Modelling Of Domain Structure And Anisotropy In Glass-covered Amorphous Wires

Ménard, David; Frankland, D.; Ciureanu, P.; Yelon, A.; Rouabhi, M.; Cochrane, R. W.; Óvári, T.-A.; Chiriac, H.

doi:10.1109/intmag.1998.737244

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2000

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“…The former results from the strong shape anisotropy in a thin cylindrical wire and latter arises from large residual stresses at the surface due to the glass coating. A core-shell model has been effective in the treatment of MI in these types of wires [8][9][10] . The region of the wire sampled by the RF current decreases as the frequency increases and this is related by the well-known expression for skin-depth, given in equation (3).…”

Section: Resultsmentioning

confidence: 99%

Magneto-impedance of glass-coated Fe–Ni–Cu microwires

Wiggins

Srikanth

Wang

et al. 2000

Journal of Applied Physics

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The magneto-impedance (MI) of glass-coated Fe-Ni-Cu microwires was investigated for longitudinal radio-frequency (RF) currents up to a frequency of 200 MHz using an RF lock-in amplifier method. The MI, defined as ∆Z/Z = [Z(H)-Z(H=0.3T)]/Z(H=0.3T), displays a peak structure (negative MI) at zero field for RF currents with frequencies less than 20MHz and this crosses over to a sharp dip (positive MI) at higher frequencies. This crossover behavior is ascribed to the skin-depth-limited response primarily governed by the field-dependence of the permeability. Large saturation fields (300 to 600 Oe) and other anomalies indicate the possible influence of giant magneto-resistance (GMR) on the MI. a) Corresponding

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Section: Resultsmentioning

confidence: 99%