Giant Magnetoimpedance in Fe73.5Cu1Nb2V1Si13.5B9 Nanocrystalline Ribbons

2014 ◽  
Vol 809-810 ◽  
pp. 99-104 ◽  
Author(s):  
Huai Gu Hu ◽  
Yang Ming Hao ◽  
Chun Jing Gao ◽  
Yan Zhao Wu ◽  
Fei Fei Liang
Keyword(s):  
High Frequency ◽  
High Performance ◽  
Annealing Temperature ◽  
Low Cost ◽  
Low Frequency ◽  
Partial Substitution ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Average Grain Size ◽  
Optimum Annealing Temperature

In the present work, the giant magnetoimpedance effect has been found in Fe73.5Cu1Nb2V1Si13.5B9nanocrystalline ribbons. The optimum annealing temperature for obtaining largest GMI is about 550°C. Fe73.5Cu1Nb2V1Si13.5B9with average grain size of 15 nm after annealing at 550°C for 30 min presents a magnetoimpedance of-74% at 700 kHz under H=90 Oe. The MI effect at high frequency is due to the change of Z via the variation of permeability or the penetration depth under the external field. The positive magnetoimpedance ΔZ/Z is 36% and positive magnetoresistance ΔR/R is 79% at H= 10 Oe and f=5MHz. We observe a huge magnetoreactance ΔX/X of –375% at a very low frequency of 50 kHz, which is a magnetoinduction effect due to the movement of domain wall. The smaller GMI for nanocrystalline Fe73.5Cu1Nb2V1Si13.5B9ribbons annealed above 550°C is mainly connected with the decrease of permeability due to the precipitation of Fe2B phase in ribbons. Our results show that the partial substitution of expensive Nb by cheap V in FeCuNbSiB could be a successful way to prepare the GMI materials with high performance and low cost.

scholarly journals Review on the Millimeter-Wave Generation Techniques Based on Photon Assisted for the RoF Network System

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Jiangnan Xiao ◽  
Chuang Zhao ◽  
Xingxing Feng ◽  
Xu Dong ◽  
Jiangli Zuo ◽  
...  
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Electronic Devices ◽  
Low Frequency ◽  
Digital Signal ◽  
Development Trend ◽  
Wave Generation ◽  
Communication Link ◽  
Network System ◽  
High Frequency Microwave

With the development trend of wireless and broadband in the communication link and even the whole information industry, the demand of high-frequency microwave bandwidth has been increasing. The RoF network system solves the problem of spectrum congestion in low-frequency band by providing an effective technology for the distribution of high-frequency microwave signals over optical fiber links. However, the traditional mm-wave generation technique is limited by the bandwidth of electronic devices. It is difficult to generate high-frequency and low-phase noise mm-wave signals with pure electrical components. The mm-wave communication technology based on photon assisted can overcome the bandwidth bottleneck of electronic devices and provide the potential for developing the low-cost infrastructure demand of broadband mobile services. This paper will briefly explain the characteristics of the RoF network system and the advantages of high-frequency mm-wave. Then we, respectively, introduce the modulation schemes of RoF mm-wave generation based on photon assisted including directly modulated laser (DML), external modulation, and optical heterodyne. The review mainly focuses on a variety of different mm-wave generation technologies including multifrequency vector mm-wave. Furthermore, we list several approaches to realize the large capacity data transmission techniques and describe the digital signal processing (DSP) algorithm flow in the receiver. In the end, we summarize the RoF network system and look forward to the future.

