Domain Structure of ‘Thick’ Amorphous Microwires with Nearly Zero Magnetostriction

2001 ◽  
Vol 674 ◽  
Author(s):  
Horia Chiriac ◽  
Tibor-Adrian Óvári ◽  
Minoru Takajo ◽  
Jiro Yamasaki ◽  
Arcady Zhukov
Keyword(s):  
Domain Structure ◽  
Hysteresis Loops ◽  
Magnetic Behavior ◽  
Switching Field ◽  
Core Diameter ◽  
Metallic Core ◽  
Sensor Applications ◽  
One Step ◽  
Amorphous Microwires ◽  
First Time

ABSTRACTNearly zero magnetostrictive glass-coated amorphous microwires are suitable materials for sensor applications. Samples with metallic core diameters below 20 [.proportional]m exhibit almost nonhysteretic BH loop, related to the existence of a domain structure with azimuthal easy axis. The magnetic behavior of these microwires is changing drastically when the metallic core diameter increases over 25 [.proportional]m, i.e. they display a bistable magnetic behavior at low fields, that is a one step magnetization reversal at a certain value of the applied field, called switching field. Results on the direct domain observation in nearly zero magnetostrictive Co68.25Fe4.5Si12.25B15 glass-coated amorphous microwires by means of Kerr microscopy are reported for the first time. The effect of glass removal on the domain structure has been also studied. AC hysteresis loop measurements have been employed to establish a correlation between domain structure and magnetic behavior.Glass-coated microwires exhibit a single domain configuration with the magnetization pointing mostly to the wire axis. The domain structure does not change qualitatively after glass removal, but the parameters of the squared hysteresis loops are modified. The remanence to saturation ratio increases after glass removal, while the switching field decreases.The obtained results are of interest for sensor applications, and show that the metallic core diameter is a dimensional factor that contributes to important changes in the domain structure and magnetization process of such microwires.

Physical properties of nearly zero magnetostriction Co-rich glass-coated amorphous microwires

1999 ◽  
Vol 14 (9) ◽  
pp. 3775-3783 ◽  
Author(s):  
A. F. Cobeño ◽  
A. Zhukov ◽  
A. R. de Arellano-López ◽  
F. Elías ◽  
J. M. Blanco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hysteresis Loop ◽  
Hysteresis Loops ◽  
External Stress ◽  
Stress Dependence ◽  
Switching Field ◽  
Flat Shape ◽  
Magnetostriction Constant ◽  
Different Dimensions ◽  
Amorphous Microwires

Magnetic and mechanical properties of Co-rich amorphous microwires of nominal compositions (Co1–xMnx)75Si10 B15 (0.08 < x < 0.11) and Co56.5Fe6.5Ni10B16Si11 with nearly zero magnetostriction constant have been studied. Drastic changes of the hysteresis loop with the decrease of x from rectangular to flat shape were observed at x < 0.1, while the Co56.5Fe6.5Ni10B16Si11 microwire showed rectangular hysteresis loops. Compositions with x ≥ 0.1 have small but positive magnetostriction constant while negative λs values have been observed at x ≤ 4 0.09, indicating rectangular character of the hysteresis loop in samples with nearly zero and even for small negative λs. External stress dependence of switching field, H*, showed an increase of H*; with s for samples with x = 0.11 and a decrease of H* with σ for x = 0.1. Besides, microwires of the same composition but with different dimensions showed different H*(σ) dependencies.

scholarly journals Electrochromic Performance and Capacitor Performance of α-MoO3 Nanorods Fabricated by a One-Step Procedure

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 783
Author(s):  
Ying Duan ◽  
Chen Wang ◽  
Jian Hao ◽  
Yang Jiao ◽  
Yanchao Xu ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Average Diameter ◽  
Fast Response ◽  
Cycle Stability ◽  
Electrochromic Devices ◽  
Step Procedure ◽  
One Step ◽  
Supercapacitor Performance ◽  
First Time ◽  
Prepared Nanorods

