Nuclear fusion technologies have re-gained momentum in the last decade thanks to their disruptive potential different fields, such as energy production and space propulsion, new technological developments, especially high temperature superconductor tapes, which allow overcoming previous performance or design limits. To date, reviews of recent nuclear designs are lacking. Therefore, this paper aims at giving a comprehensive overview concepts for industrial applications with focus on private...

This work deals with the synthesis and characterization of novel Fe-containing sol-gel materials obtained by modifying composition a binary SiO2-CaO parent glass addition Fe2O3. The effect different processing conditions (calcination in air vs. argon flowing) on formation magnetic crystalline phases was investigated. produced were analyzed from thermal (hot-stage microscopy, differential analysis, calorimetry) microstructural (X-ray diffraction) viewpoints to assess both behavior upon...

Zinc oxide nanoparticles (ZnO NPs) are currently among the most promising nanomaterials for theranostics. However, they suffer from some drawbacks that could prevent their application in nanomedicine as theranostic agents. The doping of ZnO NPs can be effectively exploited to enhance already-existing properties and introduce completely new functionalities doped material. Herein, we propose a novel synthetic approach iron-doped (Fe:ZnO) multifunctional nanoplatform aimed at cancer cell...

We report on the analysis method to extract quantitative local electrodynamics in superconductors by means of magneto-optical technique. First all, we discuss calibration procedure convert light intensity values into magnetic induction field distribution and start focusing role played generally disregarded components parallel indicator film plane (in-plane effect). To account for reliability whole technique, used reconstruct electrical current density is reported, together with a numerical...

The development of high temperature superconducting tape technology enabled the design compact fusion reactors, allowing faster in field. reduced size makes even more important evaluation neutron flux on all components and at every region, including magnet position, to assess lifetime materials their performances during operations. Compactness, however, introduces new technological challenges, considering space available for shielding consequently harsher radiation environment both...

Abstract Energy production by nuclear fusion can be the breakthrough in decarbonisation process, and high temperature superconductors (HTS) represent a game changer for design of compact reactors. However, reduced size implies that superconducting tapes will exposed to an intense flux neutrons secondary particles while carrying current; order employ HTS reactors it is therefore crucial precisely assess effects irradiation on at working conditions. To achieve this goal, researchers from...

One of the open issues concerning iron-based superconductors is whether s± wave model able to account for overall effects impurity scattering, including low rate decrease critical temperature with concentration. Here we investigate Ba1-x K x Fe2As2 crystals where disorder introduced by Au-ion irradiation. Critical temperature, T c , and London penetration depth, λ L were measured a microwave resonator technique, different values irradiation fluence. We compared experimental data calculations...

Abstract We investigate the neutron damage expected in high-temperature superconducting tapes that will be employed compact fusion reactors. Monte Carlo simulations yield spectrum and fluence at magnet position, from which primary knock-on atom energy distributions can computed for each atomic species comprising superconductor. This information is then to characterize displacement cascades, terms of size morphology, through molecular dynamics simulations. The radiation environment compared...

The electrochemical gating technique is a powerful tool to tune the \textit{surface} electronic conduction properties of various materials by means pure charge doping, but its efficiency thought be hampered in with good screening. We show that, if applied metallic superconductor (NbN thin films), this approach allows observing reversible enhancements or suppressions \emph{bulk} superconducting transition temperature, which vary thickness films. These results are interpreted terms proximity...

Hyperthermia is a technique for destroying cancer cells which involves the exposition of body's tissue to controlled heat, normally between 41℃ and 46℃. It has been reported that ferro- or ferrimagnetic materials can heat locally, if they are placed (after being implanted) under an alternating magnetic field, damaging only tumoral not healthy ones. The power loss produced by be dissipated in form heat. This phenomenon regulated order obtain temperature inside tissues. material was...

Zinc oxide nanocrystals (ZnO-NCs) doped with transition metal elements or rare earth can be probed for magnetic resonance imaging to used as a molecular technique accurate diagnosis of various diseases. Herein, we use Mn candidate and Gd presenter elements. We report an easy fast coprecipitation method exploiting oleic acid synthesize spherical-shaped, small-sized ZnO-NCs. show the improved colloidal stability oleate-stabilized ZnO-NCs compared synthesized by conventional sol–gel synthesis...

We present the experimental observation of magnetic field line curvature at surface a superconducting film by local quantitative magneto-optics. In addition to knowledge full induction superconductor yielding flux curvature, our analysis method also allows value measurements electrical current density inside sample. Thus, we study interplay between electrodynamical constraints dictated geometry and pinning properties superconductor. particular, investigate anisotropic vortex pinning, due...