Dielectric and I-V Characteristic of Lead Titanate Thin Films Prepared on ITO Glass Substrate

2015 ◽  
Vol 1109 ◽  
pp. 461-465 ◽  
Author(s):  
Nurbaya Zainal ◽  
Mohd Hafiz Wahid ◽  
Mohammad Rusop
Keyword(s):  
Thin Films ◽  
Lead Titanate ◽  
High Performance ◽  
Annealing Temperature ◽  
Low Cost ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Ito Glass

Performance of lead titanate, (PbTiO3) thin films have been successfully investigated on microstructural properties, I-V characteristic, dielectric properties, and ferroelectric properties. PbTiO3offers variety of application as transducer, ferroelectric random access memory, transistor, high performance capacitor, sensor, and many more due to its ferroelectric behavior. Preparation of the films are often discussed in order to improve the structural properties, like existence of grain boundaries, particle uniformity, presents of microcrack films, porosities, and many more. Yet, researchers still prepare PbTiO3thin films at high crystallization temperature, certainly above than 600 ̊C to obtain single crystal perovskite structure that would be the reason to gain high spontaneous polarization behavior. Although this will results to high dielectric constant value, the chances that leads to high leakage current is a major failure in device performance. Thus, preparation the thin films at low annealing temperature quite an essential study which is more preferable deposited on low-cost soda lime glass. The study focuses on low annealing temperature of PbTiO3thin films through sol-gel spin coating method and undergo for dielectric and I-V measurements.

scholarly journals High Frequency Behavior of La0.7Sr0.3MnO3 with Giant Magnetoimpedance Effect

2002 ◽  
Vol 43 (3) ◽  
pp. 523-525 ◽  
Author(s):  
Jifan Hu ◽  
Hongwei Qin ◽  
Juan Chen ◽  
Zhenxi Wang
Keyword(s):  
High Frequency ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Frequency Behavior

scholarly journals A Facile, Low-Cost Plasma Etching Method for Achieving Size Controlled Non-Close-Packed Monolayer Arrays of Polystyrene Nano-Spheres

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 605 ◽  
Author(s):  
Yun Chen ◽  
Dachuang Shi ◽  
Yanhui Chen ◽  
Xun Chen ◽  
Jian Gao ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Silicon Nanowires ◽  
High Frequency ◽  
Low Cost ◽  
Etching Rate ◽  
Low Frequency ◽  
Etching Time ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Etching System

Monolayer nano-sphere arrays attract great research interest as they can be used as templates to fabricate various nano-structures. Plasma etching, and in particular high-frequency plasma etching, is the most commonly used method to obtain non-close-packed monolayer arrays. However, the method is still limited in terms of cost and efficiency. In this study, we demonstrate that a low frequency (40 kHz) plasma etching system can be used to fabricate non-close-packed monolayer arrays of polystyrene (PS) nano-spheres with smooth surfaces and that the etching rate is nearly doubled compared to that of the high-frequency systems. The study reveals that the low-frequency plasma etching process is dominated by a thermal evaporation etching mechanism, which is different from the atom-scale dissociation mechanism that underlines the high-frequency plasma etching. It is found that the polystyrene nano-sphere size can be precisely controlled by either adjusting the etching time or power. Through introducing oxygen as the assisting gas in the low frequency plasma etching system, we achieved a coalesced polystyrene nano-sphere array and used it as a template for metal-assisted chemical etching. We demonstrate that the method can significantly improve the aspect ratio of the silicon nanowires to over 200 due to the improved flexure rigidity.

A New High-Performance Adaptive Engine Mount

2004 ◽  
Vol 10 (1) ◽  
pp. 39-54 ◽  
Author(s):  
Mahmoud S Foumani ◽  
A. Khajepour ◽  
Mohammad Durali
Keyword(s):  
Sensitivity Analysis ◽  
Numerical Simulations ◽  
High Frequency ◽  
High Performance ◽  
Low Frequency ◽  
Engine Mount

In this paper, we introduce a new high-performance adaptive hydraulic engine mount. The mount is tuned to road and engine conditions by changing the length of the inertia track and effective decoupler area in low-frequency road and high-frequency engine excitations. A single actuator is used to tune the mount in both low-frequency and high-frequency regimes. Sensitivity analysis is used to show that changing the length of the inertia track and decoupler area is the most effective way to tune an adaptive mount. Numerical simulations indicate that the proposed design can significantly improve the performance of a passive hydraulic mount.

