Optimization of the giant magnetoimpedance effect of Finemet-type microwires through the nanocrystallization

Talaat, A.; Zhukova, V.; Ipatov, M.; Blanco, J.M.; González-Legarreta, Lorena; Hernando, B.; Val, J. J. del; González, J.; Zhukov, А.

doi:10.1063/1.4863484

Cited by 38 publications

(8 citation statements)

References 23 publications

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“…Such interpretation has been confirmed by X-ray diffraction studies of as-prepared samples and samples annealed at different temperatures (Talaat et al, 2014a;Zhukov et al, 2014c;Talaat et al, 2014a;Figure 8.25). This magnetic softening is related to the nanocrystallization process due to the precipitation of fine grains (10-15 nm) of an a-Fe(Si) phase within the amorphous matrix.…”

Section: Effect Of Partial Crystallization and Nanocrystallization Onmentioning

confidence: 61%

Processing magnetic microwires for magnetic bistability and magnetoimpedance

Zhukov

Ipatov

2015

Magnetic Nano- And Microwires

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Section: Effect Of Partial Crystallization and Nanocrystallization Onmentioning

confidence: 61%

Processing magnetic microwires for magnetic bistability and magnetoimpedance

Zhukov

Ipatov

2015

Magnetic Nano- And Microwires

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“…15 When the frequency continues to increase, the loss caused by the eddy damp enhances. 16,17 The magnetization caused by the magnetic domain motion gradually weakens until it completely disappears. It only has the magnetization caused by the rotation of the magnetic moment, so the magnetic permeability decreases, and the maximum impedance ratio reduces with frequency increasing.…”

Section: Results and Analysismentioning

confidence: 99%

Magnetoimpedance effect of the Ni80Fe20/Cu composite wires: The influence of DC current imposed on the Cu base

Chen

et al. 2014

AIP Advances

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In this paper, the copper composite wires of 75 μm in diameter with a sputtered layer of Ni80Fe20 permalloy were prepared, with a DC current applied to the basal Cu terminals during the fabrication process. The influence of the DC current on the magnetic configuration and Magneto-Impedance (MI) effect was studied. The results indicate that both the current amplitude and actuation duration have significant effect on the magnetic properties of the Ni80Fe20 layer. With appropriate current applied, the induced magnetic field leads to a circumferential magnetic domain structure and reduces significantly the equivalent anisotropy field of Ni80Fe20 layer. Then, the GMI ratio of the composite wires was significantly increased. A maximum GMI of 194.8% can be reached when the current was fixed at 100 mA and the Ni80Fe20 thickness is 780 nm. If the Ni80Fe20 thickness is above 780 nm, the coercivity of the coating layer increases while the GMI ratio of the composite wire reduces, since the magnetic anisotropy of the Ni80Fe20 layer varies from circumferential to longitudinal. The results were explained combining the thermal and magnetic effects of current.

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“…It is known that various annealing regimes may considerably change the magnetic structure of glass‐coated wires . Joule annealing typically improves the magnetic softness and increases the MI sensitivity.…”

Section: Temperature Effects On the Off‐diagonal MI Response With Glamentioning

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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Optimization of the giant magnetoimpedance effect of Finemet-type microwires through the nanocrystallization

Cited by 38 publications

References 23 publications

Processing magnetic microwires for magnetic bistability and magnetoimpedance

Processing magnetic microwires for magnetic bistability and magnetoimpedance

Magnetoimpedance effect of the Ni80Fe20/Cu composite wires: The influence of DC current imposed on the Cu base

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

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