NiFe/INSULATOR/Cu COMPOSITE WIRES AND THEIR GIANT MAGNETO-IMPEDANCE EFFECTS

2010 ◽  
Vol 17 (03) ◽  
pp. 369-373 ◽  
Author(s):  
N. NING ◽  
J. FAN ◽  
J. WU ◽  
H. CHIRIAC ◽  
X. P. LI
Keyword(s):  
Seed Layer ◽  
Copper Wire ◽  
Magnetic Layer ◽  
High Sensitivity ◽  
Composite Wire ◽  
Sensing Element ◽  
Promising Candidate ◽  
Insulator Layer ◽  
Giant Magneto Impedance ◽  
Composite Wires

In this work, two types of electrodeposited Ni–Fe /insulator/ Cu composite wires, namely Ni–Fe /seed layer/glass coated copper wire (Composite Wire A), and Ni–Fe /seed layer/sputtered SiO2/Cu (Composite Wire B), have been fabricated and their giant magneto-impedance effects have been investigated. With different implementations of the insulator layer, the magneto-impedance effect of Composite Wire A, whose insulator layer is cast from the melt Pyrex, is significantly higher than that of Composite Wire B with an insulator of sputtered SiO 2 layer. The profile of the insulator layer, as well as the thickness of magnetic layer and the diameter of the conductive core, greatly influences the interaction between the magnetic layer of Ni–Fe and the copper core, as shown in their giant magneto-impedance (GMI) effects. The maximum MI ratios obtained from Composite Wires A and B are 226% at 800 kHz when H ext = 0.87 Oe , and 95% at 1 MHz when H ext = 0 Oe , respectively. The Composite Wire A is a promising candidate for the sensing element of high sensitivity sensors to very weak magnetic field. For Composite Wire B, further improvement on its GMI effect and sensing performance requires optimization of its geometric parameters and the deposition conditions.

GIANT MAGNETO-IMPEDANCE EFFECTS AND MAGNETIC PERMEABILITY IN CuBe/INSULATOR/CoNiP ELECTROLESS DEPOSITED COMPOSITE WIRES

2011 ◽  
Vol 25 (01) ◽  
pp. 111-117 ◽  
Author(s):  
J. K. CHENG ◽  
Z. J. ZHAO ◽  
H. L. XIN ◽  
Z. M. WU ◽  
X. L. YANG ◽  
...  
Keyword(s):  
Magnetic Permeability ◽  
Electroless Deposition ◽  
Ferromagnetic Layer ◽  
Complex Permeability ◽  
Insulator Layer ◽  
Low Frequencies ◽  
Field Sensitivity ◽  
Giant Magneto Impedance ◽  
Composite Wires ◽  
Maximal Field

Giant magneto-impedance (GMI) effects were investigated in CuBe / CoNiP and CuBe /Insulator/ CoNiP composite wires prepared by electroless deposition on pure or insulated CuBe wires. Experimental results show that the maximal GMI ratio and the field sensitivity of the composite wires are further improved by adding an insulator layer between the CuBe core and ferromagnetic layer. A distinct MI effect was observed in the composite wires with insulator even at low frequencies. MI ratio is about 18% at 20 kHz and 239% at 600 kHz. The maximal field sensitivity is 34%/Oe at 600 kHz. The properties of GMI in these composite wires are analyzed via complex permeability.

scholarly journals An Ultrahigh-Sensitivity Graphene Resonant Gyroscope

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1890
Author(s):  
Yang Lu ◽  
Zhan-She Guo ◽  
Shang-Chun Fan
Keyword(s):  
Angular Velocity ◽  
High Sensitivity ◽  
Velocity Variation ◽  
Beam Length ◽  
Sensing Element ◽  
Finite Element Software ◽  
Resonant Beam ◽  
Frequency Output ◽  
Length Width ◽  
Ultrahigh Sensitivity

In this study, a graphene beam was selected as a sensing element and used to form a graphene resonant gyroscope structure with direct frequency output and ultrahigh sensitivity. The structure of the graphene resonator gyroscope was simulated using the ANSYS finite element software, and the influence of the length, width, and thickness of the graphene resonant beam on the angular velocity sensitivity was studied. The simulation results show that the resonant frequency of the graphene resonant beam decreased with increasing the beam length and thickness, while the width had a negligible effect. The fundamental frequency of the designed graphene resonator gyroscope was more than 20 MHz, and the sensitivity of the angular velocity was able to reach 22,990 Hz/°/h. This work is of great significance for applications in environments that require high sensitivity to extremely weak angular velocity variation.

