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GMI Effect in Amorphous Glass Covered Microwires as a Function of the Internal Induced Stresses | IEEE Journals & Magazine | IEEE Xplore

GMI Effect in Amorphous Glass Covered Microwires as a Function of the Internal Induced Stresses


Abstract:

The influence of the microwires diameter on the GMI effect, which consists of a significant change in the impedance of a piece of soft magnetic material driven by a high-...Show More

Abstract:

The influence of the microwires diameter on the GMI effect, which consists of a significant change in the impedance of a piece of soft magnetic material driven by a high-frequency current when it is introduced into a static magnetic field, in CoFeSiB nearly zero magnetostrictive glass covered wires is presented. The largest GMI effect is obtained for microwires having the metallic core diameter of about 20 mum. The experimental results are discussed considering the calculated magnetic anisotropies induced by mechanical stresses. The GMI dependence on the longitudinal magnetic field is changing both the shape, from a double peak-like to a single-peak like curve, and the magnitude. The suitable combination metallic core diameter-glass cover thickness results, over the control of the internal stresses distribution, into an optimum GMI response
Published in: IEEE Transactions on Magnetics ( Volume: 42, Issue: 10, October 2006)
Page(s): 3359 - 3361
Date of Publication: 25 September 2006

ISSN Information:


I. Introduction

The GMI effect consists of a significant change in the impedance of a piece of soft magnetic material driven by a high frequency current when it is introduced into a static magnetic field [1]. The magnitude of the effect is very large in amorphous magnetic wires, either obtained by in rotating water quenching or glass-coating technique [2], [3]. In glass-covered microwires, the GMI effect depends on the ratio of the metallic inner core to the total diameter of the microwire [4]. From a large number of experiments, we have observed that the magnitude of the GMI effect is strongly dependent on the diameter of the metallic core, and subsequently, on the glass cover thickness.

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