Fabrication and tuning soft magnetic and magneto-optical properties of BMGs based Fe-B-Nb-Ni transparent thin films, obtained by Pulsed Laser Deposition.

2014 ◽  
Vol 1649 ◽  
Author(s):  
Ansar Masood ◽  
A. A. Afridi ◽  
V. Ström ◽  
A. Riazanova ◽  
L. Belova ◽  
...  
Keyword(s):  
Film Thickness ◽  
Faraday Rotation ◽  
Laser Deposition ◽  
Visible Range ◽  
Magnetic Characteristics ◽  
Silicon Substrates ◽  
Soft Magnetic ◽  
Wide Range ◽  
Quartz Substrates ◽  
Magneto Optic

ABSTRACTWe have fabricated by pulse laser deposition very thin (∼5-7 nm) and thick (∼27-408 nm) films of composition Fe66B24Nb4Ni6 on silicon and quartz substrates respectively, and studied their magnetic and magneto-optic properties at room temperature. We find that the thicker films on silicon can be tuned by appropriate thermal annealing to exploit soft magnetic characteristics with low HC, and high MS values. The magnetic hysteretic loops of the as-deposited thicker films on silicon substrates show two interesting characteristics: 1) increase in the coercivity with the film thickness and 2) the onset of a two stage process during the approach to magnetic saturation. The initial in-plane characteristic of the hysteresis loop is followed by a linear anisotropic behavior between remanence and saturation- that changes into square soft-magnetic loops on decreasing the film thickness. By suitable annealing the intrinsic strain disappears at relatively low temperatures (≤200 oC); the thicker films can be tailored to exhibit a simple soft-magnetic square loop with low HC. The ∼5-7 nm films deposited on glass are transparent and have been investigated for their magneto-optic properties using Faraday rotation (FR) measurement technique. Very high values of FR in the range 4-20 deg/µm almost linearly dependent on the wavelength of light in the range 405-611 nm are observed. The observed high values of Faraday rotation over a wide range of wavelength of light are useful for the applications as magneto-optic sensors in the UV to visible range.

Pulsed laser deposition of oriented V2O5 thin films

2000 ◽  
Vol 15 (10) ◽  
pp. 2249-2265 ◽  
Author(s):  
Jeanne M. McGraw ◽  
John D. Perkins ◽  
Falah Hasoon ◽  
Philip A. Parilla ◽  
Chollada Warmsingh ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Oxygen Pressure ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Glass Substrates ◽  
Wide Range ◽  
Phase Pure ◽  
Amorphous Quartz ◽  
Quartz Substrates

We have found that by varying only the substrate temperature and oxygen pressure five different crystallographic orientations of V2O5 thin films can be grown, ranging from amorphous to highly textured crystalline. Dense, phase-pure V2O5 thin films were grown on SnO2/glass substrates and amorphous quartz substrates by pulsed laser deposition over a wide range of temperatures and oxygen pressures. The films' microstructure, crystallinity, and texturing were characterized by electron microscopy, x-ray diffraction, and Raman spectroscopy. Temperature and oxygen pressure appeared to play more significant roles in the resulting crystallographic texture than did the choice of substrate. A growth map summarizes the results and delineates the temperature and O2 pressure window for growing dense, uniform, phase-pure V2O5 films.

Tungsten Oxide (WO3) Films Prepared by Sol-Gel Spin-Coating Technique

2018 ◽  
Vol 280 ◽  
pp. 71-75 ◽  
Author(s):  
B. Wen Cheun Au ◽  
Kah Yoong Chan ◽  
Wai Leong Pang ◽  
Chu Liang Lee ◽  
Abd Hamid Mustafa
Keyword(s):  
Film Thickness ◽  
Tungsten Oxide ◽  
Indium Tin Oxide ◽  
Spin Coating ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Visible Range ◽  
Smart Windows ◽  
Wide Range ◽  
Coating Method

Tungsten oxide (WO3) is a transition metal oxide with a wide range of applications such as displays, rear-view mirrors, electrochromic (EC) smart windows and gas sensors. Many techniques were adopted for the fabrication of WO3, namely magnetron sputtering, spray pyrolysis and sol-gel synthesis techniques. In this work, WO3films were deposited on indium tin oxide (ITO) coated glasses by sol-gel spin-coating method. The film thickness was varied by depositing different number of layers. The WO3film thickness and optical transmittance were determined using step profilometer and ultraviolet-visible (UV-Vis) spectrophotometer, respectively. WO3film thicknesses increased from 38 nm to 606 nmwith increasing number of deposited layers.The optical transmittance of the WO3films in visible range decreased with increasing film thickness. The optical transmittance were at least 70 % up to 10 deposited layers.WO3is a promising EC material in the application ofEC devices (ECDs).The application of WO3in the EC devices will be discussed.

