Giant magneto-impedance (GMI) in amorphous wire, single layer film and sandwich film

L.V. Panina, K. Mohri and T. Uchiyama

Physica A: Statistical Mechanics and its Applications, 1997, vol. 241, issue 1, 429-438

Abstract: We present a review on giant magneto-impedance (GMI) in amorphous wires, single layer films and sandwich films, in which the effects with sensitivity up to 120%/Oe, 8%/Oe and 50%/Oe, respectively, have been found at MHz frequencies, even for tiny samples of 0.1-1 mm in length. GMI utilizes the skin effect (or the inductive effect) at which both the skin depth and the transverse permeability can be controlled with an external applied filed. Consequently, GMI depends considerably upon a particular magnetic structure, a frequency range and an excitation method, varying which various types of GMI characteristics can be obtained: having a maximum or a minimum at zero external field, without a hysteresis or exhibiting a sharp bistable hysteresis, symmetrical or asymmetrical with respect to the fiels. The comparative analysis of GMI in a uniform material in the form of a single magnetic layer and a composite structure in the form of a sandwich film with the inner high conductive non-magnetic material is given as well, demonstrating that the sandwich structure can show an increase in GMI of about a factor of 10 over a single magnetic layer and the maximum GMI effect occurs at considerably lower frequencies than that for a single layer.

Keywords: Amorphous wire; Thin film; Sandwich film; Skin effect; Impedance; AC permeability (search for similar items in EconPapers)
Date: 1997
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:241:y:1997:i:1:p:429-438

DOI: 10.1016/S0378-4371(97)00120-9

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