In this paper, we propose for the first time the synthesis of α-MoO3 nanorods in a one-step procedure at mild temperatures. By changing the growth parameters, the microstructure and controllable morphology of the resulting products can be customized. The average diameter of the as-prepared nanorods is about 200 nm. The electrochromic and capacitance properties of the synthesized products were studied. The results show that the electrochromic properties of α-MoO3 nanorods at 550 nm have 67% high transmission contrast, good cycle stability and fast response time. The MoO3 nanorods also exhibit a stable supercapacitor performance with 98.5% capacitance retention after 10,000 cycles. Although current density varies sequentially, the nanostructure always exhibits a stable capacitor to maintain 100%. These results indicate the as-prepared MoO3 nanorods may be good candidates for applications in electrochromic devices and supercapacitors.

One-step synthesis of well-dispersed polypyrrole copolymers under gamma-ray irradiation

2021 ◽  
Vol 12 (5) ◽  
pp. 645-649
Author(s):  
Yu Gu ◽  
Yuqing Qiao ◽  
Yusen Meng ◽  
Ming Yu ◽  
Bowu Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gamma Ray ◽  
Gamma Ray Irradiation ◽  
One Step ◽  
First Time

Herein, we report for the first time the synthesis of polypyrrole copolymers with good solvent-dispersibility under gamma-ray irradiation at room temperature in air.

Surface magnetic behavior of nearly zero magnetostrictive Co-rich amorphous microwires

2003 ◽  
Vol 258-259 ◽  
pp. 177-182 ◽  
Author(s):  
J González ◽  
A Chizhik ◽  
A Zhukov ◽  
J.M Blanco
Keyword(s):  
Magnetic Behavior ◽  
Amorphous Microwires

The application of inexpensive and synthetic simple electrocatalyst CuFe-MoC@NG in immunosensor

The Analyst ◽  
2021 ◽  
Author(s):  
Lisha Mei ◽  
Wentang Zhao ◽  
Yiju Song ◽  
Li Zhang ◽  
Mengmeng Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Precious Metal ◽  
Doped Graphene ◽  
One Step ◽  
Metal Materials ◽  
First Time

In this study, we used inexpensive and synthetic simple electrocatalysts replacement conventional precious metal materials to reduce hydrogen peroxide (H2O2). We first time developed N-doped graphene-coated CuFe@MoC using one-step calcination...

Facile one-step mechanochemical synthesis of [Cu(tu)]Cl·1/2H2O nanobelts for high-performance supercapacitor

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38527-38532 ◽  
Author(s):  
Di Guo ◽  
Hongxu Guo ◽  
Yingchang Ke ◽  
Dongfang Wang ◽  
Jianhua Chen ◽  
...  
Keyword(s):  
Mechanochemical Synthesis ◽  
Electrode Material ◽  
High Performance ◽  
Mechanochemical Process ◽  
One Step ◽  
First Time

A facile one-step mechanochemical process from CuCl2·2H2O and thiourea to fabricate novel [Cu(tu)]Cl·1/2H2O nanobelts has been observed for the first time, and the nanobelts were used as an electrode material for a supercapacitor.

scholarly journals Isolation and Identification of Vibrio cholerae causes Epidemic cholera 2007 in Iraq by Rapid Method (Immunochromatographic one step rapid visual test) and comparing it with the traditional Bacterlogical Methods

2011 ◽  
Vol 8 (1) ◽  
pp. 29-34
Author(s):  
Baghdad Science Journal
Keyword(s):  
Vibrio Cholerae ◽  
Rapid Method ◽  
Fast Method ◽  
Visual Test ◽  
Cultural Characteristics ◽  
Isolation And Identification ◽  
One Step ◽  
Anti Body ◽  
First Time ◽  
Cultural Media

