A5059935251- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- Magnetic properties of thin films
- Force Microscopy Techniques and Applications
- Physics of Superconductivity and Magnetism
- GaN-based semiconductor devices and materials
- Nanowire Synthesis and Applications
- Iron-based superconductors research
- ZnO doping and properties
- Characterization and Applications of Magnetic Nanoparticles
- Ga2O3 and related materials
- Magnetic Properties and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum Dots Synthesis And Properties
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Eicosanoids and Hypertension Pharmacology
- Advanced Condensed Matter Physics
- Magnetic Field Sensors Techniques
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- Theoretical and Computational Physics
- Corrosion Behavior and Inhibition
- Advancements in Semiconductor Devices and Circuit Design
- Superconductivity in MgB2 and Alloys
Institute of Electrical Engineering of the Slovak Academy of Sciences
2013-2024
Slovak Academy of Sciences
2014-2024
Centre for Advanced Material Application of the Slovak Academy of Sciences
2023
Comenius University Bratislava
2011-2017
Institute of Electrical Engineering
2004-2014
Slovak University of Technology in Bratislava
2011
Royal Perth Hospital
1980-1983
The University of Western Australia
1981-1983
The $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{B}{\mathrm{i}}_{2}\mathrm{Pd}$ compound has been proposed as another example of a multigap superconductor [Imai et al., J. Phys. Soc. Jpn. 81, 113708 (2012)]. Here, we report on measurements several important physical quantities capable showing presence multiple energy gaps our superconducting single crystals with the critical temperature ${T}_{c}$ close to 5 K. calorimetric study via sensitive ac technique shows sharp anomaly at...
In this work, we systematically studied the influence of plasma treatment (PT) on structural and electrical properties Pt/rutile-TiO2/RuO2 metal–insulator–metal capacitors. The leakage current 12 nm thick TiO2 dielectrics prepared by atomic layer deposition was reduced below 10−7 A cm−2 while capacitance equivalent thickness kept 0.5 using oxygen PT bottom RuO2 electrode. Reflection high energy electron diffraction, transmission microscopy, force microscopy x-ray photoelectron spectroscopy...
This study investigates the impact of a combined approach involving sandblasting and electrochemical surface treatment using deep eutectic solvent Ethaline, mixture choline chloride ethylene glycol, on characteristics Ti–6Al–4V biomedical substrates fabricated through direct selective laser melting (DSLM). Research has focused morphology, topography, chemical composition, cell adhesion. The novel demonstrated ability to create hierarchical structure with both micro nanopatterns. rough edges...
Abstract Carbon nanowalls (CNWs) were grown by atmospheric dc plasma enhanced chemical vapour deposition method. Maintaining at pressure give us possibility to synthetize CNWs high rate. By using two different liquid carbon sources we can control density. Growth of sparsely distributed be achieved ethanol, while hexane gives densely packed films.
We introduce switching magnetization magnetic force microscopy based on two-pass scanning atomic with reversed tip between the scans. Within this approach sum of scanned data depicts local van der Waals forces, while their differences map forces. Here we implement method by fabricating low-momentum probes that exhibit single domain state, which can be easily in low external field during scanning. Measurements high-density parallel and perpendicular recording media show enhanced spatial...
Understanding the stability of magnetic textures in multilayer patterned dots would constitute a significant step toward skyrmion-based applications. Here, we report observation skyrmions nanodots composed multilayers. We examine stabilization various states such as single-domain states, skyrmion horseshoe-like domain structures, and worm-like structures submicrometer (diameters 150–525 nm). Dots are fabricated from Pt/Co/Au that exhibit interfacial Dzyaloshinskii–Moriya interaction...
We describe the technology and performance of integrated enhancement/depletion (E/D)-mode n++GaN/InAlN/AlN/GaN HEMTs with a self-aligned metal-oxide-semiconductor (MOS) gate structure. An identical starting epi-structure was used for both types devices without additional need contacts regrowth. The n++GaN cap layer etched away in trenches E-mode HEMT while it left intact D-mode HEMT. plasma etching process shown to be highly selective between InAlN barrier also polish surface. However,...
