scholarly journals Magnetization and Giant Magnetoimpedance Effect of Co-Rich Microwires under Different Driven Currents

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Shengdi Sun ◽  
Shuling Zhang ◽  
Bo Zhang ◽  
Wenjie Ding
Keyword(s):  
Kerr Effect ◽  
Skin Effect ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Gmi Effect ◽  
Driving Current ◽  
Key Factor ◽  
Ac Current ◽  
Amorphous Microwires ◽  
Melt Extraction Method

Co68.25Fe4.5Si12.25B15amorphous microwires with a diameter of 34 μm were prepared via the melt extraction method. The dependency of AC driving currentIacand frequency on giant magnetoimpedance (GMI) effect and magnetization were investigated using a 4294A impedance analyzer and the transverse Kerr effect. The GMI effect was analyzed whenIacchanged from 6 mA to 20 mA at a frequency ranging from 0.1 MHz to 15 MHz. The influence of AC current dependent on the frequency is correlated with the magnetization mechanism. The maximum transverse Kerr intensity (MTKI) decreased with the increase inIacunder direct magnetic field when the frequency was below megahertz. However, MTKI values were similar with the increase ofIacwhen it was over 2 MHz. Meanwhile, the GMI effect was optimized by selecting an adequate value of AC driving currentIp, at which the circular permeability was higher when the frequency was not over 2 MHz. Results showed that the influence ofIacon magnetoimpedance became weak with strong skin effect and slightly stronger GMI effect driven by a higherIacwhen the frequency was between 2 MHz and 15 MHz. The skin effect turned out to be the key factor to the GMI effect; thus, there were no obvious differences in magnetization and GMI effect with AC driving current changing when the frequency was as high as 15 MHz.

Influence of AC Driving Current on Magneto-Impedance Effect in Glass-Covered Co-Based Microwire

2011 ◽  
Vol 335-336 ◽  
pp. 324-327
Author(s):  
Bin Tian ◽  
Hua Shi
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Giant Magnetoimpedance ◽  
Double Peak ◽  
Giant Magnetoimpedance Effect ◽  
Driving Current ◽  
Ac Current ◽  
Amorphous Microwires ◽  
The Magnetic Field ◽  
Range Of Values

The influence of ac driving current on the frequency dependence in the range from 0.1 to 20 MHz of the giant magnetoimpedance effect (GMI) of glass-covered amorphous microwires were investigated. The dependence of GMI for a range of values of ac current (from 0.5 mA to 20 mA) flowing along the microwire has been measured in as-prepared samples. The double-peak feature is changed to the single-peak festure and the magnetic field at which the value of GMI reaches a maximum should increase with the higher the amplitude of the ac at low frequency. It was found that the change of GMI related to circular coercivity.

scholarly journals Scattering of Microwaves by a Passive Array Antenna Based on Amorphous Ferromagnetic Microwires for Wireless Sensors with Biomedical Applications

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3060
Author(s):  
Alberto Moya ◽  
Diego Archilla ◽  
Elena Navarro ◽  
Antonio Hernando ◽  
Pilar Marín
Keyword(s):  
Biomedical Applications ◽  
High Sensitivity ◽  
Bias Field ◽  
Giant Magnetoimpedance ◽  
Scattering Parameter ◽  
Giant Magnetoimpedance Effect ◽  
Radiation Theory ◽  
Temperature Detector ◽  
Frequency Sweeps ◽  
Amorphous Microwires

Co-based amorphous microwires presenting the giant magnetoimpedance effect are proposed as sensing elements for high sensitivity biosensors. In this work we report an experimental method for contactless detection of stress, temperature, and liquid concentration with application in medical sensors using the giant magnetoimpedance effect on microwires in the GHz range. The method is based on the scattering of electromagnetic microwaves by FeCoSiB amorphous metallic microwires. A modulation of the scattering parameter is achieved by applying a magnetic bias field that tunes the magnetic permeability of the ferromagnetic microwires. We demonstrate that the OFF/ON switching of the bias activates or cancels the amorphous ferromagnetic microwires (AFMW) antenna behavior. We show the advantages of measuring the performing time dependent frequency sweeps. In this case, the AC-bias modulation of the scattering coefficient versus frequency may be clearly appreciated. Furthermore, this modulation is enhanced by using arrays of microwires with an increasing number of individual microwires according to the antenna radiation theory. Transmission spectra show significant changes in the range of 3 dB for a relatively weak magnetic field of 15 Oe. A demonstration of the possibilities of the method for biomedical applications is shown by means of wireless temperature detector from 0 to 100 °C.

