scholarly journals Reversible and Non-Reversible Transformation of Magnetic Structure in Amorphous Microwires

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1450
Author(s):  
Alexander Chizhik ◽  
Julian Gonzalez ◽  
Arcady Zhukov ◽  
Przemyslaw Gawronski ◽  
Mihail Ipatov ◽  
...  
Keyword(s):  
Magnetic Structure ◽  
Domain Walls ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Reversible Transformation ◽  
Domain Structures ◽  
Domain Wall Velocity ◽  
Geometric Ratio ◽  
Amorphous Microwires ◽  
Selection Of

We provide an overview of the tools directed to reversible and irreversible transformations of the magnetic structure of glass-covered microwires. The irreversible tools are the selection of the chemical composition, geometric ratio, and the stress-annealing. For reversible tuning we use the combination of magnetic fields and mechanical stresses. The studies were focused on the giant magnetoimpedance effect and the velocity of the domain walls propagation important for the technological applications. The essential increase of the giant magnetoimpedance effect and the control of the domain wall velocity were achieved as a result of the use of two types of control tools. The performed simulations reflect the real transformation of the helical domain structures experimentally found.

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.

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

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.

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