Magnetostriction Related Effects in Pulsed Laser Irradiation of Amorphous Magnets

1997 ◽  
Vol 504 ◽  
Author(s):  
Monica Sorescu ◽  
S. A. Schafer
Keyword(s):  
Electron Microscopy ◽  
Metallic Glasses ◽  
Pulsed Laser ◽  
Alexandrite Laser ◽  
Complementary Information ◽  
Laser Fluences ◽  
Magnetostriction Constant ◽  
Amorphous Magnets ◽  
Scanning Electron ◽  
Pulsed Laser Irradiation

ABSTRACTSamples of Fe66Co18B15Si1, Fe40Ni38Mo4B18 and Fe72.6Cr22Al4.8Si0.3Y0.3 metallic glasses were irradiated with a pulsed alexandrite laser (λ=750 nm, τ=60 μs) using different laser fluences. Irradiation-induced structural and property modifications were characterized using Mössbauer spectroscopy. Complementary information was obtained from hysteresis loop measurements and scanning electron microscopy (SEM). The experimental data obtained demonstrate the key role played by the magnetostriction constant in explaining the mechanism of irradiation-induced phase transformations in amorphous magnets.

Photoemission Study of Low-Fluence, Non-Thermal Laser Damage of UHV-Cleaved Gallium Arsenide (110)

1990 ◽  
Vol 201 ◽  
Author(s):  
S. S. Goldenberg ◽  
J. P. Long ◽  
M. N. Kabler
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gallium Arsenide ◽  
Temperature Rise ◽  
Photoelectron Spectroscopy ◽  
Pulsed Laser ◽  
Laser Damage ◽  
Laser Fluences ◽  
Photoemission Study ◽  
Scanning Electron

AbstractThe pulsed-laser induced photochemical production of metallic Ga islands on the surface of GaAs cleaved, irradiated, and studied in ultrahigh vacuum (UHV) is documented through photoelectron spectroscopy and subsequent scanning electron microscopy. Ga islands are detected for laser fluences as low as 1 mJ/cm2, far below those previously reported for modification of GaAs, and for which the temperature rise is negligible.

Surface modifications of fullerite induced by pulsed laser irradiation

1995 ◽  
Vol 397 ◽  
Author(s):  
P. Milani ◽  
M. Manfredini
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pulsed Laser ◽  
Surface Modifications ◽  
Periodic Patterns ◽  
Pulsed Nd:Yag Laser ◽  
Transmission Electron ◽  
Scanning Electron ◽  
Pulsed Laser Irradiation

ABSTRACTThe formation of periodic patterns on fullerite thin film surfaces is observed after irradiation with a pulsed Nd:Yag laser (1064 nm). C60 disruption and subsequent coalescence of the fragments take place, resulting in the formation of carbon nanotubes and polyhedral hollow graphitic particles. The effects of irradiation have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman scattering.

scholarly journals Antibacterial activity of zinc oxide nanoparticles obtained by pulsed laser ablation in water and air

2018 ◽  
Vol 243 ◽  
pp. 00017 ◽  
Author(s):  
Daria Goncharova ◽  
Ekaterina Gavrilenko ◽  
Anna Nemoykina ◽  
Valery Svetlichnyi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antibacterial Activity ◽  
Laser Ablation ◽  
Zno Nanoparticles ◽  
Antibacterial Properties ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Composition And Structure ◽  
Scanning Electron

The paper studies physicochemical and antibacterial properties of ZnO nanoparticles obtained by pulsed laser ablation in water and air. Their composition and structure were studied by X-ray diffraction, transmission and scanning electron microscopy. Antibacterial activity of the nanoparticles was examined by its affection on Gram-positive Staphylococcus aureus (S.aureus). The dependence of nanoparticles’ physical and chemical antibacterial properties on the conditions of the ablation was shown. The model materials for the antibacterial bandage were made of cotton, filter paper and biodegradable polymer scaffolds (poly-l-lactide acid), and then they were coated with the obtained ZnO nanoparticles. The model bandage materials were examined by the scanning electron microscopy method and their antibacterial activity (ISO 20743:2013) was determined. High activity of all the samples against S.aureus was proved.

