Mazuyer
Summary: The required tangential force for slip across a frictional interface can increase due to aging processes, including creep, chemical, or structural changes. In this study, the interplay between surface roughness and molecular motion within adsorbed monolayers explains the macroscopic friction response. Contact junctions and their dynamics are studied experimentally and computationally to understand their role in structural aging.
Article
Chemistry, Multidisciplinary
Andriy Savytskyi, Alexander Pospelov, Anna Herus, Volodymyr Vakula, Nataliya Kalashnyk, Eric Faulques, Gennadii Kamarchuk
Summary: A portable device for researching and manufacturing dendritic Yanson point contacts and quantum sensing was developed. The device allows for the creation of these contacts and the study of their quantum properties, which are evident in the electrochemical cyclic switchover effect. The device can gather data on the compositions and characteristics of synthesized substances, as well as provide information on the electrochemical and electrophysical processes involved.
Article
Chemistry, Multidisciplinary
Kelvin Yao, Felix Steinbach, Martin Borchert, Daniel Schick, Dieter Engel, Filippo Bencivenga, Riccardo Mincigrucci, Laura Foglia, Emanuele Pedersoli, Dario De Angelis, Matteo Pancaldi, Bjorn Wehinger, Flavio Capotondi, Claudio Masciovecchio, Stefan Eisebitt, Clemens von Kor Schmising
Summary: Researchers have demonstrated the ultrafast emergence of all-optical switching on the nanometer length scale by exciting transient magnetic gratings in a GdFe alloy using interfered coherent femtosecond light pulses in the extreme ultraviolet spectral range, and probing the subsequent evolution of the magnetization pattern through diffraction techniques.
Article
Materials Science, Ceramics
M. Kamran, M. Anis-ur-Rehman
Summary: This study investigates the electrical properties of cerium-doped Co-ferrite nanoparticles and discovers their resistive switching effect. With increasing cerium substitution, the resistance, drift mobility, and dielectric constant decrease, while the activation energy increases. The study also finds that the sample with a cerium composition of x = 0.25 exhibits a larger hysteresis loop, making it suitable for nonvolatile ReRAM applications.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Hee Won Suh, Dong Su Kim, Ji Hoon Choi, Hak Hyeon Lee, Kun Woong Lee, Sung Hyeon Jung, Won Seok Yang, Jeong Jae Kim, Ji Sook Yang, Ho Seong Lee, Hyung Koun Cho
Summary: In this study, a unique crossbar array structure was proposed, which can be independently driven through the novel design of a multilayer RRAM. The ANPs-Cu2O active layers prepared by electrodeposition showed different set voltages and uniform reset voltages. The VCu-controlled DALs effectively prevented reverse current and achieved selector-less RRAM. The experimental results demonstrated that the array exhibited excellent memory performance and endurance without interfering with adjacent cells.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Mechanical
S. Li, A. Kolivand, Z. Shi, A. Anisetti
Summary: This study proposes a modeling methodology to describe the tribo-dynamic behavior of generic point contacts with surface defect/failure excitation. Experimental tests using a twin-disk contact set-up show that the passage of an artificial surface defect through the lubricated contact zone leads to fluctuations in contact force, dynamic relative displacement, and velocity. These dynamic responses affect the lubrication film thickness and flow, altering the tribological performance that governs the contact force. Computational simulations demonstrate fairly accurate predictions compared to measured acceleration signals.
NONLINEAR DYNAMICS
(2023)
Article
Chemistry, Multidisciplinary
Lei Yin, Ruiqing Cheng, Shurong Pan, Wenqi Xiong, Sheng Chang, Baoxing Zhai, Yao Wen, Yuchen Cai, Yuzheng Guo, Marshet Getaye Sendeku, Jian Jiang, Weitu Liao, Zhenxing Wang, Jun He
Summary: This study reports the scalable atomic-scale patterning in 2D superionic cuprous telluride and demonstrates controllable piezoelectricity-like multilevel switching and bipolar switching, as well as their application in image enhancement. The research expands the known classes of patternable crystals and atomic switching devices, and opens up a new frontier for image processing with memristors.
