scholarly journals Giant Magnetoimpedance (GMI) Effect and Field Sensitivity of Ferrofluid Coated Co66Fe2Si13B15Cr4 Soft Magnetic Amorphous Microwire

2014 ◽  
Vol 54 ◽  
pp. 16-22 ◽  
Author(s):  
Tarun Kumar Das ◽  
Sushil Kumar Mandal ◽  
Asish Kumar Panda ◽  
Soumya Bhattacharya ◽  
Pallab Banerji ◽  
...  
Keyword(s):  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Amorphous Microwire ◽  
Gmi Effect ◽  
Field Sensitivity

scholarly journals Magnetoimpedance Response and Field Sensitivity in Stress-Annealed Co-Based Microwires for Sensor Applications

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3227
Author(s):  
David González-Alonso ◽  
Lorena González-Legarreta ◽  
Paula Corte-León ◽  
Valentina Zhukova ◽  
Mihail Ipatov ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Applied Stress ◽  
Soft Magnetic Materials ◽  
Fine Tuning ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Sensor Applications ◽  
Future Design ◽  
Gmi Effect ◽  
Field Sensitivity

Amorphous soft magnetic microwires have attracted much attention in the area of sensor applications due to their excellent properties. In this work, we study the influence of annealing treatments (stress and conventional) in the giant magnetoimpedance (GMI) response and the field sensitivity of the soft magnetic Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwires. Here we report a remarkable and simultaneous enhancement of GMI effect and field sensitivity. The highest sensitivity of 104%/Oe and the GMI response of 234% were achieved for 300 °C stress-annealed samples at 472 and 236 MPa, respectively. Additionally, we found that stress-annealed microwires exhibit a frequency dependence on maximal GMI response and field sensitivity. These findings are obtained by fine-tuning their magnetoeslastic anisotropies through stress-annealing treatments of as-prepared microwires at the proper temperature and axial applied stress upon annealing. We hope that the results presented here widen the scope of investigations for the future design of soft magnetic materials for sensor purposes.

Improvement of Giant Magneto-Impedance Effect in Fe-Based Nanocrystalline Wires

2011 ◽  
Vol 284-286 ◽  
pp. 2303-2306
Author(s):  
Su Qin Feng ◽  
Yin Feng Li ◽  
Jian Yong Wang ◽  
Chun Hui Feng ◽  
Shuang Yi Zhao ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Magnetic Sensors ◽  
Substitution Effects ◽  
Soft Magnetic ◽  
Gmi Effect ◽  
Annealing Conditions ◽  
Field Sensitivity ◽  
Hysteretic Effect ◽  
Giant Magneto Impedance ◽  
Magnetic Wires

In order to obtain materials with more ideal GMI effect, (DZ/Z）max, the substitution effects of R (R = Co, Ni and Cr) for Fe in Fe63.5R10Cu1Nb3Si13.5B9soft magnetic wires have been studied. We found that although the Finemet composition shown excellent GMI effect, the substitution of Co can raise notably the field sensitivity, Q, Ni makes a little improvements of (DZ/Z）max, and Q, and Cr diminishes the undesirable hysteretic effect. In additions, the influence of annealing conditions upon the GMI effect of the best composition Fe63.5Cr10Cu1Nb3Si13.5B9was also investigated. It indicated that the sample obtained by the ways of Joule heating under the application of suitable tensile stress exhibits 200% and 30%¤Oe for (DZ/Z）max and Q, respectively. This sample can serve as a proper choice for magnetic sensors.

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.

EFFECT OF ANNEALING ON THE GIANT MAGNETO-IMPEDANCE OF CO-BASED WIRES

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1265-1269 ◽  
Author(s):  
SHULING ZHANG ◽  
DAWEI XING ◽  
JIANFEI SUN
Keyword(s):  
Anisotropy Field ◽  
Nanocrystalline Phase ◽  
Vacuum Furnace ◽  
Giant Magnetoimpedance ◽  
Melt Extraction ◽  
Gmi Effect ◽  
Field Sensitivity ◽  
Crystalline Anisotropy ◽  
Typical Frequency ◽  
Anneal Time

