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Добірка наукової літератури з теми "MgO film- Irradiation"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "MgO film- Irradiation"

Mizushima, Yasuyuki, та Izumi Hirabayashi. "Preparation of YBa2Cu3O7−δ thin film by laser-assisted metal-organic chemical vapor deposition using highly volatile fluorocarbon-based Ba source". Journal of Materials Research 11, № 11 (листопад 1996): 2698–702. http://dx.doi.org/10.1557/jmr.1996.0341.

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Superconducting oxide films of YBa2Cu3O7−δ (YBCO) were produced on magnesia (MgO) single crystalline substrates (100) by laser-assisted metal-organic chemical vapor deposition. The highly volatile Ba(hfa)2 · tetraglyme was used as a Ba source metal-organic material. Smoother surface YBCO film was obtained with KrF laser irradiation than without. However, KrF laser irradiation does not lower the temperature for formation of YBCO(123) phase. YBCO film prepared at 750 °C on the MgO substrate showed a Tc(R = 0) of 69 K, and that prepared with KrF laser irradiation was 85 K. When water was added to the reaction chamber, barium fluoride was reduced and the YBCO formation was detected at a temperature of 650 °C and higher. YBCO film prepared at the temperature of 700 °C for 40 min without KrF laser irradiation behaves as a semiconductor, and one prepared with laser irradiation showed a Tc(R = 0) of 78 K.

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Tlili, Maher, Chayma Nefzi, Badriyah Alhalaili, Chaker Bouzidi, Lassaad Ajili, Neila Jebbari, Ruxandra Vidu, and Najoua Turki Kamoun. "Synthesis and Characterization of MgO Thin Films Obtained by Spray Technique for Optoelectronic Applications." Nanomaterials 11, no. 11 (November 15, 2021): 3076. http://dx.doi.org/10.3390/nano11113076.

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Magnesium oxide (MgO) thin films with different magnesium concentrations ([Mg2+] = 0.05, 0.1, 0.15 and 0.2 mol·L−1) in a spray solution have been successfully grown using a spray pyrolysis technique. X-ray diffraction (XRD), Maud software, FTIR spectroscopy, a confocal microscope, Wien2k software, spectrophotometry and a Photoluminescence spectrometer were used to investigate the structural, morphological and optical properties. XRD analysis revealed a better crystalline quality of the MgO thin layer synthesized with [Mg2+] = 0.15 mol·L−1, which crystallized into a face-centered cubic structure along the preferred orientation (200) lattice plan. The enhancement of the crystalline quality for the MgO thin film ([Mg2+] = 0.15 mol·L−1) was obtained, which was accompanied by an increment of 94.3 nm of the crystallite size. No secondary phase was detected and the purity phase of the MgO thin film was confirmed using Maud software. From the transmission spectra results, high transparent and antireflective properties of the MgO thin film were observed, with an average transmission value of about 91.48% in the visible range, which can be used as an optical window or buffer layer in solar cell applications. The films also have a high reflectance value in the IR range, which indicates that the highly reflective surface will prevent an increase in surface temperature under solar irradiation, which could be beneficial in solar cell applications. A direct band gap type was estimated using the Tauc relation which is close to the experimental value of 4.0 eV for optimal growth. The MgO material was tested for the degradation of methylene blue (MB), which reached a high photodegradation rate of about 83% after 180 min under sunlight illumination. These experimental trends open a new door for promising the removal of water contaminants for photocatalysis application.

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Ushida, Takahisa, Hiroyuki Higa, Kazutoshi Higashiyama та Izumi Hirabayashi. "Preparation and growth mechanism ofa-axis-oriented YBa2Cu3O7-δ films by laser metal-organic chemical vapor deposition". Journal of Materials Research 9, № 5 (травень 1994): 1067–81. http://dx.doi.org/10.1557/jmr.1994.1067.

