Theory of giant magneto-impedance effect in composite amorphous wire

Usov, N. A.; Антонов, А. С.; Granovsky, A.B.

doi:10.1016/s0304-8853(97)00033-4

Cited by 47 publications

(26 citation statements)

References 9 publications

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“…17,18) The room temperature conductivity of Ti ( ¼ 2:26 Â 10 6 À1 m À1 ) is smaller than that of Cu ( ¼ 5:81 Â 10 7 À1 m À1 ). Choosing Ti as the inner core is helpful to understand the influence extent of the inner core conductivity upon the GMI effect in plated wires.…”

Section: )mentioning

confidence: 99%

“…It confirmed the previous suggestion that large conductivity difference between magnetic layer and nonmagnetic core -metal in plated wires favors the GMI effect. 17,18) For plated wires Ti/CoP with thin CoP layer, the ðÁZ=Z 0 Þ max increases with increasing CoP thickness. Similar experimental results was observed in Cu/CoP plated wires (D ¼ 4{7 mm).…”

Section: )mentioning

confidence: 99%

“…Besides of the uniform wires, ribbons and films, [3][4][5][6][7][8] this effect has been observed in inhomogeneous structured materials such as non -magnetic conducting wire plated with magnetic layers and some sandwich films. [9][10][11][12][13][14][15][16][17][18] Large GMI effect occurs at a relative low frequency in BeCu/NiFe, 9) BeCu/CoFeNi, 10) Ag/NiFe 11) and Cu/CoP 12,13) plated wires. Most of previous published papers treated magnetoimpedance on plated wires with a constant magnetic thickness.…”

Section: Introductionmentioning

confidence: 99%

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Giant Magnetoimpedance in Ti/CoP Plated Wires

Qin

Zhang

et al. 2004

Mater. Trans.

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The giant magnetoimpedance in Ti/CoP plated wires with various CoP thickness was investigated. There is an optimal thickness of CoP magnetic layer for obtaining a large magnetoimpedance. The frequency f Z where the maximum magnetoimpedance ðÁZ=Z 0 Þ max occurs, shifts to low frequency with an increase of CoP thickness. Such shift is correlated with the reduction of the effective critical frequency of skin effect, accompanying the increase of magnetic layer thickness. The magnetic anisotropy field H K for Ti/CoP composite wires depends not only on the radial distance of CoP from the axis of the wire, but also on the CoP thickness.

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Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Giant Magnetoimpedance in Ti/CoP Plated Wires

Qin

Zhang

et al. 2004

Mater. Trans.

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“…These wires consist of a highly conductive non-magnetic inner core (typically copper) and a soft magnetic shell and are fabricated by means of the electroplating, electrodeposition or cold-drawn technique. Experimental studies and theoretical estimations [17,18] have demonstrated that the presence of the highly conductive inner core in the composite wires results in a significant increase of the GMI effect. Moreover, the composite wires have some other advantages in comparison with amorphous wires, in particular, an arbitrary choice of the materials for the shell and core, a relatively simple fabrication technology and a possibility of use a highamplitude AC current.…”

Section: Introductionmentioning

confidence: 99%

“…[17,18] for the composite wires having the longitudinal anisotropy in the magnetic shell. These models explain quite well some experimental results on the GMI effect in the composite wires [18].…”

Section: Introductionmentioning

confidence: 99%

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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