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 Engineering of giant magnetoimpedance effect of amorphous and nanocrystalline microwires

2016 ◽  
Vol 5 (3) ◽  
pp. 63
Author(s):  
V. Zhukova ◽  
A. Talaat ◽  
M. Ipatov ◽  
A. Granovsky ◽  
A. Zhukov
Keyword(s):  
Magnetic Properties ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Magnetoelastic Anisotropy ◽  
Giant Magnetoimpedance Effect ◽  
Factors Affecting ◽  
Gmi Effect ◽  
Magnetic Softness

We present our studies of the factors affecting soft magnetic properties and giant magnetoimpedance effect in thin amorphous and nanocrystalline microwires. We showed that the magnetoelastic anisotropy is one of the most important parameters that determine magnetic softness and GMI effect of glass-coated microwires  and annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Considerable magnetic softening and increasing of the GMI effect is observed in Fe-rich nanocrystalline FINEMET-type glass-coated microwires after the nanocrystallization.

Giant Magnetoimpedance in as Quenched Fe Based Nanocrystalline Ribbons

2005 ◽  
Vol 475-479 ◽  
pp. 2219-2222 ◽  
Author(s):  
Ji Fan Hu ◽  
Hong Wei Qin ◽  
Minhua Jiang ◽  
Bo Li ◽  
Dongliang Zhao ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Materials ◽  
Melt Spinning ◽  
Experimental Results ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Additional Annealing ◽  
Melt Spinning Technique

FeCuNbSiB and FeZrBCu nanocrystalline ribbons can be obtained directly through the melt- spinning technique without additional annealing processes. The giant magnetoimpedance can be observed in FeCuNbSiB and FeZrBCu as quenched ribbons. The addition of Cu improves the nano-crystallization of a-Fe(Si) or a-Fe phase and reduces the grain size in FeCuNbSiB and FeZrBCu as quenched ribbons, which enhances the magnetoimpedance via increasing the variation of permeability under fields. The present experimental results reveal a novel route to fabricate the Fe based nanocrystalline soft magnetic materials with 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.

GIANT MAGNETOIMPEDANCE EFFECT IN MULTILAYERED STRUCTURE (FM/SiO2)3/Ag/(SiO2/FM)3 FILMS

2005 ◽  
Vol 19 (30) ◽  
pp. 4475-4482
Author(s):  
WEI-PING CHEN ◽  
SHU-QIN XIAO ◽  
WEN-JING WANG ◽  
HUI-MIN YUAN ◽  
YI-HUA LIU
Keyword(s):  
Magnetic Field ◽  
Deposition Process ◽  
Transverse Magnetic ◽  
Multilayered Structure ◽  
Giant Magnetoimpedance ◽  
Multilayered Films ◽  
Giant Magnetoimpedance Effect ◽  
Radio Frequency Sputtering ◽  
Maximum Value ◽  
Different Temperatures

Giant magnetoimpedance (GMI) and giant magnetoreactance (GMX) effects in multilayered structure ( FM/SiO 2)3/ Ag /( SiO 2/ FM )3( FM ≡ Fe 71.5 Cu 1 Cr 2.5 V 4 Si 12 B 9) films have been studied. The multilayered films were deposited by radio frequency sputtering under a constant magnetic field of 900 Oe applied in the plane of the sample perpendicular to its long side (transverse direction) and then annealed under different temperatures. The maximum GMI ratio of 122% was obtained at the frequency of 4.6 MHz. The maximum value of GMX ratio and the sensitivity of GMX ratio, 2578% and 129%/Oe, were obtained in a longitudinal field case at the frequency of 1 MHz, respectively. These superior properties are related to the special structure of the multilayered films and the transverse magnetic field used in the deposition process.

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.

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