Joseph Vas

Joseph Vas
Centre National de Recherche Scientifique et Technologique | CNRST

Doctor of Philosophy
Domain Propagation in nanomagnets, in-situ/operando studies using TEM

About

34
Publications
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223
Citations

Publications

Publications (34)
Article
In this work, we investigated the effect of Ag doping (2-20 at.%) on the phase formation of iron mononitride (FeN) thin films. Together with deposition of FeN using reactive dc magnetron sputtering, Ag was also co-sputtered at various doping levels between 2-20 at.%. We found that doping of Ag around 5 at.% is optimum to not only improve the therma...
Article
Full-text available
Tungsten (W) is considered as one of the promising candidates for plasma facing components in fusion reactors since it has high threshold energy, high melting point, low threshold shock resistance, and resistance against formation of co-deposits with tritium. Despite these commendable features, helium ions produced during fusion reaction are known...
Article
Directional specific control on the generation and propagation of magnons is essential for designing future magnon-based logic and memory devices for low power computing. The epitaxy of the ferromagnetic thin film is expected to facilitate anisotropic linewidths, which depend on the crystal cut and the orientation of the thin film. Here, we have sh...
Article
The emerging paradigm of oxide-based devices are reshaping the frontiers of sustainable electronics and enabling new functionalities like ferroelectric-photovoltaics, photo-catalytic activity, ferroelectric logics, and terahertz-scale actuation. The intriguing advantages of BiFeO3 (BFO) based oxide electronics offers the possibility of combining el...
Article
Full-text available
Tungsten is one of the prime candidates for a first-wall material near the divertor area due to its high temperature strength, high thermal conductivity, low erosion rate and low tritium retention. The erosion resistance of tungsten to the edge plasmas and transient events are carefully investigated in a simulated fusion environment. Here, we use t...
Article
In this paper, a novel pulsed broad energy spectrum ion-implantation technique, using the dense plasma focus device (DPF), for uniform oxygen-ion doping along the thickness of a ~250 nm thick magnetic CoFeTaZr layer is investigated. A new operational regime of the dense plasma focus – the off-focus mode – is explored to avoid the surface damage of...
Article
Full-text available
The spin Hall effect is a spin–orbit‐coupling‐related phenomenon, in which the charge current generates a transverse spin current and vice versa. Platinum is a well explored spin Hall material due to large spin–orbit coupling and high conductivity, but its interconversion efficiency is of around 10% only. In article number 2000112, Surbhi Gupta, Ya...
Article
Full-text available
High efficiency of charge–spin interconversion in spin Hall materials is a prime necessity to apprehend intriguing functionalities of spin–orbit torque for magnetization switching, auto‐oscillations, and domain wall motion in energy‐efficient and high‐speed spintronic devices. To this end, innovations in fabricating advanced materials that possess...
Article
Full-text available
The atomically flat interface of Y3Fe5O12 (YIG) thin film and Gd3Ga5O12 (GGG) substrate play a vital role in obtaining the magnetization dynamics of YIG below and above the anisotropy field. Here, magneto-impedance (MI) is used to investigate the magnetization dynamics in fully epitaxial 45 nm YIG thin films grown on the GGG (001) substrates using...
Article
Developing flexible multiferroic composite with magnetoelectric coupling is highly desirable for the wearable electronic devices, magnetic field sensors, actuators, energy harvesters and memory devices. Here, a flexible artificial multiferroic composite was fabricated using ferromagnetic nickel ferrite (NiFe2O4) nanoparticles (NPs) as filler in the...
Article
Full-text available
We report the facile synthesis of nanostructured polycrystalline nickel sulphide (NP-Ni 3 S 2 ) on Ni foil at 750 and 800 °C by employing powder vapor transport technique. X-ray diffraction patterns (XRD) confirms the formation of polycrystalline Ni 3 S 2 phase with rhombohedral structure. Raman spectroscopy and x-ray photo-electron spectroscopy (X...
Article
Detection of oxygen plays an important role in food industry, medicine and controlling automotive exhaust. Here, we have developed a Co3O4 nanoparticle-based oxygen gas sensor. Effect of Gadolinium (Gd) doping on oxygen sensing is investigated using the variation in electrical resistance method which clearly reveals improvement in the sensitivity w...
Article
Dense plasma focus (DPF) device is conventionally operated in focus mode, to achieve pinch plasma with highest possible temperature and density to maximize the soft and hard x-rays and charged particles. In this paper, we report the first ever application of non-focus mode of DPF device, which is free of magneto-hydrodynamics (MHD) instabilities, f...
Article
Graphene is typically grown using thermal chemical vapor deposition (CVD) on metallic substrates such as copper and nickel at elevated temperatures above 1000 °C. The synthesis of large-area graphene at low temperature is highly desirable for large volume industrial production. In this paper, the authors report a remote plasma-assisted CVD graphene...
Article
The IEEE Region 10 (R10) Student/Young Professional/ Women in Engineering/Life Member (SYWL) Congress held from 25 - 27 of August 2016 in Bangalore brought together different groups of IEEE members – students, Young Professionals, women and Life Members - under one roof. The meeting was organized by the IEEE Bangalore section and supported by the D...
Article
Conducting polymer composites are attractive alternatives for applications such as electromagnetic shielding in which metals are conventionally used. They have unique advantages like light weight, ease of processing and good strength to weight ratio. This makes them economically viable especially in industries like avionics where weight is an impor...
Article
Conducting polymer composite is an attractive option as electromagnetic shielding material for applications in aviation and defense sectors where weight is an important criterion. Conductivity at low filler loading can be achieved in conventional composites by using fillers of large aspect ratio and small particle size but the conductivity achieved...
Conference Paper
Full-text available
Electromagnetic shielding has become important for various electrical systems because of the electromagnetic pollution caused by the large scale use of electronic devices operating at different frequencies and power levels. Traditionally used metallic shields lack flexibility and hence may not be the right choice for certain applications. In such s...
Conference Paper
The use of polymeric materials such as silicone rubber for shielding applications gives many advantages like ease of processing, high strength to weight ratio and minimal metal content. In the present work, the shielding properties of multi-walled carbon nanotube filled silicone rubber are studied. Shielding measurements are done as per ASTM D 4935...
Article
Corona discharge is recognized as one of the mechanisms that can influence the surface hydrophobicity of Silicone Rubber (SR) because of the chemical changes that occur on its surface. In this study SR samples were exposed to positive and negative DC corona for 25 and 50 hours using a needle-plane electrode system. Hydrophobicity changes were monit...
Article
In order to improve the tracking and erosion performance of outdoor polymeric silicone rubber (SR) insulators used in HV power transmission lines, micron sized inorganic fillers are usually added to the base SR matrix. In addition, insulators used in high voltage dc transmission lines are designed to have increased creepage distance to mitigate the...
Article
ASTM D2303 standard provides a method for evaluating the tracking and erosion resistance of polymeric insulators under ac voltages. In this paper, the above method has been extended for evaluating the performance of the insulators under dc stresses. Tests were conducted on polymeric silicone rubber (SR) insulators under positive and negative dc str...

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