Giant magneto-impedance in heterogeneous microwires
Recent results concerning the giant magneto-impedance effect, GMI, in magnetic microwires having diameter in the range of a few micrometers and heterogeneous character are introduced in this work. Two types of microwires have been studied, namely, (i) magnetic microwires covered by insulating Pyrex glass coating and (ii) copper wires covered by electrodeposited magnetic microtubes. The magnetic anisotropy distribution in each type of microwire is correlated with giant magneto-impedance. While the main source of anisotropy in glass coated microwires is of magnetoelastic origin created by the stresses induced during quenching and by the coating, in the case of the microtubes the origin is the columnar growth during the electrodeposition. The influence on GMI of various treatments that modify the anisotropy is analyzed. Heterogeneous microwires with different thicknesses of insulating coating and of magnetic tube are analyzed.
GMI Effect in Amorphous Glass Covered Microwires as a Function of the Internal Induced Stresses
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
Modern Lexicography: An Introduction
Chapter 1: Dictionaries and the Dictionary Chapter 2: The Lexicographical Scene of English-Speaking Countries Chapter 3: The Historical Origins of the General-Purpose Dictionary Chapter 4: General-Purpose Dictionaries and Society Chapter 5: What are General-Purpose Dictionaries Really For? Chapter 6: The Linguistic Traditions ofr Lexicography Chapter 7: Whither Lexicography? Conclusion