Physical properties of nearly zero magnetostriction Co-rich glass-coated amorphous microwires
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Physical properties of nearly zero magnetostriction Co-rich glass-coated amorphous microwires A.F. Coben˜o Dept. de Electro´nica y Telecomunicaciones y Dept. de Fı´sica Aplicada I, Escuela Universitaria de Ingenierı´a Te´cnica Industrial, 20011, San Sebastia´n, Spain
A. Zhukov Dept. de Fı´sica de Materiales, Faculdad de Quı´mica, P.O. Box 1072, 20080, San Sebastia´n, Spain, and AmoTec LTD, Blvd. Dacia 15/78, Kishinev, Moldova
A.R. de Arellano-Lo´pez and F. Elı´as Dept. de Fı´sica de la Materia Condensada, Universidad de Sevilla, P.O. Box 1065, 41080 Sevilla, Spain
J.M. Blanco Dept. de Electro´nica y Telecomunicaciones y Dept. de Fı´sica Aplicada I, Escuela Universitaria de Ingenierı´a Te´cnica Industrial, 20011, San Sebastia´n, Spain
V. Larin AmoTec LTD, Blvd. Dacia 15/78, Kishinev, Moldova
J. Gonza´lez Dept. de Fı´sica de Materiales, Faculdad de Quı´mica, P.O. Box 1072, 20080, San Sebastia´n, Spain (Received 25 January 1999; accepted 30 June 1999)
Magnetic and mechanical properties of Co-rich amorphous microwires of nominal compositions (Co1−x Mnx)75Si10 B15 (0.08 < x < 0.11) and Co56.5Fe6.5Ni10B16Si11 with nearly zero magnetostriction constant have been studied. Drastic changes of the hysteresis loop with the decrease of x from rectangular to flat shape were observed at x < 0.1, while the Co56.5Fe6.5Ni10B16Si11 microwire showed rectangular hysteresis loops. Compositions with x 艌 0.1 have small but positive magnetostriction constant while negative s values have been observed at x 艋 0.09, indicating rectangular character of the hysteresis loop in samples with nearly zero and even for small negative s. External stress dependence of switching field, H*, showed an increase of H* with for samples with x ⳱ 0.11 and a decrease of H* with for x ⳱ 0.1. Besides, microwires of the same composition but with different dimensions showed different H*() dependencies.
I. INTRODUCTION
In the last few years the study of the magnetic properties of amorphous wires has been a topic of growing technological interest. These amorphous wires, typically around 125 m in diameter, are obtained by the so-called in-rotating-water quenching technique. Their main technological interest is related to the magnetic softness in nearly zero magnetostriction composition, magnetic bistability in nonzero magnetostriction compositions, and the GMI (giant magnetoimpedance) effect. These magnetic properties are of great interest in sensor applications. On the other hand, Taylor’s technique is a classical method to obtain tiny metallic wires (of the order of 3–30 m in diameter) covered by an insulating glass coating.1 This technique has proved to be quite useful to obtain a very broad spectrum of compositions for the J. Mater. Res., Vol. 14, No. 9, Sep 1999
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metallic nucleus, including continuous copper and iron microwire and magnetic wires.1–5 The first studies were mainly focused on the determination of the structure (x-ray diffraction, ele
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