This study was for searching for Cholera Bacteria serotype which causes epidemiology Cholera in the 2007 in a fast method which contains (Rapid Visual Test) (Crystal V.C.) which was used for the first time in Iraq to diagnosis of Cholera Bacteria & compared with the traditional bacteriology method. The Cholera disease is one of the most dangerous epidemiological diseases which lead to death with a percentage of (50 – 70) % in the severe cases for untreated patients . For this purpose, 100 samples of stool from the patients from a (13) hospitals in Baghdad Governorate in the period from August to the end of December. The Cholera was diagnosis in two methods, 1st method was the fast method using the nitrocellulose which is coated with anti-body of Cholera Bacteria .The results was compared with the 2nd method which depends on the cultural characteristics of the cultural media, also the bacteria was diagnosis using the biochemical inspects by the system of API 20E in addition to the using of antisera to specify serotype& sub-serotype ( Monovalent, Polyvalent(O1) . Also, the relation between the disease & the months in the year in which the disease appear was studied. The results show the ability to isolate & identifecate (78) isolate for the serotype (01) in the fast method ( Rapid Visual Test ) ( Crystal V-C ) , & after the bacteriology inspects on these (78) isolate the all isolates were belongs for Cholera Bacteria of the serotype (01) till the sub-serotype , all the (78) isolates were belongs to the sub-serotype (Inaba). The results show, the most infection was in September (36) , & October (22).

Lawyers in the Field

2002 ◽  
Vol 26 (3) ◽  
pp. 248-253
Author(s):  
Neil Hasser
Keyword(s):  
Drinking Water ◽  
Heat Waves ◽  
Heat Exhaustion ◽  
Physical Limit ◽  
One Step ◽  
First Time ◽  
Provide Drinking Water

The weather during the harvest season in Virginia can be brutal. During one of the worst heat waves in decades, with temperatures soaring above 100 degrees, we were notified about a farmworker named Juan who had died in the field. We left immediately for the camp to speak with other workers about the circumstances. The day before, the grower had been visited and warned by an official about failing to provide drinking water and cups for the workers, not the first time he had received warnings of field negligence. Even on days when water was available, access could be difficult. When the water truck would drive by, workers in the field had to quickly grab one of the vegetables they were picking, cut it in half to use as a drinking cup, and run after the water truck before it left for the adjoining field. We also learned about the implicit understanding between this man's crewleader and the workers: choosing when to take a rest on your own meant no work the following day. You would also be one step closer to being blacklisted from future employment. When Juan had finally reached his physical limit that day, he asked for some time to rest inside the bus, but it was too late. He later died at the hospital from what appeared to be the effects of heat exhaustion. It remains to be seen whether Juan's family will receive any compensation.

scholarly journals Ionic Liquids-Containing Silica Microcapsules: A Potential Tunable Platform for Shaping-Up Epoxy-Based Composite Materials?

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 881
Author(s):  
Ting Shi ◽  
Sébastien Livi ◽  
Jannick Duchet ◽  
Jean-François Gérard
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Diameter Distribution ◽  
Excellent Thermal Stability ◽  
Transmission Electron ◽  
Micron Size ◽  
Phosphonium Ionic Liquid ◽  
One Step ◽  
The One ◽  
First Time

In this work, silica microcapsules containing phosphonium ionic liquid (IL), denoted SiO2@IL, were successfully synthesized for the first time using the one step sol-gel method in IL/H20 emulsion. The morphologies of the obtained micron-size microcapsules, including their diameter distribution, were characterized using dynamic light scattering (DLS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The thermal behavior of these microcapsules and the mass fraction of the encapsulated IL in the silica microcapsules were determined using thermogravimetric analysis, showing an excellent thermal stability (up to 220 °C) and highlighting that an amount of 20 wt.% of IL is contained in the silica microcapsules. In a second step, SiO2@IL microcapsules (1 wt.%) were dispersed into epoxy-amine networks to provide proof of concept of the ability of such microcapsules to act as healing agents as microcracks propagate into the epoxy networks.

Sign in / Sign up

Export Citation Format

Share Document