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Recently we have found a very effective method for controlling the orientation of YBCO films by metal-organic chemical vapor deposition (MOCVD) using uv laser irradiation during deposition onto a MgO(100) substrate. The irradiated part was stronglya-axis-oriented normal to the surface of the substrate for films prepared at 650-700 °C, whereas the unirradiated parts showedc-axis or (110) orientation. This phenomenon occurs not only on MgO(100) substrates but also on other substrates. We obtained aTcabove 81 K on thea-axis oriented part. The critical current density was over 105A/cm2at 4.2 K and O T. The surface morphology depends on the laser power density and the repetition rate. A high degree of thea-axis orientation is obtained only by using uv light during deposition of YBCO film. IR or a visible laser causes only surface melting and the destruction of film orientation. We propose that the nuclei fora-axis orientation are formed by the aggregation of Ba caused by uv laser irradiation near the film surface.

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Tsujita, T., T. Nagatomi, and Y. Takai. "Abnormal electron emission from MgO thin film under ion irradiation." Surface and Interface Analysis 37, no. 2 (2005): 137–40. http://dx.doi.org/10.1002/sia.1949.

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Kim-Ngan, N. T. H., A. G. Balogh, J. D. Meyer, J. Brötz, S. Hummelt, M. Zając, T. Ślęzak, and J. Korecki. "Thermal and irradiation induced interdiffusion in Fe3O4/MgO(001) thin film." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 267, no. 8-9 (May 2009): 1484–88. http://dx.doi.org/10.1016/j.nimb.2009.01.073.

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Bennett, Steven P., Samuel W. LaGasse, Marc Currie, Olaf Van’t Erve, Joseph C. Prestigiacomo, Cory D. Cress, and Syed B. Qadri. "N+ Irradiation and Substrate-Induced Variability in the Metamagnetic Phase Transition of FeRh Films." Coatings 11, no. 6 (May 31, 2021): 661. http://dx.doi.org/10.3390/coatings11060661.

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Metamagnetic FeRh has been the focus of numerous studies for its highly unique antiferromagnetic (AF) to ferromagnetic (FM) metamagnetic transition. While this phase transition usually occurs above room temperature (often Tc > 400 K), both ion irradiation and strained epitaxial growth have been used to bring it to applicable temperatures. Nevertheless, cross sample variability is pervasive in these studies. Here we explore the optical and magnetic properties of 35 nm thick FeRh grown by magnetron sputter deposition simultaneously on two different single crystal substrates: epitaxially on MgO (001) and highly strained with large lattice mismatch on Al2O3 (1000). We then irradiate the epitaxial film with 5 keV N+ ions to introduce disorder (and to a lesser extent, modify chemical composition) without effecting the surface morphology. We find that the phase-transitional properties of both films are strikingly different due to the large lattice mismatch, despite being grown in tandem with nominally identical growth conditions including Fe/Rh stoichiometry, pressure, and temperature. We observe that N+ implantation lowers Tc by ~60 K, yielding a sample with nominally the same transition temperature as the non-epitaxial film on sapphire, yet with a significantly increased magnetic moment, a larger magnetization change and a more abrupt transition profile. We attribute these differences to the Volmer-Weber type growth mode induced by the sapphire substrate and the resulting rougher surface morphology.

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Jannah, A. N., S. A. Halim, and H. Abdullah. "Surface Morphology Studies on Laser Irradiated Target and Bi(Pb)SrCaCuO Thin Films." Materials Science Forum 995 (June 2020): 89–93. http://dx.doi.org/10.4028/www.scientific.net/msf.995.89.

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In this study, pulsed laser deposition technique was used to deposit bismuth plumbum strontium calcium copper oxide {Bi (Pb)SrCaCu0} thin films on MgO single crystal substrate. Solid state procedure which is inexpensive technique used in the production process of the Bi (Pb)SrCaCu0 superconductor bulk sample. In this work, Handy YAG Lasers (model: HYL 101 E) has been used. It is a high power class 4 solid state (ND: YAG) Q-switched pulsed laser and 532 nm (visible green: second harmonic) has been used to ablate the films. The substrate used in this work was single crystal MgO with the (100) orientation. Scanning Electron Microscopy (SEM) was used to observe the microstructure of fracture surface and cross section of thin film materials. Variable Pressure Scanning Electron Microscope (LEO-VPSEM) was used to study the correlation between the microstructure features. SEM studies have shown that the surface morphology of the bulk sample comprises platelets of average size ≈10μm with uniform and homogenous microstructure. The typical morphology of the as deposited films showed a continuous phase, granular structure, which spherical particles up to 5μm in diameter. The most prominent types of particulates BPSCCO films on MgO substrate are droplets with smooth surface, bigger droplets with granular surface, spherically-shaped features confined by randomly oriented facets, submicron rod-like features, Cu-enriched needles, platelets, irregularly-shaped Cu-rich outgrowths, strongly Cu-enriched tabular outgrowths, big target fragments, island growth structure, cubic and rectangular cubic structures. SEM analysis also showed that the deposition time have a pronounced influence on the particle size. The target morphology, which develops under laser-irradiation, depends on the laser fluence and the technique, by which the laser beam is moved relatively to the target during ablation. Laser-irradiated surfaces normally become altered both physically and chemically and morphological changes take the form of periodic structures such as ripples and ridges.