Photothermal structural modification of porous gold nanoshells via pulsed-laser irradiation: effects of laser wavelengths and surface conditions

2020 ◽  
Vol 22 (40) ◽  
pp. 23333-23341
Author(s):  
Tae-Hyeon Park ◽  
Dong-Won Jeong ◽  
Du-Jeon Jang
Keyword(s):  
Structural Modification ◽  
Pulsed Laser ◽  
Picosecond Pulse ◽  
Gold Nanoshells ◽  
Irradiation Effects ◽  
Surface Conditions ◽  
Porous Gold ◽  
Laser Fluences ◽  
Nanoparticle Surface ◽  
Pulsed Laser Irradiation

We demonstrate the detailed effects of laser wavelengths and nanoparticle surface conditions, as well as laser fluences, in the structural modification of porous gold nanoshells induced by picosecond pulse irradiation.

Substrate Latent Heat Effects in The Calculations for Pulsed Laser Irradiated Thin Films

1983 ◽  
Vol 13 ◽  
Author(s):  
J.J. Cao ◽  
K. Rose ◽  
O. Aina ◽  
W. Katz ◽  
J. Norton
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Pulsed Laser ◽  
Phase Changes ◽  
Morphological Observation ◽  
Substrate Structure ◽  
Heat Effects ◽  
Film Substrate ◽  
Scanning Electron ◽  
Pulsed Laser Irradiation

ABSTRACTWe present a numerical model for the calculation of the temperature rise caused by pulsed laser irradiation of a thin film/substrate structure. This model includes phase changes in both the thin film and the substrate. The inclusion of phase changes results in more complex thermal behavior and significantly affects melt durations. This model was applied to the AuGe/GaAs system. Morphological observation using the scanning electron microscope and SIMS profiles provides experimental verification for the numerical calculations.

Utilization of ß-Diketones for Etching and Cleaning of Metal Oxide and Sulfide Thin Films

1993 ◽  
Vol 300 ◽  
Author(s):  
Steven R. Droes ◽  
A. Jain ◽  
T.T. Kodas ◽  
M.J. Hampden-Smith ◽  
R. Muenchausen
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Metal Oxides ◽  
Rutherford Backscattering Spectrometry ◽  
Pulsed Laser ◽  
Analytical Techniques ◽  
Laser Deposition ◽  
Wafer Cleaning ◽  
Scanning Electron ◽  
Mechanism Of The Reaction

ABSTRACTWe are examining dry processes for wafer cleaning and producing patterned thin films of metal oxides. This research focuses on determining the kinetics and mechanism of the reaction between ß-diketones and selected metal oxides. Preliminary experiments indicated that CuO, MgO, PbO and ZnO all react readily with 1,1,1,5,5,5-hexafluoroacetylacetone (hfacH). Thin films of CuO and MgO were fabricated via pulsed laser deposition, characterized by various analytical techniques such as Rutherford Backscattering Spectrometry and Scanning Electron Microscopy, etched using hfacH, and then further characterized. Etching rates for CuO and MgO were measured in order to develop a mechanistic understanding of the reaction.