In recent decades the applications of nanotechnology in biomedical field have attracted a lot attention. Magnetic and gold nanoparticles (MNPs GNPs) are now interest as selective tools for tumour treatment, due to their unique properties biocompatibility. this paper, superparamagnetic iron oxide (MNPs) decorated with (GNPs) been prepared by means an innovative synthesis process using tannic acid reducing agent. The as-obtained nanoplatforms were characterized terms size, morphology,...

We measure current-voltage characteristics as function of magnetic field and temperature in Nb strips different thickness width. The instability voltage the flux flow state related to vortex critical velocity v* is studied compared with Larkin-Ovchinnikov theory. Beside usual power-law dependence ~ B^-1/2, low range a new cross-over field, Bcr1, observed below which decreases by further lowering external B. ascribe this unexpected channeling due fan-like penetration applied confirmed...

Channels with micron-size width have been carved in Y Ba2Cu3O7−x (YBCO) coplanar microwave resonators by micro-collimated swift heavy-ion irradiation at high fluences. The response of the as a function temperature, magnetic field and input power well magneto-optical imaging was used to characterize properties such micro-channels. method proposed channels—with dimensions from 1/3200 1/178 wavelength—is based on comparison between fundamental first harmonic resonant modes. As expected due...

The electrodynamic response of Ba1−xKxFe2As2 single crystals at the microwave frequencies has been investigated by means a coplanar resonator technique, different values non-magnetic disorder introduced into samples heavy-ion irradiation. surface impedance Zs = Rs + iXs conforms to classical skin effect above critical temperature. Below Tc, monotonically decreases while Xs shows peak, which evolves as function irradiation fluence. disorder-dependent Zs(T) curves are analyzed within two-fluid...

We report on the introduction of columnar defects in Ba1−xKxFe2As2 and BaFe2(As1−xPx)2 single crystals via 1.2 GeV Pb irradiation. Scanning transmission electron microscopy analysis proves formation continuous along ion tracks, with a diameter about 3 nm, planar density compatible irradiation fluence. The twofold role such defects, i.e. as pair breakers well pinning centers, is investigated by microwave technique, allowing us to determine critical temperature Tc, surface impedance...

The microwave properties of polycrystalline $\mathrm{Mg}{\mathrm{B}}_{2}$ thin films prepared by the so-called in situ method are investigated. characterization at frequencies was obtained a coplanar resonator technique. analysis experimental data results determination penetration depth, surface impedance, and complex conductivity. aim this work is to set consistent framework, involving two-band model presence impurity scattering. energy gaps calculated contribution intra- interband...

The influence of dendritic magnetic-flux penetration on the microwave response superconducting MgB2 films is investigated by a coplanar resonator technique. peculiar feature consists jumps in resonance curve, induced vortex avalanches freezing flux inside resonator. Due to shaking effect, currents maintain system close nonequilibrium state, resulting dendrite branching. Avalanche-size distributions before and after flux-pinning tailoring heavy-ion irradiation are fully consistent with...

We studied magnetic flux penetration in a hybrid MgB2/Fe structure consisting of two coaxial cups field applied parallel to their axis. This analysis was performed investigate the potential shielding systems with reduced length/radius aspect ratio exploiting opposite properties superconducting and ferromagnetic materials. measured attenuation for fields up 1.5 T, different positions along cup At higher fields, solution gives factors more than three four times those MgB2 alone at T = 20 30 K,...

Abstract YBa 2 Cu 3 O 7 -based coated conductors (CCs) achieve the highest critical current densities ( J c ) of any known superconductor and are a key technology for applications such as rotatory machines, high-field magnets power transmission. Incorporation nano-sized non-superconducting second phases additional vortex pinning centers has been considered most amenable route to further enhance at an industrial scale, successfully used in commercial CCs. The resulting landscape is quite...

We report on specific nonlinear features in the response of microwave coplanar resonators obtained from magnesium diboride thin films. Different jumpwise behaviors observed resonance curves are found to be generated by either weak-link switching or vortex avalanches. Both mechanisms can explained terms local-heating-induced thermal bistability, but they result opposite effects, i.e., signs abrupt variations quality factor and frequency, due rf-current distribution. The weak-link-switching...

We investigated the efficiency in magnetic field mitigation of superimposed MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Fe coaxial cups with cylindrical symmetry, subjected to an applied parallel their axis. The cup was grown by a microwave-assisted Mg-liquid infiltration technique boron preform. This allows obtaining samples reduced amount unreacted magnesium, shape chosen before growth procedure, and easily scalable sizes....

In this paper we investigate and compare the shielding properties of superconducting hybrid superconducting/ferromagnetic systems, consisting cylindrical cups with an aspect ratio height/radius close to unity. First, reproduced, by finite-element calculations, induction magnetic field values measured along symmetry axis in a (MgB2) configuration (MgB2/Fe) as function applied position. The calculations are carried out using vector potential formalism, taking into account simultaneously...