Magnetic and Magneto-Optic Properties of dc Magnetron Sputtered Co-Cr/Al Multilayers

1993 ◽  
Vol 313 ◽  
Author(s):  
G.W. Auner ◽  
R. Naik ◽  
U.M. Rao ◽  
Y. Zhao ◽  
B. Wang
Keyword(s):  
Figure Of Merit ◽  
Single Layer ◽  
Anisotropy Field ◽  
X Ray Diffraction ◽  
Multilayered Structures ◽  
Kerr Rotation ◽  
Axis Orientation ◽  
Glass Substrates ◽  
Multilayered Sample ◽  
Magneto Optic

ABSTRACTSingle layers of Co82?l8 with thickness in me ranee of 100–1500Å and multilayers of Co-Cr/Al with Co-Cr thickness in the range of 100–200A and Al at 7Å were prepared by dc magnetron sputtering. The films were deposited on to Si (111) and glass substrates at room temperature. A 100Å thick Al buffer layer was deposited to improve the c-axis orientation. X-ray diffraction (XRD) Measurements on the multilayers show a predominant Co-Cr (00.2) peak. Polar Magneto-optic measurements were performed to determine the Kerr rotation (θK) and figure of Merit. The results indicated an enhancement in the figure of merit at λ = 632.8 nm for the multilayered structures compared to single layer samples. All of the films show a 4πMs value around 6 kG and ferromagnetic resonance measurements indicate an enhancement in the perpendicular anisotropy field for the 150Å multilayered sample.

CONTROL OF ANISOTROPY FIELD IN HIGH FIGURE OF MERIT MAGNETIC GARNET FILMS FOR MAGNETO OPTIC APPLICATIONS

1985 ◽  
Vol 46 (C6) ◽  
pp. C6-359-C6-363
Author(s):  
B. Ferrand ◽  
M. F. Armand ◽  
H. Moriceau ◽  
J. Daval
Keyword(s):  
Figure Of Merit ◽  
Anisotropy Field ◽  
Garnet Films ◽  
High Figure ◽  
Magnetic Garnet ◽  
Magneto Optic

Magnetic, Magneto-optic and Magnetotransport Properties of Nanocrystalline Co/Au Multilayers with Ultrathin Au Interlayers

2008 ◽  
Vol 8 (9) ◽  
pp. 4323-4328 ◽  
Author(s):  
E. Th. Papaioannou ◽  
V. Karoutsos ◽  
M. Angelakeris ◽  
O. Valassiades ◽  
P. Fumagalli ◽  
...  
Keyword(s):  
Multilayered Structure ◽  
Electron Beam Evaporation ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Stripe Domain ◽  
Kerr Rotation ◽  
Force Microscopy ◽  
Domain Structures ◽  
Face Centered ◽  
Magneto Optic

A series of nanocrystalline Co/Au multilayers with ultrathin Au interlayers was grown at room temperature by electron beam evaporation on Si(111), glass and polyimide substrates. X-ray diffraction measurements reveal a face centered cubic multilayered structure with very small nanograins within 7–10 nm in diameter. Magneto-optic polar Kerr effect experiments show an enhancement of the Kerr rotation around 3 eV as the Au interlayer thickness increases. The experimental data are interpreted with the help of simulated Kerr spectra. The magnetization curves and magnetic force microscopy images indicate the existence of perpendicularly magnetized stripe-domain structures at remanence. The magnitude of the magnetoresistance ratio reaches values of 0.4%. The investigation of the interplay between magnetic and magnetotransport properties demonstrates the contribution of the domain-wall spin-dependent scattering to the magnetoresistance.

High-resolution TEM of Cr-Gd and Co-Gd multilayers

1992 ◽  
Vol 50 (1) ◽  
pp. 200-201
Author(s):  
Gerardo A. Bertero
Keyword(s):  
Heat Of Mixing ◽  
Magnetic Media ◽  
Multilayered Structures ◽  
Kerr Rotation ◽  
High Resolution Tem ◽  
Large Heat ◽  
Optical Applications ◽  
Sputter Deposited ◽  
Magneto Optic

Thin film multilayered structures have assumed significant technological importance. In particular, several have proven adequate for magneto-optic recording applications in which vertical magnetization, large coercivities and a large Kerr rotation effect are needed. In this regard, Co-Gd and Cr-Gd, among others, are candidate systems and specifically Gd-Co has already been used with some success.In the present work, HRTEM was performed on sputter-deposited Cr-Gd and Co-Gd multilayers. These two systems are expected to show contrasting behavior which may affect the long term magneto-optic performance of the multilayer. Cr and Gd are almost totally immiscible, suggesting a large positive heat of mixing. Conversely, Co and Gd form a large number of intermetallic phases and show a deep eutectic at 60 at.% Gd indicating a negative, and possibly large, heat of mixing. Thus, a tendency for intermixing and solid state amorphization is expected for the Co-Gd system and not so for Cr-Gd. These considerations may be of importance since thermal stability is required for magneto-optical applications where the magnetic media is subjected to local thermal cycling during the magnetic writing process.