We have investigated the magnetization properties and flux dynamics of superconducting Cu${}_{x}$TiSe${}_{2}$ single crystals within a wide range copper concentrations. find that anisotropy is low independent on concentration ($\ensuremath{\gamma}\ensuremath{\sim}1.7$), except in case strongly underdoped samples ($x\ensuremath{\le}0.06$) show gradual increase to $\ensuremath{\gamma}\ensuremath{\sim}1.9$. The vortex phase diagram this material characterized by broad region liquid unusual for...
We report on the properties of metal–insulator–semiconductor (MIS) photoanodes for water oxidation employing a thin RuO2–(IrO2) film as top catalytic layer. In this study, MIS with configurations RuO2/SiO2/n-Si and IrO2–RuO2/SiO2/n-Si were prepared their photoelectrochemical (PEC) oxygen evolution under solar irradiation has been discussed. The SiO2 layers by atomic layer deposition method deposited metal–organic chemical vapor method. photocurrent photovoltage these studied in 1 M aq. H2SO4...
Point-contact Andreev reflection spectroscopy at low temperatures and high magnetic fields has been performed on a noncentrosymmetric $\mathrm{L}{\mathrm{a}}_{3}\mathrm{S}{\mathrm{e}}_{4}$ superconductor with critical temperature ${T}_{\mathrm{c}}=8$ K. Two superconducting energy gaps ${\mathrm{\ensuremath{\Delta}}}_{1}$ ${\mathrm{\ensuremath{\Delta}}}_{2}$, $2{\mathrm{\ensuremath{\Delta}}}_{1}/{k}_{\mathrm{B}}{T}_{\mathrm{c}}\ensuremath{\sim}5.8$...
We analyze the role of electric field distribution in nano-oxidation process realized by tip atomic force microscope (AFM) experimentally and theoretically as well. show importance sample conductivity water bridge applied to bulk GaAs Ga[Al]As heterostructures both contact noncontact AFM modes. The experimental results that lines written mode are much wider then those mode. Moreover, saddlelike profile can appear for high-resistive samples. These effects explained numerical simulations using...
Standard magnetic force microscopy (MFM) is considered as a powerful tool used for field imaging at nanoscale. The method consists of two passes realized by the tip. Within first one, topography pass, tip directly touches sample. Such contact perturbs magnetization sample explored. To avoid touching tip, we present new approach to scanning segregating topological and scans with different tips located on cut cantilever. minimizes disturbance magnetization, which could be major problem in...
We present a detailed study of the phase diagram copper intercalated TiSe$_2$ single crystals, combining local Hall-probe magnetometry, tunnel diode oscillator technique (TDO), specific-heat, and angle-resolved photoemission spectroscopy measurements. A series Cu$_x$TiSe$_2$ samples from three different sources with various content $x$ superconducting critical temperatures $T_c$ have been investigated. first show that vortex penetration mechanism is dominated by geometrical barriers enabling...
Transparent conducting Al-doped ZnO films were grown by atomic layer deposition (ALD). Al-doping was introduced inserting 1 Al2O3 cycle per 28 cycles. The x-ray photoelectron spectroscopy showed that the density of Al donors is 2×1021–3×1021 cm−3, while Hall-effect measurements a ten times lower electron density. This low doping efficiency well-known inherent problem ALD method, and we wanted to explain its origin. We have found reduced traps at grain surface; however, effect too weak...
We have developed a micromachined Hall sensor for scanning the entire magnetic field vector whose active dimensions are an order of magnitude smaller (∼5 μm) than smallest existing sensor. It is realized by patterning three probes on tilted faces epitaxy-overgrown GaAs-based pyramidal-shaped mesa structures. Data from these “tilted” used to reconstruct full vector.
An artificial ``multigranular'' YBCO thin film has been prepared by patterning a network of gridlines, emulating the current-restricting behavior grain boundaries. This model system allowed us to investigate magnetic effects granularity and current percolation problem, having control on geometry, number grains, ratio inter-to-intragrain critical-current density reduction, ${J}_{c}^{\mathrm{GB}}∕{J}_{c}^{\mathrm{G}}$. The dc magnetization cycle at $5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$...