Field-dependent surface impedance tensor in amorphous wires with two types of magnetic anisotropy: helical and circumferential
By D. Makhnovskiy, Larissa V. Panina, D. Mapps. 2001
234 citations recorded by the source corpus.
This paper concerns the theoretical and experimental investigation of the magneto-impedance (MI) effect in amorphous wires in terms of the surface impedance tensor Ϛˆ . Physical concepts of MI and problems of significant practical importance are discussed using the results obtained. The theoretical analysis is based on employing the asymptotic-series expansion method of solving the Maxwell equations for a ferromagnetic wire with an ac permeability tensor of a general form associated with magnetisation rotation. The magnetic structure-dependent impedance tensor Ϛˆ is calculated for any frequency and external magnetic field, and is not restricted to the case when only strong skin-effect is present. This approach allows us to develop a rigorous quantitative analysis of MI characteristics in wires, depending on the type of magnetic anisotropy, the magnitude of dc bias current, and an excitation method. The theoretical model has been tested by comparing the obtained results with experiment. For the sake of an adequate comparison, the full tensor Ϛˆ is measured in CoFeSiB and CoSiB amorphous wires having a circumferentia l and helical anisotropy, respectively, by determining the 21 S parameter. In cases, when the rotational dynamics is responsible for the impedance behaviour, there is a reasonable agreement between the experimental and theoretical results. Such effects as the ac biased asymmetrical MI in wires with a circumferential anisotropy, the transformation in MI behaviour caused by a dc current (from that having a symmetric hysteresis to an asymmetric anhysteretic one) in wires with a helical anisotropy are discussed.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/1172af439843a0c8b79e68f23dbf69be5a3babe3
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In Atomic and Molecular Physics, and Optics
In Electronic, Optical and Magnetic Materials
In Mechanical Engineering
Citations in the corpus
- Giant magnetoimpedance materials: Fundamentals and applications (2008, background): “Asymmetrical GMI due to ac bias field When a Co-based amorphous wire is subjected to a pulse helical magnetic field produced by the conjunction of an ac pulse current passing through the wire and a coil wound around it, asymmetry in the GMI profile can be produced [131,232,233].”