ADVANCED MATERIALS
(2023)
Article
Computer Science, Information Systems
Mamathamba Kalishettyhalli Mahadevaiah, Eduardo Perez, Marco Lisker, Markus Andreas Schubert, Emilio Perez-Bosch Quesada, Christian Wenger, Andreas Mai
Summary: In this study, the resistive switching properties of HfO2 based 1T-1R memristive devices were modified by adding ultra-thin layers of Al2O3. Three different types of memristive stacks were fabricated and the switching properties were discussed in terms of forming voltages, low resistance state, high resistance state, and their variabilities. The experimental I-V characteristics of set and reset operations were evaluated using the quantum point contact model, and the properties of the conduction filament in the on and off states were discussed based on the model parameters obtained from the QPC fit.
Article
Chemistry, Multidisciplinary
Evgeny V. Emelin, Hak Dong Cho, Vitaly I. Korepanov, Liubov A. Varlamova, Darya O. Klimchuk, Sergey V. Erohin, Konstantin V. Larionov, Deuk Young Kim, Pavel B. Sorokin, Gennady N. Panin
Summary: This study investigates the resistive switching behavior of a composite structure composed of bilayer graphene and 2D diamond nanostructures, and explores the impact of electric field on the nanostructures.
Article
Nanoscience & Nanotechnology
Serhii Volkov, Maros Gregor, Tomas Plecenik, Elena Zhitlukhina, Mikhail Belogolovskii, Andrej Plecenik
Summary: Point-contact Andreev spectroscopy is a powerful technique for obtaining quantitative information on the electronic properties of a superconductor, but measurements often reveal unexpected conductance features that cannot be adequately explained by conventional theory, particularly conductance dips at slightly higher voltage biases than the expected energy gap for a superconductor.
APPLIED NANOSCIENCE
(2022)
Article
Physics, Applied
Michaela Sojkova, Jana Hrda, Serhii Volkov, Karol Vegso, Ashin Shaji, Tatiana Vojtekova, Lenka Pribusova Slusna, Norbert Gal, Edmund Dobrocka, Peter Siffalovic, Tomas Roch, Maros Gregor, Martin Hulman
Summary: The study reported the fabrication of a few-layer PtSe2 film on top of an NbN substrate by selenization of pre-deposited Pt layers, successfully preserving the chemical and structural integrity. It was found that the alignment of the PtSe2 film can be tuned by varying the nitrogen flow rate, with the superconducting critical temperature of NbN slightly reduced in the optimized samples.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
T. Roch, M. Gregor, S. Volkov, M. Caplovicova, L. Satrapinskyy, A. Plecenik
Summary: This study examined the impact of different substrates on the structure and orientation of niobium nitride thin films, revealing that films on C-Al2O3 substrate exhibited the best superconducting properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Coatings & Films
Tomas Fiantok, Viktor Sroba, Nikola Koutna, Vitalii Izai, Tomas Roch, Martin Truchly, Marek Vidis, Leonid Satrapinskyy, Stefan Nagy, Branislav Grancic, Peter Kus, Marian Mikula
Summary: Alloying with aluminum significantly affects the thermally induced structure evolution and mechanical properties of alpha-structured zirconium diboride films. Aluminum forms a nanocomposite structure with zirconium diboride, but is insoluble in the zirconium diboride phase. Alloying with aluminum decreases the hardness, but after annealing, the hardness slightly increases due to increased point defects at the boundaries. The Young's modulus decreases with aluminum alloying.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Engineering, Electrical & Electronic
Pavol Durina, Tomas Plecenik, Tomas Roch, Veronika Medvecka, Martin Truchly, Branislav Granc, Anna Zahoranova, Andrej Plecenik
Summary: Self-assembled monolayers of micro- or nanospheres deposited from a colloid on material surfaces can be used to fabricate nanopatterns without costly lithographic equipment. A cost-effective and fast method of fabrication of large-area continuous monolayers of polystyrene (PS) spheres has been demonstrated, and possible applications of this method have been presented.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Coatings & Films
Marek Vidis, Martin Truchly, Vitalii Izai, Tomas Fiantok, Tomas Roch, Leonid Satrapinskyy, Viktor Sroba, Pavol Durina, Stefan Nagy, Peter Kus, Marian Mikula
