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.

Magnetic Properties and the Giant Magneto-Impedance in Joule-Heated Glass-Covered Co-Based Microwire

2009 ◽  
Vol 79-82 ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Tian ◽  
L.H. Wang ◽  
L.Y. Zhou
Keyword(s):  
Magnetic Properties ◽  
Induced Anisotropy ◽  
Soft Magnetic ◽  
Applied Current ◽  
Giant Magnetoimpedance ◽  
Maximum Slope ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Microwires ◽  
Dc Current ◽  
Heated Glass

The influence of DC current annealing on magnetic properties and 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. Under a certain annealing condition (10 min annealing with applied current Ia=110 mA), the maximum change of impedance was about 200% with a maximum slope sensitivity of 0.26%/Am-1 . Further treatment with increased current resulted in a decrease of the maximum MI ratio. Meanwhile, annealing can produce short-range order relaxation and consequently improves the sample's soft magnetic properties. We also found that the GMI ratio increased due to the enhanced induced anisotropy with increasing current under the same Joule energy.

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.

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

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

Giant magnetoimpedance effect in soft magnetic wires for sensor applications

1997 ◽  
Vol 59 (1-3) ◽  
pp. 20-29 ◽  
Author(s):  
M. Vázquez ◽  
M. Knobel ◽  
M.L. Sánchez ◽  
R. Valenzuela ◽  
A.P. Zhukov
Keyword(s):  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Sensor Applications ◽  
Magnetic Wires
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