Influence of Sputtering Power on the Structure and Photoelectric Property of Ga Doped ZnO Films

2012 ◽  
Vol 591-593 ◽  
pp. 922-926
Author(s):  
Lei Wu ◽  
Qing Nan Zhao ◽  
Gang Wu ◽  
Deng Kui Miao
Keyword(s):  
Thin Films ◽  
Visible Light ◽  
Light Transmittance ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Axis Orientation ◽  
Glass Substrates ◽  
Sputtering Power ◽  
Hall Effect Measurements ◽  
Doped Zno

Ga-doped ZnO (GZO) films were prepared on glass substrates at 523K temperature by non-reactive DC magnetron sputtering. The effects of sputtering power on microstructure and properties of the GZO films were investigated by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), Hall effect measurements and UV-Vis-NIR spectrometer. The results show that GZO thin films exhibit high c-axis-orientation, and the intensity of peak increase as the enhanced of sputtering power; the increase of power will reduce the film’s visible-light transmittance, but for all of the GZO thin films the average transmittance of the visible-light is above 80%. The sheet resistance of GZO films decreases when the sputtering power gradually heightened from 80W to 200W. The lowest resistivity of 6.559×10-4Ω•cm can be obtained in the condition of the sputtering power is 100W, and the lowest square resistance is 7.9Ω/□.

scholarly journals Substrate temperature effect on the nanoscale multilayer ZnS/Ag/ZnS for heat mirror application

2015 ◽  
Vol 33 (4) ◽  
pp. 760-766 ◽  
Author(s):  
Ghassem Kavei ◽  
Saeed Nikbin
Keyword(s):  
Substrate Temperature ◽  
Matrix Theory ◽  
High Vacuum ◽  
Single Layer ◽  
Multilayer System ◽  
Electrical Performance ◽  
Characteristic Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates

AbstractNanoscale multilayers of ZnS/Ag/ZnS were deposited on Corning glass substrates at different substrate temperatures. The depositions were carried out in high vacuum using electron beam deposition technique at 20, 60, 100 and 150 °C, respectively. The optical and electrical performance of each single layer and the accomplished ZnS/Ag/ZnS multilayer system were characterized using spectroscopic ellipsometry analysis, XRD and finally AFM. Based on these analyses and associated theories, such as the characteristic matrix theory, the optimized multilayer system was speculated and tested. Crystallographic structures of the films were studied by X-ray diffraction. In addition to X-ray diffraction, morphological characterizations were carried out by AFM in order to observe the deposited particle size, packing and roughness of the films. The optimum performance was achieved at the substrate temperature of 60 °C.

Evolution of Structure with Fe Layer Thickness in low Dimensional Fe/Tb Multilayered Structures

1991 ◽  
Vol 238 ◽  
Author(s):  
V. G. Harris ◽  
K. D. Aylesworth ◽  
W. T. Elam ◽  
N. C. Koon ◽  
R. Coehoorn ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Atomic Structure ◽  
Anisotropy Field ◽  
Amorphous Structure ◽  
Multilayered Structures ◽  
Kerr Rotation ◽  
Sample Plane ◽  
Low Dimensional ◽  
X Ray Absorption ◽  
Kerr Rotation Angle

ABSTRACTThe atomic structure of a series of low-dimensional Fe/Tb multilayered structures has been explored using a conversion-electron, extended x-ray absorption fine structure (EXAFS) technique. A structural transition from a close-packed amorphous structure to a body-centered crystalline structure is detected to occur over an Fe layer thickness range of 12.5 Å to 15.0 Å (Tb thickness is held constant at 4.5 Å). Magnetic properties, specifically, magnetization, anisotropy field, and Kerr rotation angle, are measured and found to change significantly in response to this transition. Exploitation of the polarization properties of synchrotron radiation allowed for the description of the atomic structure both perpendicular and parallel to the sample plane.

