Anisotropic behaviour of permalloy wires using the giant magnetoimpedance effect

Magnetoimpedance spectra of soft magnetic wires are characterized by peaks of the real part of the impedance at frequencies f(0) which increase with the strength of the applied field, H-0. In the high-field region, f(0)(2) varies linearly with H-0 with a slope that depends on the saturation magnetization and the gyromagnetic ratio; in the low-held region, the plot f(0)(2)-H-0 shows a near-zero intercept at H-0 = H-K. Given the gyromagnetic ratio, both the saturation magnetization and the anisotropy held can be determined from the variation of f(0)(2) vs. H-0. (C) 1999 Elsevier Science B.V. All rights reserved.