Influence of magnetization processes and device geometry on the GMI effect

Barandiarán, J.M.; Garcı́a-Arribas, A.; Muñoz, Josep Lluís García; Kurlyandskaya, G.V.

doi:10.1109/tmag.2002.802436

Cited by 40 publications

(25 citation statements)

References 27 publications

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“…Note that this result coincides with that obtained previously by using simple estimations [17,19]. The optimum shell thickness is shown in Fig.…”

Section: Resultssupporting

confidence: 91%

“…In this connection, the composite wires may have, in principle, more soft magnetic properties, which is key factor for magnetic-field sensors. In contrast to amorphous wires, the GMI effect in the composite wires is not restricted by the change of the skin depth under the influence of the external magnetic field [19]. In this case, the GMI effect is mainly driven by the inductance of the shell and the resistance of the core.…”

Section: Introductionmentioning

confidence: 97%

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Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Buznikov¹,

Антонов²,

Granovsky³

et al. 2006

Journal of Magnetism and Magnetic Materials

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The giant magnetoimpedance effect in composite wires consisting of a non-magnetic inner core and soft magnetic shell is studied theoretically. It is assumed that the magnetic shell has a helical anisotropy. The current and field distributions in the composite wire are found by means of a simultaneous solution of Maxwell equations and the Landau-Lifshitz equation. The expressions for the diagonal and off-diagonal impedance are obtained for low and high frequencies. The dependences of the impedance on the anisotropy axis angle and the shell thickness are analyzed. Maximum field sensitivity is shown to correspond to the case of the circular anisotropy in the magnetic shell. It is demonstrated that the optimum shell thickness to obtain maximum impedance ratio is equal to the effective skin depth in the magnetic material.

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“…Note that this result coincides with that obtained previously by using simple estimations [17,19]. The optimum shell thickness is shown in Fig.…”

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 97%

Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Buznikov¹,

Антонов²,

Granovsky³

et al. 2006

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

show abstract

“…The pure theoretical analysis allows gaining insight in the involved phenomena, but fails to accurately describe the experimental results. In fact, the theory predicts values for the MI ratio of the order of 10 4 % [61,62] that have never, by far, been observed. This discrepancy is caused first by nonideal conditions on real samples: complex domain structure, finite size, etc.…”

Section: Numerical Simulations By Finite Element Methodsmentioning

confidence: 85%

Thin-Film Magneto-Impedance Sensors

Garcı́a-Arribas¹,

Férnández²,

Cos³

2017

Magnetic Sensors - Development Trends and Applications

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We review the state-of-the-art of thin films displaying the magneto-impedance (MI) effect, with focus on the aspects that are relevant to the successful design and operation of thin film-based magnetic sensors. After a brief introduction of the MI effect, the materials and geometries that maximize the performance, together with the measurement procedure for their characterization, are exposed. A nonexhaustive survey of applications is included, mostly with the aim of displaying the capabilities of thin film structures in the field of magnetic sensing, and the variety of topics covered by them. A special emphasis is made on some concepts that are not commonly treated in the literature, such as the influence of the measuring circuit on the magneto-impedance ratio, the geometry optimization by means of numerical simulation by finite element methods, or noise measurements on thin films. Additionally, a brief description of the patterning procedure by photolithography is included, since the major advantage of thin film sensors over other types of magneto-impedance materials as ribbons or wires is the possibility of patterning the sensible element in micrometric shapes, and most of all, their easy integration with the interface microelectronic circuitry.

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“…The maximal values of relative change in annealed samples impedance module were registered at driving frequencies of 3-4 MHz. Such maximal values were caused by decrease in magnetic permeability at higher frequencies [6].…”

Section: Resultsmentioning

confidence: 95%

Study of Stress-Annealing Enhancement of Magnetoimpedance Effect in Fe_89.8Ni_1.5Si_5.2B₃C_0.5Metallic Glass Ribbons

et al. 2008

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In this study, the magnetoimpedance effect in magnetically soft Fe89.8Ni1.5Si5.2B3C0.5 metallic glass ribbon samples with significant decrease in atomic percentage of metalloids content (less than 10 at.%) was investigated. Thermal treatments were performed by stress-annealing technique of up to 693 K/475 MPa/30 min. The critical frequency of about 600 kHz was observed as the point with the initial increase in magnetoimpedance ratio. Significant improvement of magnetoimpedance-response reaching the value ∆Z/Z = 25% after stress-annealing at 693 K/130 MPa/30 min was recorded in samples with still amorphous structure at driving frequency of 4 MHz. The highest magnetoimpedance-element sensitivity was found for low magnetic field intensity (H ≤ 1 kA/m), where values of about 12%/kA/m were attained.

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Influence of magnetization processes and device geometry on the GMI effect

Cited by 40 publications

References 27 publications

Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Thin-Film Magneto-Impedance Sensors

Study of Stress-Annealing Enhancement of Magnetoimpedance Effect in Fe_89.8Ni_1.5Si_5.2B₃C_0.5Metallic Glass Ribbons

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Influence of magnetization processes and device geometry on the GMI effect

Cited by 40 publications

References 27 publications

Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy

Thin-Film Magneto-Impedance Sensors

Study of Stress-Annealing Enhancement of Magnetoimpedance Effect in Fe89.8Ni1.5Si5.2B3C0.5Metallic Glass Ribbons

Contact Info

Product

Resources

About

Study of Stress-Annealing Enhancement of Magnetoimpedance Effect in Fe_89.8Ni_1.5Si_5.2B₃C_0.5Metallic Glass Ribbons