Summary: The effect of vacuum annealing on the chemical composition, nanostructure, and mechanical properties of YB4.7 thin films was investigated. The annealing process resulted in structural transformations, increased hardness, and crack propagation. The findings suggest that introducing YB4.7 films into multilayer systems can enhance overall thermal shock resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Elena Zhitlukhina, Magdalena Polackova, Serhii Volkov, Branislav Grancic, Maros Gregor, Tomas Plecenik, Mikhail Belogolovskii, Paul Seidel, Andrej Plecenik
Summary: Manipulating vortex matter in nanometer-thin type-II superconducting layers is important for the performance of superconducting devices. By immobilizing magnetic flux lines through natural or artificially introduced pinning sites, or by using a nanometer-thin ferromagnetic film in close proximity, the transport characteristics can be preserved. Our research focuses on coupled metallic multilayers composed of weak diluted ferromagnetic (NiCu) and superconducting (NbN) films. By measuring current-voltage curves, we observe a strong growth of the critical current in certain configurations, accompanied by moderate changes in the critical temperature or their absence. This effect, known as magnetic pinning, can be enhanced by magnetization engineering to optimize the pinning strength in desired field ranges.
APPLIED NANOSCIENCE
(2022)
Article
Materials Science, Coatings & Films
Viktor Sroba, Tomas Fiantok, Martin Truchly, Tomas Roch, Branislav Grancic, Katarina Viskupova, Leonid Satrapinskyy, Peter Svec Jr, Stefan Nagy, Vitalii Izai, Peter Kus, Marian Mikula
Summary: Alloying transition metal diborides with other metals is a suitable method to maintain their excellent mechanical properties under high-temperature loads. This study focuses on the aluminum alloying effect on the thermal-induced structural evolution and mechanical properties of alpha-Ta1-xAlxB2. Experimental results confirm the insolubility of aluminum in the TaB2 phase, forming a nanocomposite structure of alpha-TaB2 nanofilaments surrounded by an Al-rich tissue phase. Al alloying leads to a decrease in hardness and a tendency toward ductile behavior under mechanical load.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Physics, Multidisciplinary
Magdalena Polackova, Elena Zhitlukhina, Mikhail Belogolovskii, Maros Gregor, Tomas Plecenik, Paul Seidel
Summary: The four-point probe is a simple method for measuring thin-layer surface resistance. It can measure resistivity regardless of the resistance of the contacts, which is important for large and non-ohmic contacts. However, the results are dependent on sample geometry and probe position, leading to incorrect conclusions in some cases.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Bilal Hanif, Guru Karthikeyan Thirunavukkarasu, Viktoriia Liapun, Hryhorii Makarov, Maros Gregor, Tomas Roch, Tomas Plecenik, Karol Hensel, Marcel Sihor, Olivier Monfort, Martin Motola
Summary: This study presents an environmentally friendly synthesis of TiO2 nanotube (TNT) layers and demonstrates their photocatalytic performance and HO radical production rate. The best preparation condition was using AgNO3 as the electrolyte, which resulted in TNT layers with suitable morphological features and crystal structure.
Article
Chemistry, Physical
Marcel Sihor, Muhammad Bilal Hanif, Guru Karthikeyan Thirunavukkarasu, Viktoriia Liapun, Miroslava Filip Edelmannova, Tomas Roch, Leonid Satrapinskyy, Tomas Plecenik, Sajid Rauf, Karol Hensel, Olivier Monfort, Martin Motola
Summary: This study demonstrates the facile and scalable fabrication of large-area TiO2 nanostructures via electrochemical anodization, with excellent photocatalytic activity and hydrogen production. The formation of different TiO2 nanostructures with varied morphology and performance at different applied potentials was observed. The highest caffeine photodegradation and hydrogen production rates were achieved using specific TiO2 nanostructures. This work highlights the potential strategy for the synthesis of large-area anodic TiO2 nanostructures for efficient photocatalysis and hydrogen production.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)