Publication
IEEE Transactions on Magnetics
Paper

Switching beravior of stressed Vicalloy wire

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Abstract

In recent years there has been considerable interest<sup>1</sup> in wire produced by subjecting cold-drawn Vicalloy to a schedule of stretching and twisting first developed by J. Wiegand<sup>2</sup>. Magnetization reversal in this wire occurs by a single giant Barkhausen jump, leading to a number of sensor-based applications. We show that the unusual switching behavior is due to a nearly perfect single magnetic domain running the length of the wire. This condition results from a doubly helical residual stress pattern (see figure) built into the wire by the twisting process. This stress is extremely large, causing a single-domain behavior first noted by Preisach<sup>3</sup> and Sixtus and Tonks<sup>4</sup> in externally stressed wires. The central region of the wire is frozen in axial tension (∼80 Kg/mm<sup>2</sup>) and twist, whereas the outer region is in compression and twist of opposite chirality. This model accounts for all of the observed properties of this wire.<sup>5</sup> © 1979 IEEE

Date

01 Jan 1979

Publication

IEEE Transactions on Magnetics

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