Giant magneto-impedance effect in amorphous magnetostrictive FeSiB thin films

A simple micro-machined pressure sensor, based on the stress-impedance (SI) effect, was fabricated herein using typical micro-fabrication technologies. To sense pressure, a 1-µm thin, soft magnetic metallic film of FeSiB was sputtered and used as a diaphragm. Its electrical response (impedance change) was measured under pressure in a frequency band from 5 to 500 MHz. A lumped-element equivalent electric circuit was used to separate the impedance of the soft magnetic metal from other parasitic elements. The impedance change clearly depended on the applied pressure. It was also shown that the impedance change could be explained by a change in relative permeability, according to the theory of the SI effect. The radial stress in the diaphragm and the relative permeability exhibited a linear relationship. At a measurement frequency of 200 MHz, the largest sensor response, with a gauge factor of 385.7, was found. It was in the same order as the conventional sensors. As the proposed device is very simple, it has the potential for application as a cheap pressure sensor.

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“…The sputtered material clearly showed soft magnetic characteristics. The values were comparable with the films obtained by other groups [2,27].…”

Section: Resultssupporting

confidence: 90%

Simple Device to Measure Pressure Using the Stress Impedance Effect of Amorphous Soft Magnetic Thin Film

2020

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“…Usually, the research results could only be obtained by numerical or experimental methods. [10][11][12][13][14][15][16] In this article, the Van der Pol hysteretic model is introduced to describe the hysteretic non-linear characteristics of the GMF strain-MFI curves. The initial Van der Pol hysteretic model can be shown as follows:…”

Section: Hysteretic Non-linear Model Of Giant Magnetostrictive Mamentioning

confidence: 99%

Non-linear dynamic characteristics and optimal control of giant magnetostrictive film subjected to in-plane stochastic excitation

Zhu

Zhang

2014

AIP Advances

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The non-linear dynamic characteristics and optimal control of a giant magnetostrictive film (GMF) subjected to in-plane stochastic excitation were studied. Non-linear differential items were introduced to interpret the hysteretic phenomena of the GMF, and the non-linear dynamic model of the GMF subjected to in-plane stochastic excitation was developed. The stochastic stability was analysed, and the probability density function was obtained. The condition of stochastic Hopf bifurcation and noise-induced chaotic response were determined, and the fractal boundary of the system's safe basin was provided. The reliability function was solved from the backward Kolmogorov equation, and an optimal control strategy was proposed in the stochastic dynamic programming method. Numerical simulation shows that the system stability varies with the parameters, and stochastic Hopf bifurcation and chaos appear in the process; the area of the safe basin decreases when the noise intensifies, and the boundary of the safe basin becomes fractal; the system reliability improved through stochastic optimal control. Finally, the theoretical and numerical results were proved by experiments. The results are helpful in the engineering applications of GMF.

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“…In practice, when the thickness is reduced to 0.1 μm, the MI ratio falls significantly to 15–20% of its peak value at frequencies of 300–400 MHz [ 72 ]. MI ratios of; 5.4% in amorphous alloy FeSiB with thickness of 2.7 μm [ 58 ], 100% in 2 μm thick ferromagnetic material cobalt-niobium-zirconium (Co-Nb-Zr) [ 59 ], and 205% in nanocrystalline Fe-Cu-Nb-Si-B with thickness of 10 nm and width of 1 mm films have been reported [ 73 ].…”

Section: Factors Influencing the Magneto-impedance Effectmentioning

confidence: 99%

Magneto-Impedance Biosensor Sensitivity: Effect and Enhancement

Sayad

Skafidas

Kwan

2020

Sensors

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Biosensors based on magneto-impedance (MI) effect are powerful tools for biomedical applications as they are highly sensitive, stable, exhibit fast response, small in size, and have low hysteresis and power consumption. However, the performance of these biosensors is influenced by a variety of factors, including the design, geometry, materials and fabrication procedures. Other less appreciated factors influencing the MI effect include measuring circuit implementation, the material used for construction, geometry of the thin film sensing element, and patterning shapes compatible with the interface microelectronic circuitry. The type magnetic (ferrofluid, Dynabeads, and nanoparticles) and size of the particles, the magnetic particle concentration, magnetic field strength and stray magnetic fields can also affect the sensor sensitivity. Based on these considerations it is proposed that ideal MI biosensor sensitivity could be achieved when the sensor is constructed in sandwich thick magnetic layers with large sensing area in a meander shape, measured with circuitry that provides the lowest possible external inductance at high frequencies, enclosed by a protective layer between magnetic particles and sensing element, and perpendicularly magnetized when detecting high-concentration of magnetic particles.

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Giant magneto-impedance effect in amorphous magnetostrictive FeSiB thin films

Cited by 27 publications

References 9 publications

Simple Device to Measure Pressure Using the Stress Impedance Effect of Amorphous Soft Magnetic Thin Film

Simple Device to Measure Pressure Using the Stress Impedance Effect of Amorphous Soft Magnetic Thin Film

Non-linear dynamic characteristics and optimal control of giant magnetostrictive film subjected to in-plane stochastic excitation

Magneto-Impedance Biosensor Sensitivity: Effect and Enhancement

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