Giant magneto-impedance and its applications

Abstract

The status of Giant Magneto-Impedance effect is reviewed in wires, ribbons and multilayered soft ferromagnetic thin films. After establishing the theoretical framework for the description of the effect, and the constraints any material should have in order to show the effect, experimental work in wires, ribbons and multilayered thin films is described. Existing and potential applications of the effect in electronics and sensing are highlighted.

Data Acquisition and Pretreatment of Gastric Magnetic Signal Based On the Giant Magneto Impedance Effect

“…Slow wave has low frequency, it is about 0.05Hz, fast wave has the higher frequency, it is about 1.3~2Hz [2]. The attenuation is very small when gastric magnetic fast wave produced by gastric electrical fast wave pass the tissue, so this paper uses the giant magneto impedance (Giant Magneto-Impedance effect, GMI) sensor array to obtain gastric magnetic signal, and then extract the key technology of gastric electrical fast information, this will play an important role in capturing the problem, which cannot detect the domain gastric fast wave signal from body surface, and it is a new methods to explore the function of stomach disease [3]. It is a very meaningful exploration.…”

Interplay of stress, temperature, and giant magnetoimpedance in amorphous soft magnets

“…1,2 Among many of these future applications, Giant Magnetoimpedance (GMI)-based sensors have generated interest due to their low cost, ease of operation, and sensitivity that exceeds currently available sensing devices. 3,4 Capable of detecting field as low as 10 À8 Oe, GMI-based sensors are significantly more sensitive than Fluxgate, Giant Magnetoresistance (GMR), or Hall Effect sensors. 4 To meet the rapid growth of world energy demand, advanced drilling and detection technologies are necessary to increase oil and gas production.…”

“…[9][10][11] The GMI effect is defined as the change in the electrical impedance of a material under an AC field in the presence of a DC applied magnetic field. 3,4 The GMI ratio (in %), as function of applied field, H, is expressed…”

“…3,4 In the low frequency (<100 kHz) and high frequency (>10 MHz) regime, the GMI effect mostly reflects the magnetoinductance effect and ferromagnetic relaxation, respectively. 4 Between these two frequency regimes ($100 kHz to $10 MHz), the contribution to the GMI arises mostly from a phenomenon called the skin effect, which is characterized by a skin depth (d m )…”

Homogeneização Das Características De Fase De Amostras Gmi Para Leitura Gradiométrica

“…O efeito da Magnetoimpedância Gigante (GMI) é caracterizado pela variação da impedância de uma amostra de material amorfo de acordo com o campo magnético que o atravessa [1]. Estudos sobre esse tema têm sido intensificados desde os anos 1990, devido a vantagens como o baixo custo para produção em escala, a boa sensibilidade e a grande faixa de frequências de operação apresentados por essas amostras.…”