Scaling and Integration of High Performance Interconnects

1998 ◽  
Vol 514 ◽  
Author(s):  
Simon Yang
Keyword(s):  
Development Strategy ◽  
High Frequency ◽  
High Performance ◽  
Low Cost ◽  
Logic Circuits ◽  
High Yield ◽  
Delay Model ◽  
Trend Data ◽  
Interconnect System ◽  
Metal Layers

ABSTRACTInterconnect delay is believed to have a dominating impact on the speed of large logic circuits (such as micro-processors) when the Si technology is scaled into sub- 0.25um generations. In this paper, we analyzed interconnect scaling issues based on leading micro-processor trend data, simple RC delay model and the “Rents' rule”. It was concluded that, in order to not limit the speed of large logic circuits, “fat” metal wires need to be used for upper metal layers, which will lead to a rapid increase of required number of metal layers (>10) for sub-0.25um technology generations. Introducing Cu and low ε interconnect system can delay this rapid increase by ∼1 generation. Creating multiple clock frequencies in large logic chips and reducing the size of high frequency islands appears effective in containing the interconnection delay problem. Therefore, the proposed interconnection scaling/development strategy is to introduce Cu and low ε dielectric into manufacturing in next 1∼3 generation (0.25um∼0.13um), develop low cost and high yield interconnect system to enable ∼10 interconnect layers, and improve circuit design methodology to reduce high frequency island size.

Giant Magnetoimpedance in Fe89B4Hf7 Nanocrystalline Ribbons

2005 ◽  
Vol 475-479 ◽  
pp. 2203-2206 ◽  
Author(s):  
Xiaojun Yu ◽  
Ji Fan Hu ◽  
Dongling Wang ◽  
Hong Wei Qin ◽  
Bo Li
Keyword(s):  
Annealing Temperature ◽  
Thermal Heating ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Optimal Annealing Temperature

In this work the giant magnetoimpedance effect has been found in Fe89B4Hf7 nanocrystalline ribbons. There is an optimal annealing temperature about 650°C for obtaining a large magnetoimpedance. The magnetoimpedance can reach 208% for Fe89B4Hf7 annealed at 650°C for 20min. meanwhile, it has been found that the magnetoimpedance in FeHfB shows a good thermal- heating stability, which is useful for application.

scholarly journals Modelling and Simulation using Finite Element Method of Surface Acoustic Wave Biosensor for Gas Detection Application

2021 ◽  
Vol 2071 (1) ◽  
pp. 012022
Author(s):  
A M Noor ◽  
A N Norali ◽  
Z Zakaria ◽  
M Mazalan ◽  
Y Wahab
Keyword(s):  
Numerical Simulation ◽  
Acoustic Wave ◽  
Resonance Frequency ◽  
Surface Acoustic Wave ◽  
High Frequency ◽  
Low Cost ◽  
Computational Modelling ◽  
Low Frequency ◽  
Gas Detection ◽  
Saw Sensor

Abstract A surface acoustic wave (SAW) sensor detects changes in physical properties such as mass and density on its surface. Compared to other types of sensors, SAW sensor have a good stability, high selectivity and sensitivity, fast response, and low-cost. On the other hand, to design and optimize a SAW biosensor requires a long process including time and cost using conventional methods. Therefore, numerical simulation and computational modelling are useful and efficiently conduct analysis for the SAW biosensor. In this paper, a numerical simulation technique is used to analyse the SAW device sensitivity for the application of gas detection. The SAW biosensor can detect very small mass loading by changing its sensor resonance frequency. The two-dimensional (2D) device model is based on a two-port SAW resonator with a gas sensing layer. We made two design of SAW biosensor device with frequency of 872 MHz and 1.74 GHz. A gas with vary concentration from 1 to 100 ppm were used to determine the change of the device resonance frequency. As a result, the high frequency (1.74 GHz) device, shows that the resonance frequency is shifted larger than to the low frequency (872 MHz) device. In addition, the high frequency device offers five times more sensitivity than the low frequency device. By changing the sensor design, the sensor characteristics such as sensitivity can be altered to meet certain sensing requirements. Numerical simulation provides advantages for sensor optimization and useful for nearly representing the real condition.

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