Melting Phenomena and Impurity Redistribution During Pulsed Laser Irradiation of Amorphous Silicon Layers

1983 ◽  
Vol 23 ◽  
Author(s):  
J. Narayan ◽  
C. W. White ◽  
O. W. Holland
Keyword(s):  
Electron Microscopy ◽  
Amorphous Silicon ◽  
Cross Section ◽  
Pulsed Laser ◽  
Nucleation And Growth ◽  
Bulk Nucleation ◽  
Section Electron ◽  
Section Electron Microscopy ◽  
Pulsed Laser Irradiation ◽  
Impurity Redistribution

ABSTRACTwe have investigated microstructural changes and phase transformations in 30Si+, 75As+, 63Cu+, and 115In+ implanted amorphous silicon layers as a function of pulse energy density. Cross-section electron microscopy studies have revealed the formation of two distinct regions, large and fine polycrystalline regions below the threshold for “defect-free” annealing. The fine polycrystalline region is formed primarily by explosive recrystallization, and occasionally by bulk nucleation and growth. The impurity redistribution in the large and fine polycrystalline regions were determined by Rutherford backscatterinq measurements. Large redistributions of impurities in the large poly region are consistent with velocity of solidifications of 3–5 ms−1. The nature of impurity redistributions in the fine poly region as a function of distribution coefficient provides information on the details of liquid phase crystallization phenomena.

scholarly journals Studi Metode Pendinginan Super Cepat untuk Pembentukan Bulk Metallic Glasses pada Paduan Cu45Zr45Al5Ag5

2019 ◽  
Vol 3 (2) ◽  
pp. 10-17
Author(s):  
Andromeda Dwi Laksono ◽  
Rifqi Aulia Tanjung
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Metallic Glasses ◽  
Electron Probe ◽  
Bulk Metallic Glasses ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Energy Dispersion Spectrometer ◽  
Scanning Electron

Bulk Metallic Glass (BMG) memiliki sifat mekanik, magnetik, kimia dan fisik yang berbeda dengan paduan polikristalin karena susunan internal atomnya yang tidak teratur. Sehingga, BMG memiliki kekuatan mekanik yang baik, kekerasan yang tinggi, ketahanan terhadap aus dan korosi yang tinggi, dan kehalusan permukaan yang baik. Berdasarkan sifat tersebut, BMG memiliki kelayakan yang menjanjikan di bidang industry. Dalam penelitian ini, metode pengecoran cetakan di tembaga digunakan untuk menyiapkan BMG paduan Cu45Zr45Al5Ag5. Paduan dileburkan ulang dengan pendinginan super cepat menggunakan mesin pendingin di bawah temperatur -25 oC. Dengan metode pengecoran cetakan di tembaga, sampel ukuran besar berbentuk batang dipotong dengan diameter 2 mm hingga 4 mm dan panjang 30 mm. Batang kemudian dipotong lagi menjadi spesimen berbentuk cakram. Untuk memastikan apakah sampel adalah BMG atau tidak, sampel dievaluasi dengan Scanning Electron Microscopy (SEM), Energy Dispersion Spectrometer (EDS), Differential Scanning Calorimetry (DSC), Electron Probe X-ray Micro Analyzer (EPMA), dan X -ray Difraction (XRD). Hasilnya dibahas dalam penelitian ini. Kata Kunci: Bulk Metallic Glasses, Cu45Zr45Al5Ag5, Pengecoran Cetakan di Tembaga.

Superhydrophobic inkjet printed flexible graphene circuits via direct-pulsed laser writing

Nanoscale ◽  
2017 ◽  
Vol 9 (48) ◽  
pp. 19058-19065 ◽  
Author(s):  
Suprem R. Das ◽  
Srilok Srinivasan ◽  
Loreen R. Stromberg ◽  
Qing He ◽  
Nathaniel Garland ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Molecular Dynamic Simulation ◽  
Molecular Dynamic ◽  
Dynamic Simulation ◽  
Pulsed Laser ◽  
Scanning Electron Microscopy Micrographs ◽  
Simulation Results ◽  
Scanning Electron

(Left) Scanning electron microscopy micrographs and corresponding contact angle (CA) images for (top) thermally annealed inkjet printed graphene (IPG) and (bottom) laser annealed (IPG). (Right) Molecular dynamic simulation results correlating CA and changes in graphene petal orientation due to laser treated IPG.

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