Magnetoimpedance in amorphous wires and multifunctional applications: from sensors to tunable artificial microwave materials

Panina, L.V.; Makhnovskiy, D. P.; Mohri, K.

doi:10.1016/j.jmmm.2003.12.1285

Cited by 50 publications

(22 citation statements)

References 32 publications

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“…The analysis is concerned with the calculation of the surface impedance tensor, 1,13,16,20,21 which relates the components of the electric and magnetic field at the sample surface. The surface impedance calculation is based on a solution of Maxwell equations for the electric and magnetic fields together with the Landau-Lifshitz equation.…”

Section: 23mentioning

confidence: 99%

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Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons

Buznikov

Kim

et al. 2005

Journal of Applied Physics

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The off-diagonal magnetoimpedance in field-annealed CoFeSiB amorphous ribbons was measured in the low-frequency range using a pickup coil wound around the sample. The asymmetric two-peak behavior of the field dependence of the off-diagonal impedance was observed. The asymmetry is attributed to the formation of a hard magnetic crystalline phase at the ribbon surface. The experimental results are interpreted in terms of the surface impedance tensor. It is assumed that the ribbon consists of an inner amorphous region and surface crystalline layers. The coupling between the crystalline and amorphous phases is described through an effective bias field. A qualitative agreement between the calculated dependences and experimental data is demonstrated. The results obtained may be useful for development of weak magnetic-field sensors.

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Section: 23mentioning

confidence: 99%

“…The experimental results are interpreted in terms of the field and frequency dependent surface impedance tensor. 1,13,16,20,21 It is assumed that the ribbon consists of an inner amorphous core and two outer crystalline layers. Neglecting a domain structure, the off-diagonal magnetoimpedance is calculated.…”

Section: Introductionmentioning

confidence: 99%

Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons

Buznikov

Kim

et al. 2005

Journal of Applied Physics

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“…In this case, all expressions for the electric and magnetic field remains the same, and the only difference is the change of the boundary condition (11) for the longitudinal magnetic field at the wire surface [24,25]. Moreover, in the framework of the present model the asymmetric impedance response due to the presence of the DC bias current may be calculated similar to the case of the Co-based amorphous wires [24][25][26]28,29]. To take into account the effect of the bias current the corresponding modification in Eq.…”

Section: Resultsmentioning

confidence: 88%

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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“…All measurements here presented were performed in the frequency range of 0.01-2 MHz, well below the ferromagnetic resonance observed in this kind of samples [32,33].…”

Section: Frequency Dependence Of Magnetoimpedance and Torsion-impedancementioning

confidence: 98%

Magnetoimpedance in soft magnetic amorphous and nanostructured wires

et al. 2011

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The surface impedance tensor approach has been used to review the impedance response in a variety of amorphous and nanocrystallized wires. An experimental study on the torsion annealing effect on the magnetoimpedance (MI) behaviour for positive and negative magnetostriction amorphous wires of FeSiB and CoSiB compositions, respectively, has been carried out. Moreover, the influence of the onset nanocrystallization on the MI behaviour in Finemet-type alloys, with particular attention focussed on the case that the wires are annealed under applied torsional stress, is also presented. The analysis of the MI and torsion-impedance (TI) effects allows us to compare the different magnetic characteristics observed in a variety of wires. Special attention is paid to new results of the off-diagonal MI huge responses of these ferromagnetic samples, which are also a very useful source of information on the magnetic properties of the wires.

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Magnetoimpedance in amorphous wires and multifunctional applications: from sensors to tunable artificial microwave materials

Cited by 50 publications

References 32 publications

Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons

Off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons

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

Magnetoimpedance in soft magnetic amorphous and nanostructured wires

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