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

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Giant magneto-impedance in soft magnetic “Wires”

Journal of Magnetism and Magnetic Materials ◽

10.1016/s0304-8853(01)00013-0 ◽

2001 ◽

Vol 226-230 ◽

pp. 693-699 ◽

Cited By ~ 124

Author(s):

Manuel Vázquez

Keyword(s):

Soft Magnetic ◽

Giant Magneto Impedance ◽

Magnetic Wires

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Development of Magnetic Microwires for Magnetic Sensor Applications

Sensors ◽

10.3390/s19214767 ◽

2019 ◽

Vol 19 (21) ◽

pp. 4767 ◽

Cited By ~ 14

Author(s):

Valentina Zhukova ◽

Paula Corte-Leon ◽

Mihail Ipatov ◽

Juan Maria Blanco ◽

Lorena Gonzalez-Legarreta ◽

...

Keyword(s):

Magnetic Properties ◽

Hysteresis Loops ◽

Magnetic Sensor ◽

Internal Stresses ◽

Soft Magnetic ◽

Magnetoelastic Anisotropy ◽

Sensor Applications ◽

Gmi Effect ◽

Magnetic Softness ◽

Magnetic Wires

Thin magnetic wires can present excellent soft magnetic properties (with coercivities up to 4 A/m), Giant Magneto-impedance effect, GMI, or rectangular hysteresis loops combined with quite fast domain wall, DW, propagation. In this paper we overview the magnetic properties of thin magnetic wires and post-processing allowing optimization of their magnetic properties for magnetic sensor applications. We concluded that the GMI effect, magnetic softness or DW dynamics of microwires can be tailored by controlling the magnetoelastic anisotropy of as-prepared microwires or controlling their internal stresses and domain structure by appropriate thermal treatment.

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Influence of Magneto-Thermal Treatments on Longitudinally Driven Giant Magneto-Impedance Effect in Co-Fe-Si-B Amorphous Ribbons

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.926-930.137 ◽

2014 ◽

Vol 926-930 ◽

pp. 137-140

Author(s):

Jie Li ◽

Xin Hua Lin ◽

Xiao Hua Wang ◽

Min Tang

Keyword(s):

Magnetic Field ◽

Melt Spinning ◽

Longitudinal Magnetic Field ◽

Amorphous Ribbon ◽

Zero Magnetic Field ◽

Thermal Treatments ◽

Soft Magnetic ◽

Field Sensitivity ◽

Giant Magneto Impedance ◽

Melt Spinning Technique

Co64Fe4Si14.5B14.5amorphous ribbon was fabricated by the melt-spinning technique. Soft magnetic properties of the ribbon were improved by annealing at 623K for 1 hour with a zero magnetic field, a 50mT longitudinal or transverse external magnetic field comparing with the as-quenched ribbon. The longitudinally driven giant magneto-impedance (LDGMI) effect and its field sensitivity (ξ) have been investigated in the frequency (f) range of 1kHz~1MHz. It is found that at f=51kHz, the LDGMI effect and ξ reach the largest values for the sample annealed with a longitudinal magnetic field.

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

Physics Procedia ◽

10.1016/j.phpro.2014.10.031 ◽

2014 ◽

Vol 54 ◽

pp. 16-22 ◽

Cited By ~ 2

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

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Giant Magneto-Impedance (GMI) Effect in Single-Layer Soft Magnetic Film Under Stress

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2018.15799 ◽

2018 ◽

Vol 18 (12) ◽

pp. 8195-8200 ◽

Cited By ~ 1

Author(s):

L Zhu ◽

F Jin ◽

Y. Q Zhu ◽

J. C Wang ◽

K. F Dong ◽

...

Keyword(s):

Magnetic Field ◽

Single Layer ◽

Magnetic Film ◽

Measurement Range ◽

Impedance Change ◽

Soft Magnetic ◽

Current Frequency ◽

Gmi Effect ◽

Giant Magneto Impedance ◽

Soft Magnetic Film

The stress-induced magnetic anisotropy can significantly affect giant magneto-impedance (GMI) effect of the soft magnetic film. This paper is devoted to the GMI effect of the single layer soft magnetic film implied without and with a stress. By simulating a physical model with MATLAB and COMSOL software, the impedance expression of the single layer soft magnetic film and the relation between external magnetic field and magnetic permeability are deduced. We observed that, without a stress, the sensitive region increased firstly and then decreased with the increasing of the excitation current frequency from 1 MHz to 200 MHz. While the film was subjected to the stress in the direction of the current with one end stressed, the stress on the film was gradually reduced from stressed end to free end. Also, the impedance change rate of the film changed when the stress was added, which is similar to the effect of adding a bias magnetic field on the film. More importantly, the addition of stress σ can induce the bias of the GMI measurement range and improve its sensitivity near zero magnetic fields. This may provide a new way for designing a GMI sensor with higher sensitivity and adjustable measurement range.

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

Sensors ◽

10.3390/s20113227 ◽

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.

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