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Nagatomi, T., T. Kuwayama, Y. Takai, K. Yoshino, Y. Morita, M. Kitagawa, and M. Nishitani. "Application of ion scattering spectroscopy to measurement of surface potential of MgO thin film under ion irradiation." Applied Physics Letters 92, no. 8 (February 25, 2008): 084104. http://dx.doi.org/10.1063/1.2888957.

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Du, J. L., Y. H. Qiu, J. Zhang, J. C. Huang, Z. M. Wu, X. F. Zhang, Y. H. Wang, et al. "The alleviation of radiation-damage on Nb/MgO film driven by strain gradient in He ion irradiation." Applied Surface Science 465 (January 2019): 1014–18. http://dx.doi.org/10.1016/j.apsusc.2018.09.174.

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Yu, Hak Ki, Woong-Kwon Kim, Eung Chul Park, Jae Sung Kim, Bon-Woong Koo, Young-Woon Kim, Jae Hwa Ryu, and Jong-Lam Lee. "Enhanced Secondary Electron Emission in Nanoscale Thin Metal Containing MgO Film: Laser Irradiation on Creation of F Centers." Journal of Physical Chemistry C 115, no. 36 (August 22, 2011): 17910–14. http://dx.doi.org/10.1021/jp205759s.

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Дисертації з теми "MgO film- Irradiation"

SARMA, BHASKARJYOTI. "Effect of Disorder on Domain Wall Dynamics." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2713359.

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The purpose of this work is to study the effects of disorders on domain wall dynamics in perpendicular magnetic anisotropy ultra-thin ferromagnetic materials. It is done, firstly, by experimental study of domain wall dynamics in Ta/CoFeB/MgO material where distributions and strengths of pinning points are controlled by light ion irradiation and secondly, by micromagnetic study of the dynamics and morphology of a bubble domain in a disorder induced PMA material with Dzyaloshinskii-Moriya interaction. By studying the effects of He^{+} ion irradiation on domain wall dynamics, it is found that irradiation inﬂuences the distribution of pinning points as well as their strengths, thereby inﬂuencing the velocities of domain walls. The velocities are found to be lowest for non-irradiated samples, then it is observed to increase with irradiation and then decrease at higher irradiations suggesting that there is an optimum irradiation where velocity should be maximum. On the other hand, by studying the dynamics of bubble domain using micromagnetic simulations in ultra-thin films with disorder and Dzyaloshinskii-Moriya interaction, it is found, as expected that magnetic bubbles expand asymmetrically along the axis of the in-plane field under the simultaneous application of out-of-plane and in-plane fields. Remarkably, the shape of the bubble was found to have a ripple-like part which caused a kink-like (steep decrease) feature in the velocity versus in-plane field curve. It is shown that these ripples originate due to the nucleation and interaction of vertical Bloch lines. Furthermore, it is also shown that the Dzyaloshinskii-Moriya interaction field is not constant, in contradiction with the results of experiments, but rather depends on the in-plane field.

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Тези доповідей конференцій з теми "MgO film- Irradiation"

Krupska, Magdalena, N. T. H. Kim-Ngan, Aneta Duda, and A. G. Balogh. "Stability of magnetite layer on Fe3O4/MgO(001) and Fe3O4/Fe/MgO(001) films under 1MeV Kr+ ion irradiation." In 2017 IEEE 7th International Conference "Nanomaterials: Application & Properties" (NAP). IEEE, 2017. http://dx.doi.org/10.1109/nap.2017.8190165.

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