Interface characterization and atomic intermixing processes in Be/W bilayers deposited on Si(001) substrates with Fe buffer layers

Kuncser, V.; Palade, P.; Schinteie, G.; Sandu, S.G.; Trupina, L.; Lungu, George A.; Gheorghe, Nicoleta; Teodorescu, Cristian M.; Poroşnicu, C.; Jepu, I.; Lungu, C.P.; Filoti, G.

doi:10.1016/j.jallcom.2011.09.063

Cited by 10 publications

(7 citation statements)

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“…Annealing treatments in hydrogen atmosphere performed at moderate temperatures were reported to influence considerably the phase composition and magnetic properties in Fe and Fe oxide based nanostructures. We previously used annealing treatments in hydrogen atmosphere to remove oxidation in various Fe based nanostructures [18][19][20][21] . Snovski 22 used reduction of iron oxide and iron carbide NPs in H 2 at 450 °C for 2.5 h to obtain a main α-Fe phase (91%).…”

mentioning

confidence: 99%

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Greculeasa

Palade

Schinteie

et al. 2020

Sci Rep

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Structural and magnetic properties of Fe oxide nanoparticles prepared by laser pyrolysis and annealed in high pressure hydrogen atmosphere were investigated. The annealing treatments were performed at 200 °C (sample A200C) and 300 °C (sample A300C). The as prepared sample, A, consists of nanoparticles with ~ 4 nm mean particle size and contains C (~ 11 at.%), Fe and O. The Fe/O ratio is between γ-Fe2O3 and Fe3O4 stoichiometric ratios. A change in the oxidation state, crystallinity and particle size is evidenced for the nanoparticles in sample A200C. The Fe oxide nanoparticles are completely reduced in sample A300C to α-Fe single phase. The blocking temperature increases from 106 K in A to 110 K in A200C and above room temperature in A300C, where strong inter-particle interactions are evidenced. Magnetic parameters, of interest for applications, have been considerably varied by the specific hydrogenation treatments, in direct connection to the induced specific changes of particle size, crystallinity and phase composition. For the A and A200C samples, a field cooling dependent unidirectional anisotropy was observed especially at low temperatures, supporting the presence of nanoparticles with core–shell-like structures. Surprisingly high MS values, almost 50% higher than for bulk metallic Fe, were evidenced in sample A300C.

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confidence: 99%

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Greculeasa

Palade

Schinteie

et al. 2020

Sci Rep

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“…If the case of non spherical nanoparticles well dispersed in different matrices, either liquid, crystalline or amorphous is obvious [17,20,31], much difficult is to understand the model validity in case of the analyzed nanogranular films with island like morphology with lateral size of 30-50 nm and 10-15 nm highness [24][25][26], where the intergrain interactions might be not negligible. Tentatively we assume that numerous defect positions at grain boundaries impose a disordered spin structure cutting the exchange interactions among the remaining fine magnetic cores (the long range dipolar interactions might become also negligible due to the relative low net magnetization of the fine cores and their large separation).…”

Section: Resultsmentioning

confidence: 99%

“…In order to respect the model hypothesis, the real magnetic structures should not allow the formation of magnetic domains, fulfilling therefore conditions related to either specific thicknesses (assuring also the in plane anisotropy) or a specific island-like morphology. It is worth to mention that such a tri-dimensional type of growth (Volmer-Weber growth mode) leading to the formation of uniform nanogranular films with small oriented island-like morphologies with lateral size of a few tenths of nanometers and behaving as magnetic single domains were usually reported in case of thin films and multilayers obtained by either sputtering or thermo-ionic arc methods [24][25][26]. Moreover, there is a growing interest in deposition of nanoparticle-assembled thin films by femtosecond pulsed laser deposition in vacuum [27,28] which in certain conditions can be alternative physical supports for the described model.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal via a Stoner–Wohlfarth model with bi-dimensional angular distribution of easy axis

Kuncser

2015

Journal of Magnetism and Magnetic Materials

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“…This metal was combined with iron to create the first GMR structure which demonstrated a GMR effect at low temperature [70].…”

Section: Chromium Deposition By Tvdmentioning

confidence: 99%

“…Tungsten depositions by TVD were intensely deposited and studied both as single materials and as a combination with others [63][64][65][66][67][68][69][70][71][72][73][74] for high temperature plasma facing walls in thermonuclear power plants (JET).…”

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Thermionic Vacuum Discharges for Thin Film Depositions

Mustata,

Lungu,

Jepu

et al. 2023

Coatings

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The thermionic vacuum discharge method is very effective in that the films obtained using this technology are characterised by a very high degree of adhesion, density and purity because the deposition technique is carried out in high, very high or, if possible, in ultra-very high vacuum conditions with no gas present. When the substrate is placed in vacuum, no heat transfer particles are present, the substrate being heated only by the ion incident on the surface. This advantage recommends the TVD method for deposits on plastics or other thermally sensitive materials. Additionally, this slow heat transfer reduces energy loss, making the deposition method industrially competitive. The paper aims to present theoretical aspects of this type of discharge, compared to typical or more popular plasmas but also to present the achievements of this method and its utility in the thin films production, layers that have specific imposed properties. The practical depositions and applications presented are in the nuclear fusion-related material science and also for obtaining materials for granular structures, used as magneto-resistive coatings.

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Interface characterization and atomic intermixing processes in Be/W bilayers deposited on Si(001) substrates with Fe buffer layers

Cited by 10 publications

References 12 publications

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Tuning structural and magnetic properties of Fe oxide nanoparticles by specific hydrogenation treatments

Magnetization reversal via a Stoner–Wohlfarth model with bi-dimensional angular distribution of easy axis

Thermionic Vacuum Discharges for Thin Film Depositions

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