scholarly journals 60–700 K CTAT and PTAT Temperature Sensors with 4H-SiC Schottky Diodes

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 942
Author(s):  
Razvan Pascu ◽  
Gheorghe Pristavu ◽  
Gheorghe Brezeanu ◽  
Florin Draghici ◽  
Philippe Godignon ◽  
...  
Keyword(s):  
Low Cost ◽  
Schottky Diodes ◽  
Schottky Contact ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Absolute Temperature ◽  
Lower Sensitivity ◽  
Readout Circuit ◽  
Sensing Element ◽  
High Performing

A SiC Schottky dual-diode temperature-sensing element, suitable for both complementary variation of VF with absolute temperature (CTAT) and differential proportional to absolute temperature (PTAT) sensors, is demonstrated over 60–700 K, currently the widest range reported. The structure’s layout places the two identical diodes in close, symmetrical proximity. A stable and high-barrier Schottky contact based on Ni, annealed at 750 °C, is used. XRD analysis evinced the even distribution of Ni2Si over the entire Schottky contact area. Forward measurements in the 60–700 K range indicate nearly identical characteristics for the dual-diodes, with only minor inhomogeneity. Our parallel diode (p-diode) model is used to parameterize experimental curves and evaluate sensing performances over this far-reaching domain. High sensitivity, upwards of 2.32 mV/K, is obtained, with satisfactory linearity (R2 reaching 99.80%) for the CTAT sensor, even down to 60 K. The PTAT differential version boasts increased linearity, up to 99.95%. The lower sensitivity is, in this case, compensated by using a high-performing, low-cost readout circuit, leading to a peak 14.91 mV/K, without influencing linearity.

Enhancement of giant magneto-impedance effect in Ni80Fe20/SiO2/Cu composite wires

2009 ◽  
Vol 404 (20) ◽  
pp. 3766-3770 ◽  
Author(s):  
Lingyan Shi ◽  
Jianzhong Ruan ◽  
Juan Zhang ◽  
Zhenjie Zhao ◽  
H.B. Gao ◽  
...  
Keyword(s):  
Giant Magneto Impedance ◽  
Composite Wires

The Production and Properties of Copper-Iron Particulate Composite Wire

1989 ◽  
Vol 203 (3) ◽  
pp. 175-184
Author(s):  
G I Lawal ◽  
D C Barton ◽  
A N Bramley ◽  
J Nutting
Keyword(s):  
Magnetic Properties ◽  
Structural Changes ◽  
Copper Wire ◽  
Particulate Composite ◽  
Iron Particle ◽  
Composite Wire ◽  
Particulate Form ◽  
Increasing Process ◽  
The Wire ◽  
Magnetic Hardness

A novel means of producing copper-based powder metallurgy wire containing sufficient iron in particulate form to impart useful magnetic properties has been investigated. The method, which involves encapsulating a powder mixture within a copper tube prior to rolling and die-drawing operations, has been successfully used to produce composite wire of diameter range 1.8-0.4 mm. Particular attention has been paid to the effect of composition, processing strain, heat treatment and iron particle size on the electrical, mechanical and magnetic properties of the wire. Microscopy studies have also been carried out to determine structural changes in the material during processing. It was found that the good conductivity and ductility of solid copper wire was not greatly reduced provided (a) the iron content of the composite wire was kept fairly low (<6 per cent) and (b) the annealing temperature was not sufficiently high for significant alloying to take place (650°C maximum). Saturation magnetization values increased with increasing process strain, as did the magnetic hardness. The latter, however, could be minimized by fully annealing the iron after processing the wire. The magnetic properties were undoubtedly influenced by the size and shape of the iron particles, smaller particles being more easily elongated and tending to give greater magnetic hardness.

