Influence of magnetostriction on magneto-impedance in amorphous soft ferromagnetic wires

Journal Article · Wed Mar 01 04:00:00 EST 1995 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.364816· OSTI ID:37157

Costa-Kraemer, J L; Rao, K V ^[1]

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1. Royal Inst. of Technology, Stockholm (Sweden). Dept. of Condensed Matter Physics

Very large changes are observed in the impedance of a (Co{sub 94}Fe{sub 6}){sub 72.5}Si{sub 12.5}B{sub 15} soft ferromagnetic wire in the presence of axial fields of the order of 1 Oe. Changes of the impedance of 200% or more have been reported at axial field values less than 1 Oe in soft nearly zero magnetostrictive Co-based amorphous wires with induced circumferential anisotropies. In this work the effect of different small saturation magnetostriction constants and induced circumferential anisotropies on the magnetoimpedance for various annealed wires is studied. During current annealing a circumferential anisotropy is induced. Also, the saturation magnetostriction constant changes continuously from a small negative ({minus}7{times}10{sup {minus}8}) to a small positive value (+6 {times}10{sup {minus}8}) depending on the current amplitude. The impedance as a function of current, frequency and dc axial magnetic field is measured for these wires. All of the wires exhibit a sharp threshold of the impedance when subjected to axial fields less than 1 Oe. Changes in the impedance, {Delta}V/V=(V(H)-V(0))/V(0), of the order of 200% with maximum slopes reaching up to 1700 %/Oe are measured in this series. The role of the saturation magnetostriction constant and the induced circumferential anisotropy in the observed magneto-impedance is discussed.

• OSTI ID: 37157
• Report Number(s): CONF-9406307--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 2 Vol. 31; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
COBALT BASE ALLOYS
IMPEDANCE
IRON ALLOYS
MAGNETIC FIELDS
MAGNETOSTRICTION
SILICON ALLOYS
WIRES