Giant Magnetoimpedance Effect in a Co-Based Microwire for Quick-Response Magnetic Sensor Applications

Volume 3 ◽  
2004 ◽  
Author(s):  
Manh-Huong Phan ◽  
Hua-Xin Peng ◽  
Michael R. Wisnom ◽  
Seong-Cho Yu
Keyword(s):  
Giant Magnetoimpedance ◽  
New Approach ◽  
Giant Magnetoimpedance Effect ◽  
Sensor Applications ◽  
Sensing Applications ◽  
Stress Sensors ◽  
Field Sensitivity ◽  
Amorphous Microwires ◽  
Dc Current ◽  
Linear Field

Development of autobiased linear field sensors based on asymmetrical giant magnetoimpedance (AGMI) effect in Corich amorphous microwires upon the application of a biasing dc current is approached. Upon biasing dc currents, the highest field sensitivity of AGMI of 20%/Oe was found at a biasing dc current of 10 mA. The reduction of the AGMI under a biasing dc current of 25 mA and a frequency of 10 MHz has been observed. The result indicates that an optimum design of autobiased linear field sensors based on AGMI can be achieved by applying the biasing dc current of 10 mA and in the frequency range of 100 kHz–5 MHz. A stress-induced change in AGMI has also been found in these microwires and this offers a new approach to the development of stress sensors. All these features make the Co-rich amorphous microwire a multifunctional and smart material that can be used for different purposes of sensing applications.

GIANT MAGNETOIMPEDANCE EFFECT IN AS-DEPOSITED (Fe88Zr7B5)0.97Cu0.03 AMORPHOUS FILMS

2005 ◽  
Vol 19 (21) ◽  
pp. 3405-3412
Author(s):  
WEI-PING CHEN ◽  
SHU-QIN XIAO ◽  
YI-HUA LIU
Keyword(s):  
Amorphous Film ◽  
Close Correlation ◽  
Soft Magnetic ◽  
Amorphous Films ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Gmi Effect ◽  
Radio Frequency Sputtering ◽  
Transverse Permeability ◽  
Frequency Dependences

The giant magnetoimpedance (GMI) effect has been observed in as-deposited ( Fe 88 Zr 7 B 5)0.97 Cu 0.03 amorphous film prepared by radio frequency sputtering. The maximum magnetoimpedance ratio of 17% was obtained at a frequency of 13 MHz. The field and frequency dependences of magnetoimpedance, magnetoresistance, magnetoreactance and transverse permeability have been investigated in detail. Our results show that a close correlation between longitudinal GMI and transverse permeability exists. Our results indicate that the amorphous ( Fe 88 Zr 7 B 5)0.97 Cu 0.03 films have good soft magnetic properties and remarkable GMI effect even though in the as-deposited state.

scholarly journals Giant magnetoimpedance effect at GHz frequencies in amorphous microwires

AIP Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 125333 ◽  
Author(s):  
A. Zhukov ◽  
L. Gonzalez-Legarreta ◽  
M. Ipatov ◽  
P. Corte-Leon ◽  
J. M. Blanco ◽  
...  
Keyword(s):  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Microwires

scholarly journals Magnetic properties and giant magnetoimpedance effect for CoFeMoSiB surface modified amorphous ribbons covered by water based ferrofluid

2018 ◽  
Vol 185 ◽  
pp. 10003
Author(s):  
Zahra Lotfollahi ◽  
Ahmad Amirabadizadeh ◽  
Alexander P. Safronov ◽  
Galina V. Kurlyandskaya
Keyword(s):  
Magnetic Properties ◽  
Surface Modification ◽  
Average Diameter ◽  
Ultrasound Treatment ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Gmi Effect ◽  
Amorphous Ribbons ◽  
Water Based ◽  
Surface Modified

Giant magnetoimpedance (GMI) effect is a powerful technique for magnetic label detection. Co-based amorphous ribbons are cheap materials showing high GMI effect at low operation frequencies for close to zero magnitostriction compositions. In this work magnetic properties and GMI were studied for CoFeMoSiB amorphous ribbons in as-quenched and surface modified states without and in the presence of water-based ferrofluid with electrostatic stabilization of γ-Fe2O3 nanoparticles. Surface modification by ultrasound treatment resulted in appearance of round defects with average diameter of about 150 micrometers. The GMI difference for as-quenched ribbons in absence and in the presence of ferrofluid was measured for the frequency range of 0.5 to 10 MHz. Although proposed surface modification by the ultrasound treatment did not improve the sensitivity limit for ferrofluid detection, it did not decrease it either. Observed changes of GMI are useful for understanding of functionality of GMI biosensors.

Studies of High-Frequency Giant Magnetoimpedance Effect in Co-Rich Amorphous Microwires

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Arcady Zhukov ◽  
Mihail Ipatov ◽  
Ahmed Talaat ◽  
Juan M. Blanco ◽  
Margarita Churyukanova ◽  
...  
Keyword(s):  
High Frequency ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Microwires
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