Chemical synthesis and study of structural and optoelectronic properties of CdS thin films: Effect of SILAR growth cycles

2015 ◽  
Vol 9 (3) ◽  
pp. 2461-2469
Author(s):  
S. R. Gosavi ◽  
K. B. Chaudhari
Keyword(s):  
Thin Films ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Silar Method ◽  
Growth Cycles ◽  
Glass Substrates ◽  
Layer Adsorption ◽  
Cds Thin Films ◽  
Structural And Optoelectronic Properties ◽  
Deposited Film

CdS thin films were deposited on glass substrates by using successive ionic layer adsorption and reaction (SILAR) method at room temperature. The effect of SILAR growth cycles on structural, morphological, optical and electrical properties of the films has been studied.  The thickness of the deposited film is measured by employing weight difference method. The X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) studies showed that all the films exhibit polycrystalline nature and are covered well with glass substrates. The values of average crystallite size were found to be 53 nm, 58 nm, 63 nm and 71 nm corresponding to the thin films deposited with 30, 40, 50 and 60 SILAR growth cycles respectively. From the UV–VIS spectra of the deposited thin films, it was seen that both the absorption properties and energy bandgap of the films changes with increasing number of SILAR growth cycles. A decrease of electrical resistivity has been observed with increasing SILAR growth cycle. 

Electrodeposition of Cu2O Particles by Using Electrolyte Solution Containing Glucopone as Surfactant

2009 ◽  
Vol 1 (2) ◽  
pp. 18-20
Author(s):  
Dahyunir Dahlan
Keyword(s):  
Indium Tin Oxide ◽  
Pulse Current ◽  
Platinum Electrode ◽  
Saturated Calomel Electrode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Continuous Current ◽  
Oxide Particles ◽  
Cupric Sulphate

Copper oxide particles were electrodeposited onto indium tin oxide (ITO) coated glass substrates. Electrodeposition was carried out in the electrolyte containing cupric sulphate, boric acid and glucopone. Both continuous and pulse currents methods were used in the process with platinum electrode, saturated calomel electrode (SCE) and ITO electrode as the counter, reference and working electrode respectively. The deposited particles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that, using continuous current deposition, the deposited particles were mixture of Cu2O and CuO particles. By adding glucopone in the electrolyte, particles with spherical shapes were produced. Electrodeposition by using pulse current, uniform cubical shaped Cu2O particles were produced

X- ray diffraction and dielectric properties of PbSe thin films

2019 ◽  
Vol 15 (34) ◽  
pp. 1-14
Author(s):  
Bushra A. Hasan
Keyword(s):  
Thin Films ◽  
Thermal Activation ◽  
Thermal Evaporation ◽  
Thermal Activation Energy ◽  
Dielectric Constants ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Glass Substrates

Lead selenide PbSe thin films of different thicknesses (300, 500, and 700 nm) were deposited under vacuum using thermal evaporation method on glass substrates. X-ray diffraction measurements showed that increasing of thickness lead to well crystallize the prepared samples, such that the crystallite size increases while the dislocation density decreases with thickness increasing. A.C conductivity, dielectric constants, and loss tangent are studied as function to thickness, frequency (10kHz-10MHz) and temperatures (293K-493K). The conductivity measurements confirm confirmed that hopping is the mechanism responsible for the conduction process. Increasing of thickness decreases the thermal activation energy estimated from Arhinus equation is found to decrease with thickness increasing. The increase of thickness lead to reduce the polarizability α while the increasing of temperature lead to increase α.

scholarly journals Vibration analysis of a sandwich cylindrical shell in hygrothermal environment

2021 ◽  
Vol 10 (1) ◽  
pp. 414-430
Author(s):  
Chunwei Zhang ◽  
Qiao Jin ◽  
Yansheng Song ◽  
Jingli Wang ◽  
Li Sun ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Natural Frequency ◽  
Equations Of Motion ◽  
Single Layer ◽  
Functionally Graded ◽  
Sandwich Shell ◽  
Continuous Change ◽  
Multilayered Structures ◽  
Cylindrical Sandwich Shell ◽  
Vibrational Behavior

Abstract The sandwich structures are three- or multilayered structures such that their mechanical properties are better than each single layer. In the current research, a three-layered cylindrical shell including a functionally graded porous core and two reinforced nanocomposite face sheets resting on the Pasternak foundation is used as model to provide a comprehensive understanding of vibrational behavior of such structures. The core is made of limestone, while the epoxy is utilized as the top and bottom layers’ matrix phase and also it is reinforced by the graphene nanoplatelets (GNPs). The pattern of the GNPs dispersion and the pores distribution play a crucial role at the continuous change of the layers’ properties. The sinusoidal shear deformation shells theory and the Hamilton’s principle are employed to derive the equations of motion for the mentioned cylindrical sandwich shell. Ultimately, the impacts of the model’s geometry, foundation moduli, mode number, and deviatory radius on the vibrational behavior are investigated and discussed. It is revealed that the natural frequency and rotation angle of the sandwich shell are directly related. Moreover, mid-radius to thickness ratio enhancement results in the natural frequency reduction. The results of this study can be helpful for the future investigations in such a broad context. Furthermore, for the pipe factories current study can be effective at their designing procedure.

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