D.A. Thompson
IEEE Transactions on Magnetics
In recent years there has been considerable interest1 in wire produced by subjecting cold-drawn Vicalloy to a schedule of stretching and twisting first developed by J. Wiegand2. 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 Preisach3 and Sixtus and Tonks4 in externally stressed wires. The central region of the wire is frozen in axial tension (∼80 Kg/mm2) 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.5 © 1979 IEEE
D.A. Thompson
IEEE Transactions on Magnetics
M.O. Thompson, T.K. Worthington, et al.
IEEE Transactions on Magnetics
T.K. Worthington, D.A. Thompson
IEEE Transactions on Magnetics
H. Chang, Y.S. Lin, et al.
IEEE Transactions on Magnetics