PERFORMANCE OF pH SENSOR ELECTRODE BASED ON ZnO NRs ON FTO-GLASS SUBSTRATE

2020 ◽  
Vol 27 (08) ◽  
pp. 1950198
Author(s):  
ABDULQADER D. FAISAL ◽  
MOHAMMAD O. DAWOOD ◽  
HASSAN H. HUSSEIN ◽  
KHALEEL I. HASSOON
Keyword(s):  
Seed Layer ◽  
Zno Nanorods ◽  
Ph Sensor ◽  
High Sensitivity ◽  
Hydrothermal Growth ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Nanocrystals ◽  
Electrode Cell ◽  
Fto Glass

In this work, ZnO nanorods (ZnO NRs) were successfully synthesized on FTO-glass via hydrothermal technique. Two steps were followed to grow ZnO NRs. In the first step, the seed layer of ZnO nanocrystals was deposited by using a drop cast method. The second step was represented by the hydrothermal growth of ZnO NRs on a pre-coated FTO- glass with the seed layer. The hydrothermal growth was conducted at 90∘C for 2[Formula: see text]h. The resulted structure, morphology and optical properties of the produced layers were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray (EDX) and UV-visible spectrophotometer, respectively. The analysis confirmed that the ZnO NRs grown by the hydrothermal method have a hexagonal crystal structure which was grown randomly on the FTO surface. The crystallite size was recorded 50[Formula: see text]nm and a slight microstrain (0.142%) was calculated. The bandgap was found to be in the range of 3.14–3.17[Formula: see text]eV. The ZnO NRs have a high density and large aspect ratio. A pH sensor with high sensitivity was fabricated using a two-electrode cell configuration. The ZnO NRs sensor showed the sensitivity of [Formula: see text]59.03[Formula: see text]mV/pH, which is quite promising and close to the theoretical value ([Formula: see text]59.12[Formula: see text]mV/pH).

scholarly journals A Novel Experimental Approach to the Applicability of High-Sensitivity Giant Magneto-Impedance Sensors in Magnetic Field Communication

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 193091-193101
Author(s):  
Jang-Yeol Kim ◽  
In-Kui Cho ◽  
Hyun Joon Lee ◽  
Jaewoo Lee ◽  
Jung-Ick Moon ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Approach ◽  
High Sensitivity ◽  
Giant Magneto Impedance

Magnetic properties and giant magneto-impedance effect in electroless-deposited CoP/Cu composite wires

2019 ◽  
Vol 6 (6) ◽  
pp. 066101 ◽  
Author(s):  
Song Xiang ◽  
Jintang Zou ◽  
Xin Li ◽  
Wenhui Xie ◽  
Z J Zhao
Keyword(s):  
Magnetic Properties ◽  
Giant Magneto Impedance ◽  
Composite Wires

Monolayer Ti2CO2: A Promising Candidate for NH3 Sensor or Capturer with High Sensitivity and Selectivity

2015 ◽  
Vol 7 (24) ◽  
pp. 13707-13713 ◽  
Author(s):  
Xue-fang Yu ◽  
Yan-chun Li ◽  
Jian-bo Cheng ◽  
Zhen-bo Liu ◽  
Qing-zhong Li ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Promising Candidate ◽  
Sensitivity And Selectivity ◽  
Nh3 Sensor

The Dynamic Effects in Electrodeposited NiFe/Cu Wire with Preliminary Torsion

2012 ◽  
Vol 190 ◽  
pp. 243-246
Author(s):  
V. Yagmur ◽  
F.E. Atalay ◽  
N. Bayri ◽  
S. Atalay
Keyword(s):  
Magnetic Field ◽  
Output Voltage ◽  
Magnetic Layer ◽  
Magnetic Film ◽  
Driving Frequency ◽  
Dynamic Effects ◽  
Linear Change ◽  
Electrodeposition Process ◽  
Composite Wires ◽  
Effect Magnitude

Ni80Fe20/Cu composite wires were produced under torsion using electrodeposition method. The total length of the magnetic film deposited onto 50 µm Cu wire is 3 cm and the thickness of the magnetic layer is about 10 µm. All samples showed single peak in magnetoimpedance (MI) curves. The magnitude (ΔZ/Z) % are 260%, 235% and 119% for samples produced under 22.4, 44.8, 89.7 rad/m torsion values, respectively at driving frequency of 160 kHz. MI effect magnitude decreases with increasing applied torsion during the electrodeposition process. A linear change in the second harmonics of output voltage from wire ends as a function of applied magnetic field (coil-less fluxgate effect) was observed in all sample. The sensitivity of coil-less output increases with increasing torsion and maximum sensitivity was observed in the sample produced at 89.7 rad/m torsion.

Sign in / Sign up

Export Citation Format

Share Document