Surface magnetic properties and giant magnetoimpedance effect in Co-based amorphous ribbons

2017 ◽  
Vol 86 ◽  
pp. 15-19 ◽  
Author(s):  
A. Chizhik ◽  
V. Vega ◽  
Abd El-Moez A. Mohamed ◽  
V.M. Prida ◽  
T. Sánchez ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Ribbons

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.

Near-surface magnetic properties and giant magnetoimpedance of Co-based amorphous ribbons

2003 ◽  
Vol 258-259 ◽  
pp. 174-176 ◽  
Author(s):  
E.E. Shalyguina ◽  
M.A. Komarova ◽  
V.V. Molokanov ◽  
Chong-Oh Kim ◽  
CheolGi Kim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Giant Magnetoimpedance ◽  
Near Surface ◽  
Amorphous Ribbons

Optimization of Magnetic Properties and Giant Magnetoimpedance Effect in Nanocrystalline Microwires

2014 ◽  
Vol 28 (3) ◽  
pp. 813-822 ◽  
Author(s):  
A. Zhukov ◽  
A. Talaat ◽  
M. Ipatov ◽  
J. J. del Val ◽  
L. Gonzalez-Legarreta ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect

scholarly journals Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1558 ◽  
Author(s):  
Lorena Gonzalez-Legarreta ◽  
Paula Corte-Leon ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Hysteresis Loops ◽  
Transverse Magnetic ◽  
Wide Frequency Range ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Annealing Temperatures ◽  
High Annealing

Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment.

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