Giant magneto-impedance and skin effect in CuBe/CoNiP composite wires

Liu, L.P.; Zhao, Zhenjie; Zhang, J.C.; Wu, Zhiming; Ruan, Juanfang; Wang, Q.J.; Yang, Xinliang

doi:10.1016/j.jmmm.2006.01.002

Cited by 18 publications

(5 citation statements)

References 21 publications

(23 reference statements)

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“…It follows from expressions (1) and ( 2) that the impedance of a magnetic conductor is again dependent on the effective susceptibility through the skin depth. The skin depth or current distribution in a magnetic layer electroplated on Cu (also called a magnetic tube) is slightly different from that of amorphous wires [14,20,30]. Both, Liu et al [14] and Sinnecker et al [20] found that the skin effect in the magnetic coating is strong even at very low frequencies, and in this frequency range, large MI changes can also be observed.…”

Section: Resultsmentioning

confidence: 99%

“…The skin depth or current distribution in a magnetic layer electroplated on Cu (also called a magnetic tube) is slightly different from that of amorphous wires [14,20,30]. Both, Liu et al [14] and Sinnecker et al [20] found that the skin effect in the magnetic coating is strong even at very low frequencies, and in this frequency range, large MI changes can also be observed. At very low frequencies, the current flows mainly in the Cu core.…”

Section: Resultsmentioning

confidence: 99%

“…As the frequency increases, the current density in the Cu wire decreases gradually and the current now flows mainly in the magnetic shell. It has been shown that even at very low frequencies, such as above 5 kHz, the current flows mainly in the magnetic layer [14,20,30]. Considering that the resistivity of the magnetic layer is larger than the resistivity of the Cu core, the measured resistance should be smaller at low frequencies and higher above the 5 kHz frequency range.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore some of the studies also focused on soft magnetic composite wires or microtubes. Beach et al [13], Liu et al [14], Atalay et al [15][16][17][18][19], Sinnecker et al [20], Li et al [21][22][23][24][25][26], Seet et al [27,28], Yi et al [29] and Usov et al [30] have all reported that large MI effects can be observed in permalloy electrodeposited onto a highly conductive wire. The MI effect was first studied by Beach et al [13] in an NiFe layer electroplated onto a BeCu wire.…”

Section: Introductionmentioning

confidence: 99%

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Effect of tensile stress on magnetoimpedance properties of CoNiFe/Cu wire

Bayri¹,

Kolat²,

Kaya³

et al. 2009

J. Phys. D: Appl. Phys.

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A Co20.5Ni40.5Fe39 magnetic film was electrodeposited onto a copper wire 50 µm in diameter. The magnetoimpedance (MI) effect, (ΔZ/Z)H(%) = ((Z(H) − Zmax)/Zmax) × 100, was measured in the Co20.5Ni40.5Fe39/Cu composite wire under varying tensile stresses up to 30 MPa. The results showed that large MI and stress impedance (SI) effects can be observed in the Co20.5Ni40.5Fe39/Cu composite wire. The MI curve at zero tensile stress shows a small split peak in the low-field region. With increasing applied tensile stress, single-peak behaviour of the MI effect is observed. The magnitude of the MI and SI effects decreases with increasing tensile stress, σ. The peak values of (ΔZ/Z)H(%) for the sample decrease from 265% at σ = 0 to 39% at σ = 30 MPa at 40 kHz ac driving-current frequency. The impedance of a sample under the effect of 25 MPa tensile stress at 40 kHz ac driving-current frequency showed variations of about 146%. It was also found that the frequency value, f*, where the maximum MI effect was observed as a function of driving-current frequency, increases with increasing tensile stress.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of tensile stress on magnetoimpedance properties of CoNiFe/Cu wire

Bayri¹,

Kolat²,

Kaya³

et al. 2009

J. Phys. D: Appl. Phys.

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“…But in sandwich structures the skin effect is weak at low frequency and the dependence of the current density in the film can be neglected. Liu et al, 24 have suggested that due to the electromagnetic interactions between layers in the composite films, strong eddy currents are induced in the magnetic layer this in turn provides GMI effect even at very low frequency, and significantly influenced by conducting wire diameter. The impedance calculations in these composite wires are done by assuming a helical anisotropy in the magnetic shell.…”

Section: Numerical Calculationsmentioning

confidence: 99%

Influence of Core-Wire on Giant Magnetoimpedance Effect in Electrodeposited Composite Wires

Vasam

Srinivas

2020

J. Electrochem. Soc.

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The effect of non-magnetic core wire diameter and conductivity on giant magnetoimpedance (GMI) in composite wires has been investigated. Microstructure, magnetic and magnetoimpedance (MI) properties of a Permalloy (Ni 80 Fe 20 ) films electrodeposited on Cu, Ag and Nichrome wires have been investigated. Present results show that the magnitude of MI varies (from 611% to 31%) with both core-wire diameter (0.1 mm to 1.17 mm) and conductivity. Maximum MI (∼700%) and sensitivity (∼40%/Oe) is observed at 50 kHz for the NiFe film deposited on 100 μm Ag wire. The frequency (f max ) at which maximum in MI is observed depends on the effective conductivity of the wire. Further, from the model calculation we have shown that the skin depth (δ) at f max increases with the increase in core wire diameter of the composite wire and this in turn related to GMI. Therefore, from the present study we conclude that the MI parameters, such as, field sensitivity, MI and f max can also be tuned by choosing a suitable core-wire. These observations are in agreement with the results obtained from the numerical simulations.

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