The giant magnetoimpedance (GMI) effect in Co 75 Fe 4.2 Si 8 B 12 Nb 0.8 melt extraction wires annealed in a vacuum furnace at 450°C holding for 10min, 20min, 25min, 30min and 40min, respectively, is investigated. Strong GMI effect is observed at a typical frequency of 37MHz. The observation on the GMI effect indicates that the anisotropy field dominated by the anneal treatment is vital to the GMI ratio △Z/Z(%) and its field sensitivity. The improvement on GMI effect when anneal time is less than 20min is ascribed to the stress release, decreased anisotropy field and increased permeability. The decrease of GMI effect when anneal time is over 25min results from nanocrystalline phase grow up inducing the crystalline anisotropy field increase. Suitable annealed wires possess large GMI ratio (855%) and little anisotropy field achieving high field sensitivity to 151%/ Oe . These results indicate these Co -based melt extraction wires are excellent for using in novel field sensors applications.

scholarly journals Frequency and Magnetic Field Dependence of the Skin Depth in Co-rich Soft Magnetic Microwires

2016 ◽  
Vol 5 (3) ◽  
pp. 39
Author(s):  
A. Zhukov ◽  
A. Talaat ◽  
M. Ipatov ◽  
A. Granovsky ◽  
V. Zhukova
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Skin Depth ◽  
Frequency Range ◽  
Soft Magnetic ◽  
Giant Magnetoimpedance ◽  
Gmi Effect ◽  
Extended Frequency Range ◽  
Extended Frequency

We studied giant magnetoimpedance (GMI) effect in magnetically soft amorphous Co-rich microwires in the extended frequency range. From obtained experimentally dependences of GMI ratio on magnetic field and different frequencies we estimated the penetration depth and its dependence on applied magnetic field and frequency

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 effect in a positive magnetostrictive glass-coated amorphous microwire

2002 ◽  
Vol 65 (6) ◽  
Author(s):  
K. Mandal ◽  
S. Pan Mandal ◽  
M. Vázquez ◽  
S. Puerta ◽  
A. Hernando
Keyword(s):  
Giant Magnetoimpedance ◽  
Giant Magnetoimpedance Effect ◽  
Amorphous Microwire

scholarly journals Giant magnetoimpedance and field sensitivity in amorphous and nanocrystalline (Co1−xFex)89Zr7B4 (x = 0, 0.025, 0.05, 0.1) ribbons

2011 ◽  
Vol 109 (7) ◽  
pp. 07B508 ◽  
Author(s):  
Anurag Chaturvedi ◽  
Nicholas Laurita ◽  
Alex Leary ◽  
Manh-Huong Phan ◽  
Michael E. McHenry ◽  
...  
Keyword(s):  
Giant Magnetoimpedance ◽  
Field Sensitivity

scholarly journals Accurate Measurements of the Rotational Velocities of Brushless Direct-Current Motors by Using an Ultrasensitive Magnetoimpedance Sensing System

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 859 ◽  
Author(s):  
Tao Wang ◽  
Bicong Wang ◽  
Yufeng Luo ◽  
Hengyu Li ◽  
Jinjun Rao ◽  
...  
Keyword(s):  
Direct Current ◽  
Velocity Measurement ◽  
Rotational Velocity ◽  
Hall Sensor ◽  
Voltage Response ◽  
Giant Magnetoimpedance ◽  
Gmi Effect ◽  
Sensing System ◽  
Measurement Results ◽  
Large Measurement

Reports on measurements of the rotational velocity by using giant magnetoimpedance (GMI) sensors are rarely seen. In this study, a rotational-velocity sensing system based on GMI effect was established to measure rotational velocities of brushless direct-current motors. Square waves and sawtooth waves were observed due to the rotation of the shaft. We also found that the square waves gradually became sawtooth waves with increasing the measurement distance and rotational velocity. The GMI-based rotational-velocity measurement results (1000–4300 r/min) were further confirmed using the Hall sensor. This GMI sensor is capable of measuring ultrahigh rotational velocity of 84,000 r/min with a large voltage response of 5 V, even when setting a large measurement distance of 9 cm. Accordingly, the GMI sensor is very useful for sensitive measurements of high rotational velocity.

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.

Sign in / Sign up

Export Citation Format

Share Document