In-Situ Optical Diagnostics During Pulsed-Laser Deposition of Magnetoresistive La-Ca-Mn-O Films on Silicon Substrates

1996 ◽  
Vol 441 ◽  
Author(s):  
P.-J. Kung ◽  
J. E. Cosgrove ◽  
K. Kinsella ◽  
D. G. Hamblen
Keyword(s):  
Film Thickness ◽  
Substrate Temperature ◽  
Pulsed Laser Deposition ◽  
Film Growth ◽  
Pulsed Laser ◽  
Target Surface ◽  
Laser Deposition ◽  
Silicon Substrates ◽  
Ft Ir

AbstractDuring pulsed-laser deposition of La0.67Ca0.33MnO3 films on silicon substrates, a system that consists of visible optical-emission spectroscopy (OES) and Fourier transform infrared (FT-IR) spectroscopy is employed to perform in-situ diagnosis of the laser-induced plume and to monitor the substrate temperature and the film thickness. The effects of oxygen pressure, laser fluence, and distance from the target surface on emission spectra were studied. In FT-IR measurements, the slopes of the reflectance versus wavenumber curves were observed to increase with film thickness and hence with time, which provides end-point detection during the film growth. La0.67Ca0.33MnO3 films with (100), (110), and mixed orientations, depending on the substrate temperature, were deposited on yttria-stabilized zirconia (YSZ) buffered Si(100) and Si(111) substrates. In a magnetic field of 5 T, the maximum magnetoresistance (MR) values of 250% at 195 K and 164% at 140 K were observed in the as-deposited (110) and (100) films, respectively.

Effect of ZnO Film Thickness on its Optical and Structural Properties

2018 ◽  
Vol 52 ◽  
pp. 102-114 ◽  
Author(s):  
Rene Pérez-Cuapio ◽  
Mauricio Pacio ◽  
Hector Juarez ◽  
Jose Alberto Alvarado ◽  
Cesia Guarneros ◽  
...  
Keyword(s):  
Film Thickness ◽  
Structural Properties ◽  
Spin Coating ◽  
Morphological Evolution ◽  
Sol Gel ◽  
Visible Range ◽  
Zno Films ◽  
Silicon Substrates ◽  
Zno Film ◽  
Uv Emission

In this study, we report the effect of ZnO film thickness on its optical and structural properties. The sol solution was synthesized by sol-gel method and deposited on silicon substrates by spin coating technique. The ZnO films thickness was varied from 60 to 180 nm. The ZnO films obtained showed a highly preferred orientation along the (002) plane. It was also observed that the crystallite size was not affected by increasing thickness. Transmittance measurements indicated that the ZnO films have a high transparency in the visible range (~90 %), which remained constant with thickness. Morphological evolution measurements confirmed that the thinner ZnO film consist mostly of a porous layer which became homogeneous and compact to increase the thickness. Photoluminescence measurements exhibit a strong ultraviolet (UV) emission, and the emission intensity was improved with thickness due to crystallinity enhancement.

scholarly journals Innovative Soft Magnetic Composite Materials: Evaluation of magnetic and mechanical properties

2018 ◽  
Vol 8 (1) ◽  
pp. 368-372
Author(s):  
Emir Pošković ◽  
Fausto Franchini ◽  
Marco Actis Grande ◽  
Luca Ferraris ◽  
Róbert Bidulský
Keyword(s):  
Mechanical Properties ◽  
Magnetic Characteristics ◽  
Organic Layer ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Magnetic Circuits ◽  
Research Activities ◽  
Wide Range ◽  
Mechanical Performances

Abstract Electrical machines cover a very wide range of applications in many industrials sectors and the research to improve the performance of those applications is recently leading to the development of new solutions. Those devices are generally equipped with magnetic circuits made of laminated ferromagnetic steel, but in the last decade, new magnetic materials have been developed to realise magnetic circuits: Soft Magnetic Composites (SMC). The Authors have investigated SMCs with organic layer obtained through the adoption of phenolic and epoxy resins; in previous research activities several mixture compositions have been produced and analysed with different percentages of binder and compacting pressures. Promising results regarding magnetic and mechanical performances have been obtained using a very low binder content. The paper aims to investigate the lower limit of the binder to be used, still keeping good mechanical properties. Appropriate magnetic tests have been performed on toroidal specimens: good magnetic characteristics have been obtained, maintaining on the other side proper mechanical strength.

Pulsed Laser Deposition of Magneto-Optic Material

1990 ◽  
Vol 191 ◽  
Author(s):  
K. B. Erington ◽  
W. Mcgahan ◽  
N. J. Ianno ◽  
J. A. Woollam
Keyword(s):  
Electron Microscope ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Multilayer Structures ◽  
X Ray ◽  
Wide Range ◽  
Optic Systems ◽  
Scanning Electron ◽  
Magneto Optic

ABSTRACTA wide range of materials can be deposited by Pulsed Laser Deposition. We will discuss the deposition of materials that can be employed in magneto-optic systems. These materials include dysprosium, cobalt, and aluminum nitride. We will present the results of our work involving the fabrication of multilayer structures of the previously mentioned material. These structures and materials have been characterized by a scanning electron microscope (SEM) and X-ray diffractometry

scholarly journals A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hua-Tian Tu ◽  
An-Qing Jiang ◽  
Jian-Ke Chen ◽  
Wei-Jie Lu ◽  
Kai-Yan Zang ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Wavelength Region ◽  
Ultra Violet ◽  
High Spectral Resolution ◽  
Visible Range ◽  
High Dispersion ◽  
Charge Coupled Device ◽  
Wide Range ◽  
High Resolution Spectrometer

AbstractUnlike the single grating Czerny–Turner configuration spectrometers, a super-high spectral resolution optical spectrometer with zero coma aberration is first experimentally demonstrated by using a compound integrated diffraction grating module consisting of 44 high dispersion sub-gratings and a two-dimensional backside-illuminated charge-coupled device array photodetector. The demonstrated super-high resolution spectrometer gives 0.005 nm (5 pm) spectral resolution in ultra-violet range and 0.01 nm spectral resolution in the visible range, as well as a uniform efficiency of diffraction in a broad 200 nm to 1000 nm wavelength region. Our new zero-off-axis spectrometer configuration has the unique merit that enables it to be used for a wide range of spectral sensing and measurement applications.

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