Magnetoimpedance in soft magnetic amorphous and nanostructured wires

Sánchez, M.L.; Prida, V.M.; Santos, Joana; Olivera, J.; Sánchez, T.; Garcı́a, J.A.; Pérez, M.J.; Hernando, B.

doi:10.1007/s00339-011-6245-z

Cited by 10 publications

(5 citation statements)

References 48 publications

(61 reference statements)

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“…If m > j (m < j), then the impedance tends to infinity (zero) when f goes to infinity. Note that the error is minimum for the case of m = j and the zeros of J 1 are larger than J 0 according to the property established in (6). Thus, in the impedance described by (8), the influence of every zero b 0,i is canceled out by a higher pole b 1,i leading to a constant.…”

Section: The New Model Of the Sensormentioning

confidence: 93%

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A novel magneto‐impedance sensor model based on the zeros of Bessel functions

Vargas-Bernal¹,

Blas

Gómez‐Polo

2014

Circuit Theory & Apps

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Summary Nowadays, the design of magneto‐impedance (MI) sensors requires the development of lumped circuit models that can be simulated through equivalent impedance circuits relied on Bessel functions. A new impedance model based on Senani's equivalent using the zeros of Bessel functions is developed in this paper. The model allows to describe the impedance as a transfer function that can be easily synthesized by means of current conveyor circuits and passive elements. The mathematical representation was verified under simulation of transfer functions involving different number of poles and zeros. Moreover, the model has been verified using SPICE simulations and measurement results from a fabricated prototype demonstrating its scope and validity. Finally, a study of finite tracking errors of CCIIs used in the implementation of magneto‐impedance sensor has been realized. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: The New Model Of the Sensormentioning

confidence: 93%

“…In particular, different electromagnetic materials have been used to fabricate magneto-impedance sensors based on single wire or multi-wires [5][6][7][8][9][10]. Moreover, several efforts have been realized to model and obtain an equivalent circuit that can be used to implement magneto-impedance sensors [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A novel magneto‐impedance sensor model based on the zeros of Bessel functions

Vargas-Bernal¹,

Blas

Gómez‐Polo

2014

Circuit Theory & Apps

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“…The ac longitudinal magnetization generates a voltage in the coil which is used as the output in off‐diagonal MI sensor. A sensitive off‐diagonal MI was realized in amorphous wires with circular or helical anisotropy , in ribbons with in‐plane anisotropy induced by annealing or field quenching , and in multilayers with spiral anisotropy .…”

Section: Principles Of Off‐diagonal MI Sensorsmentioning

confidence: 99%

“…In order to obtain a non‐zero

μ_{φ z}

component, the static magnetization needs to be helical. This is realized in systems with a helical magnetic anisotropy induced, for example, by torque‐annealing and is used in inverse Wiedemann effect elements . In the case of a circumferential anisotropy, the application of a dc bias current is needed.…”

Section: Principles Of Off‐diagonal MI Sensorsmentioning

confidence: 99%

Off‐diagonal magnetoimpedance in amorphous microwires for low‐field magnetic sensors

Panina

Yudanov

Морченко

et al. 2015

Physica Status Solidi (a)

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Magnetoimpedance (MI) in amorphous wires is widely used for the development of various sensors and smart composites with sensing functionalities. In the case of sensor applications, MI in off-diagonal configuration has a number of advantages including linearity, enhanced output voltage sensitivity, efficient resonance, or differential excitation schemes. In this article, we discuss the fundamentals of the off-diagonal MI in amorphous microwires, working principles, and design of miniature MI magnetic sensors. Considering the electrodynamic origin of MI, a comparison with orthogonal fluxgates is made with the purpose to suggest improvements in MI sensor design. This includes multi-wire configuration and suppression of the voltage offset caused by magnetic anisotropy helicity. New results on the heating effects reveal that the temperature stability along with sensitivity may be enhanced by annealing. The paper focus is aimed to demonstrate that the off-diagonal MI sensors have a high potential for improvements in terms of output voltage sensitivity, magnetic field resolution and temperature stability. 1 Introduction The magnetoimpedance (MI) in soft magnetic conductors demonstrating a very high sensitivity over a wide range of operating frequencies has been recently employed for the development of miniature sensors to detect extremely low magnetic fields, for example, the fields generated by electrical processes of the human heart (MCG [1, 2]). The MI effect includes an enormous change in the high frequency voltage across a magnetic conductor caused by the application of low magnetic fields in the range of few Oersted. In this respect, it can be compared with giant magnetoresistance but high operating frequencies require completely different MI sensor construction. It appears that a simple scheme of measuring the voltage across the MI material involves a number of difficulties associated with nonlinear MI characteristics and relatively low output voltage sensitivity. This scheme, however, is successfully used with thin-film MI materials combined with permanent magnetic layers to shift the operating field point [3-5].

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“…The magnetoimpedance (MI) effect is understood as a significant change of the impedance Z of a magnetically soft conductor upon the application of an external magnetic field. The MI effect has received a strong interest since its rediscovery 1, 2 due to its prospective applications in highly sensitive, small‐size and low‐cost magnetic sensors 3–9. This phenomenon can be understood in the frame of classical electrodynamics that at medium and high frequencies is described in terms of the skin‐depth effect that depends on magnetic permeability of the conductor 10.…”

Section: Introductionmentioning

confidence: 99%

1D and 2D position detection using magnetoimpedance sensor array

Ipatov

Zhukova

Blanco

et al. 2012

Physica Status Solidi (a)

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We have investigated the application of the magnetoimpedance (MI) effect in amorphous microwires for absolute position detection and demonstrated that MI elements arranged in 1D and 2D arrays can be used for contactless proximity and position sensing of a magnetic label attached to an object to be detected. Owing to the high sensitivity of the MI elements to the stray magnetic field produced by the magnetic label, the required density of the MI elements can be rather low, which allows the designing of low‐cost in situ reconfigurable sensor networks. An example of application of a 2D proximity and position sensing device for wireless power transfer is considered.

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Magnetoimpedance in soft magnetic amorphous and nanostructured wires

Cited by 10 publications

References 48 publications

A novel magneto‐impedance sensor model based on the zeros of Bessel functions

A novel magneto‐impedance sensor model based on the zeros of Bessel functions

Off‐diagonal magnetoimpedance in amorphous microwires for low‐field magnetic sensors

1D and 2D position detection using magnetoimpedance sensor array

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